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Tiberias Introduction

Aerial Photo of Tiberias Ancient Tiberias

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Names

Transliterated Name Language Name
Tverya Hebrew טיבריות
Ṭabariyyā Arabic طبريا
Rakkath Biblical Hebrew (Joshua 19:35) רקבת
Chamath Ancient Israelite (Jewish tradition) חמת
Tiberiás Ancient Greek Τιβεριάς
Tiveriáda Modern Greek Τιβεριάδα
Tiberiás Latin Tiberiás
Tiberias English Tiberias
Introduction
Introduction

Tiberias was founded between 18 and 20 CE by Herod's son Herod Antipas, who made it the capital of his kingdom; the city was named after the Roman Emperor Tiberius. Its location, on the western shore of the Sea of Galilee was then to the south of present-day Tiberias and to the north of the hot springs known as Hammath; the city's western boundary was marked by Mount Berenice, which rises to an altitude of approximately 200m above the level of the Sea of Galilee (Stern et al, 1993). In the 3rd century CE, the ruling institutions of the Jewish people moved to Tiberias and Tiberias became the Jewish capital of Palestine and the diaspora. The majority of the Palestinian (aka Jerusalem) Talmud was composed there (Stern et al, 1993). The city began to decline and moved north to present day Tiberais in the 9th and 10th centuries (Stern et al, 1993).

Identification

Tiberias was founded between 18 and 20 CE by Herod's son Herod Antipas, who made it the capital of his kingdom; the city was named after the emperor Tiberius. Its location, on the western shore of the Sea of Galilee (map reference 201.242) was then to the south of present-day Tiberias and to the north of the hot springs known as Hammath; the city's western boundary was marked by Mount Berenice, which rises to an altitude of approximately 200 m above the level of the Sea of Galilee.

History

Stern et al (1993 v. 4)

Josephus states that Tiberias was located "in the best region of Galilee." In order to populate the city as quickly as possible, the king attracted residents "by equipping houses at his own expense and adding new gifts of land" (Antiq. XVIII, 36-38). Coins issued in honor of the founding of the city feature the reed plants indigenous to the shores of the Sea of Galilee; later coins, minted toward the end of the Second Temple period, bear a palm tree, symbolizing the city's prosperity.

According to Josephus, the royal palace was a magnificent building, that was decorated with "representations of animals," and whose ceilings were "partly of gold" (Life 65-66). The royal treasure houses and archives were also here, at least until61 CE when Tiberias lost its role as the capital (Life 38). Josephus also mentions a synagogue, which was "a huge building, capable of accommodating a large crowd" (Life 277). After the death of Herod Anti pas' successor, Agrippa I ( 44CE), Tiberias came under the authority of the Roman procurators of Judea. The town maintained its position as the capital of Galilee without interruption until 61, when it was annexed to the kingdom of Agrippa II (Life 37-38), whose capital was at Caesarea-Philippi (modern Banias). As Agrippa's sister Berenice ruled at his side in Banias, the popular tradition linking her name to the mountain and aqueduct in Tiberias has no historical basis. At the outbreak of the First Jewish Revolt against Rome in 66, Tiberias was fortified with walls that remained standing even after the city had surrendered to the Roman army (War II, 572-573; III, 460-461).

Tiberias continued to be part of Agrippa II's kingdom, probably until his death in about 96. Then the town came under direct Roman rule and enjoyed the prosperity characteristic of the Roman Empire. During Hadrian's reign, a temple was built in his honor (the Hadrianeum, "a very great temple" according to Epiphanius, H aer. 30, 12). Its four-columned facade is depicted on a series of coins minted at Tiberias in 119. In the mid-second century the city, previously considered unclean because of the many old graves in it, was purified by Rabbi Simeon Bar Yohai (Gen. Rab. 79h; J.T., Shah. 9, l-38d).

During the reign of Emperor Elagabalus (218-222), Tiberias was granted the status of a Roman colony, as it appears from coins (B.T., A.Z. lOa). It was then that the ruling institutions of the Jewish people were moved from Sepphoris to Tiberias: first (c. 235) the Sanhedrin, with Rabbi Yohanan at its head, then the Patriarchate, and the then reigning patriarch, Rabbi Judah II Nesiah (d. c. 270). Yohanan established the Great Study House (beth ha midrash ha-gadol). In this institution, frequently mentioned in Talmudic literature, the great majority of the Palestinian (Jerusalem) Talmud was written.

After Tiberias became the Jewish capital of Palestine and the Diaspora, it continued to prosper for a considerable time. The sources refer to the city gate and to the fortress, which was probably built on the site of the royal palace from Second Temple times. Mention is also made of the boule (municipal council), various synagogues, study houses, city markets, and a series of public buildings-a stadium, bathhouse, lavatory, and magnificent tombs. Near these were the residential quarters of the city and various industrial areas, which included, inter alia, glassworks and pottery workshops. South of Tiberias, in the vicinity of the hot springs, Hammath-Tiberias (q.v.) developed as a suburb serving the numerous visitors who came from far and near to the medicinal springs.

In the sixth century, the Academy (Yeshiva) of Bretz-Israel, which succeeded the Sanhedrin as the supreme religious institution of the Jewish people, was established in Tiberias. The academy continued its activities here long after the Arab occupation, probably until the tenth century. During that time-the period of the Gaonim-several schools of poets and preachers were active in Tiberias, as were scribes and vocalizers (the Masoretes), whose system of vocalization, still in use today, is known as the Tiberian system.

After the Arab invasion, Tiberias superseded Beth-Shean as the capital of northern Palestine. The city continued to prosper until the ninth century. In the tenth century, however, security in the area began to deteriorate and the population declined. In 1033, Tiberias was destroyed by an earthquake; in the Crusader period, it was moved to the north, to its present location. Since then, most of the area of ancient Tiberias has remained desolate.

History of Tiberias until the arrival of the Crusaders

The foundation date of Tiberias is not certain. Named after Tiberius (reigned 14–37 CE), it is believed to have been founded by Herod Antipas, son of Herod the Great, as his capital some-time between 18 and 20. In 39 Antipas’s nephew, Agrippa I, gained control over the city and ruled it up to his death in 44 CE. Until 61 CE it was ruled by the procurators, when its political status changed when it was annexed to the kingdom of Agrippa II, whose capital was at Banias. In about 100 CE it came under direct Roman rule. During Hadrian’s reign (117–138 CE) there commenced the erection of a temple in his honor in the middle of the city, which, however, was never finished.

In the third century, Tiberias flourished: not only was it granted the status of a Roman colony (under Elagabalus [reigned 218–222 CE]), but also it became the capital of the Jewish people, after the Sanhedrin, the Patriarchate, and the leader of the community all had moved there from Sepphoris. Rabbi Yohanan, head of the Sanhedrin, established the bet ha-midrash ha-gadol, where the Palestinian Talmud was mostly written. From the sixth century on, Yeshivat Eretz Israel, the supreme religious institution for the Jews in Palestine and the Diaspora, was active in Tiberias, at least until the tenth century (of note is the fact that the Aleppo Codex was compiled in Tiberias at this time), when it finally moved to Jerusalem. Even then, Tiberias continued to serve as a center for the Masoretes, who dealt with the correct vocalization of the Holy Scriptures, for Hebrew grammarians, as well as for poets and preachers.

The prominent Jewish character of Tiberias might have been the main reason the Christian community did not take off, at least until the fifth century.2 Yet, despite the slow penetration of Christianity into Tiberias, we know that by the mid-fifth century it is already a seat of a bishopric, as its bishop (John) is mentioned in the lists of the Council of Chalcedon (451 CE).3

Tabariyya, as it is named in Arabic, was conquered by Arab armies in 635 CE. According to al-Baladhuri (d. c. 892)4, the terms of surrender guaranteed a smooth and peaceful change of government. Eventually Tabariyya was chosen to be the capital of Jund al-Urdunn, ultimately to the detriment of Baysān/Scythopolis, capital of Palaestina Secunda. It is not clear,nevertheless, when exactly this shift of capitals took place.

Three major earthquakes affected Tiberias during the Early Islamic period: 749 CE, 1033 CE, and 1068 CE. The first certainly caused much destruction, as we learn from the excavations at Galei Kinneret,5 but the earthquake was followed by renovation, building, and expansion. The earthquake of 1033, until recently thought to have brought Tiberias to an end, was not as dramatic for Tiberias. The account of the Persian traveler Nasir-i Khusraw of 1047 CE makes no reference to a devastated city, quite the opposite:6
The city has a strong wall that, beginning at the borders of the lake, goes all round the town; but on the water side there is no wall. There are numerous buildings erected in the very water, for the bed of the lake in this part is rock; and they have built pleasure-houses that are supported on columns of marble, rising up out of the water. The lake is full of fish.
Nasir-i Khusraw goes on, describing the Friday Mosque in the middle of the town, as well as another one called Jasmine Mosque, on the western side of the city.

In addition to natural disasters, Islamic Tiberias was hit by invasions and sacking. In 906 CE the Ismaili Qarmatis, fighting against the Tulunids for the leadership of Syria, captured Tiberias, a major army base at the time. The sources tell that, following the resistance of its people, the city was plundered, women taken captive, and many people killed7. The eleventh century was even harder for Tiberians, as in general for the people of Palestine. Even before the earthquake of 1033 CE8, drought and unrest had struck the region. The Banu Jarrah Bedouin caused much instability. In August 1024 CE, their leader al-Hassan b. al-Mufarrij sacked Tiberias and killed its people mercilessly.9

Not withstanding the unrest, southern Syria under the Fatimids — and especially its two capitals, Ramla and Tiberias — witnessed a golden age. Much building and commercial, cultural, and religious activities took place. But toward the 1050s–1060s, the situation changed again, this time creating a political vacuum from which it was dfficult to recover. Jewish letters found in the Geniza are testimony to the stress under which the population of Syria lived.10 This situation, among others, made room for the Seljuq invasion of the 1070s, when Tiberias was made the Seljuq base against the Fatimids.11

In August 1098, the Fatimids managed to regain Jerusalem from the Seljuq Turks, putting an end to their rule over Palestine. Yet the Fatimids’ hold was short, and in July 1099 Palestine fell into the hands of the Crusaders. The old city center of Tiberias became a quarry for building material to the newly established Crusader fortfication to the north of the city.12
Footnotes

2 The Panarion of Epiphanius (fourth century) includes a passage that seems representative of the Jewish sovereignty in Tiberias, despite being under Christian rule. The passage refers to Count (Comes) Joseph from Tiberias, a Jew converted to Christianity and protégée of Constantine (reigned 306–337 CE). He planned to build a church at the site of the unfinished Hadrianeum, but the local Jews often disrupted his works. So he eventually built a small church at the site of the temple, left the city, and settled in Beth She’an. See The Panarion of Epiphanius of Salamis (trans. F. Williams; Nag Hammadi Studies 35; Leiden: Brill, 1987), book 1, sections 1–46, §30.12,1–12,9.

3. R. Price and M. Gaddis, trans., The Acts of the Council of Chalcedon (Translated Texts for Historians 45;Liverpool: Liverpool University Press, 2005), 1:360.

4. Ahmad ibn Yahyā ibn Jābir al-Balādhurī, Futūh al-buldān (Leiden: Brill, 1866), 115–16

5. License no. A-3607. Moshe Hartal, “Tiberias, Galei Kinneret,” HA-ESI 120 (2008)

6. Nāsir-i Khusraw, Safarnāma, ed., Yahyā al-Khashshāb (Beirut: Dār al-Kitāb al-Jadīd, 1983), 52.

7. Moshe Gil, A History of Palestine, 634–1099 (Cambridge: Cambridge University Press, 1997), §468.

8. A further earthquake, which took place in September 1015, is recorded by the sources, but apparently it was of little consequence, the main result being the collapse of the dome at the Dome of the Rock in Jerusalem. See ibid., §581. For the earthquake of 1033 and 1068, see ibid., §§595 and 602.

9. Ibid., §585.

10. Ibid., §596.

11. Ibid. §603.

12. On this fortfication, see Yosef Stepansky, “The Crusader Castle of Tiberias,” Crusades 3 (2004): 179–81.

History of Tiberias during the Ottoman Period

Tiberias was established in 19 CE by Herod Antipas who named it after the Roman emperor Tiberius. Like the rest of Palestine, during the next 1500 years it underwent Roman, Byzantine, Muslim, Crusader and Mamluk regimes (Avi-Yonah 1951, 1980, Gil 1983). In 1517 the Ottomans conquered Palestine and were mostly interested in subjecting Tiberias to the general governance of Damascus. Their interest was smartly manipulated by Dona Gracia, a wealthy Portuguese Jewess from Istanbul (Turkey) who used her influence and connections at the Sultan’s court to increase the Jewish population in the Galilee and to establish Tiberias as a Jewish centre. Ottoman Firmans (written permission) report that between June 1560 and December 1565 Dona Gracia had leased the collection of taxes in Tiberias and a few other villages in the region. The Firmans also imply that she was probably responsible for reconstruction of the surrounding walls of Tiberias in order to increase the security of the inhabitants (Roger 1646, De Aveiro 1927, Heyd 1966).

The prosperity of the Jewish community did not last long and sometime at the beginning of the seventeenth century the Jews were forced to leave due to Ottoman tyranny (Roger 1646, De Thévenot 1971). The turning point for Tiberias was the rule of Dahir al-Umar of the Bedouin Zaydan family. Close to the mid-eighteenth century he gained control of Tiberias and other Galilean regions and gradually accumulated massive power. His dominancy did not escape the eyes of Suleiman, the Pasha of Damascus, who decided to overthrow Dahir’s rule by besieging Tiberias three times: in 1738, 1742 and 1743. The first two sieges were failures and during the last attempt Suleiman died of an intestine illness (Bnayahu 1946, Heyd 1969, Nachshon 1980). The son of Dahir, Chulaybi, had fewer confrontations but, like his father, kept strengthening Tiberias and in 1750 also built a citadel on a hill at the northwest corner of the city (Hasselquist 1766). In October and November 1759, the walls and the Citadel were severely hit by two consecutive earthquakes (Ambraseys and Barazangi 1989, Ambraseys 2009), but were gradually restored towards the end of the nineteenth century (Mariti 1791).

In October 1831 the Egyptian Ibrahim Pasha invaded Palestine on his way north and in May 1833 he completed the conquest of Syria and Palestine. In 1834 another damaging earthquake struck Palestine but no damage to Tiberias or northern Palestine was reported (Ambraseys 2009). In the same year a Fellahin rebellion erupted in the mountainous areas of Bethlehem, Jerusalem, Nablus, Transjordan and northern Galilee. The rebels took over Tiberias for a short period but the Egyptians, with reinforcements from the south, eventually managed to gain back control of the city (Ben-Zvi 1954). From that year until the 1837 earthquake the city remained under Egyptian rule.

Exploration and Excavation

The remains of ancient Tiberias' walls were first examined by V. Guerin in 1875. A more detailed survey of the walls at the top of Mount Berenice was carried out by G. Schumacher in 1887. A systematic excavation of the southern gate and its vicinity was carried out by G. Foerster in 1973-1974, on behalf of the Israel Department of Antiquities and Museums, the Institute of Archaeology at the Hebrew University of Jerusalem, and the Israel Exploration Society. In addition, a great number of salvage excavations has been carried out. The largest, in both scale and results, was conducted in the center of the municipal area of the ancient city, under the direction of B. Rabani (1954- 1956). The excavators cleared a section of the city's central colonnaded street (its cardo), as well as a bathhouse and vaulted market. To the east, not far from the lake shore, A. Druks (1964-1968), uncovered the remains of a basilica! structure. When the excavations were extended to the south, along the shore, the remains of an exedra and various public buildings were revealed. In 1976, F. Vitto excavated a Roman tomb in Tiberias, and in 1989-1990 Y. Hirschfeld's salvage excavation at the foot of Mount Berenice exposed a Roman public building beneath the remains of private houses. Since 1990 Hirschfeld has been directing excavations on the summit of Mount Berenice.

The rapid development of modern Tiberias necessitated several salvage excavations in the southern part of the city. The remains of the Byzantine city wall and a large Crusader church were discovered by A. Harifin 1980, when foundations were dug for the Jordan River Hotel. Farther south, A. Berman, working in 1978-1979, had discovered the remains of a synagogue and private houses from the Byzantine and Early Arab periods.

Other salvage excavations in the area revealed the remains of churches and fortification systems from the Crusader period. Dozens of tombs were discovered in the area to the north and northwest of the Byzantine city wall, mainly on the slopes now occupied by modern Tiberias. The results of these salvage operations provide important data for a reconstruction of the city plan of Roman-Byzantine Tiberias.

List of studies with earthquake evidence

Location Studies Notes
Galei Kinneret Galei Kinneret Site is just south of what appears to be the Roman Stadium
Berniki Theatre
Water Reservoir
Southern Gate
Aviv Hotel
Site 7354
House of the Bronzes
Basilica
Gane Hammat
Mount Berineke

Maps, Aerial Views, Cross-Sections, Seismic Data, Tables, Illustrations, and Photos
Maps, Aerial Views, Cross-Sections, Seismic Data, Tables, Illustrations, and Photos

General Maps and Archaeological Maps

Normal Size

  • Fig. F Main archaeological sites of Tiberias from Cytryn-Silverman (2015)
  • Fig. 1 Map of Tiberias during the Roman period from Atrash (2010)
  • City plan of Tiberias from Stern et al (1993 v.4)
  • City center plan of Tiberias from Stern et al (1993 v.4)
  • City gate from Roman period Tiberias from Stern et al (1993 v.4)
  • City Plan and wall in the 6th century CE from Stern et al (1993 v.4)

Magnified

  • Fig. F Main archaeological sites of Tiberias from Cytryn-Silverman (2015)
  • Fig. 1 Map of Tiberias during the Roman period from Atrash (2010)
  • City plan of Tiberias from Stern et al (1993 v.4)
  • City Plan and wall in the 6th century CE from Stern et al (1993 v.4)

Aerial Views

  • Annotated Aerial View of Tiberias from BibleWalks.com
  • Fig. A - Aerial view of ancient Tiberias from Cytryn-Silverman (2015)
  • Ancient Tiberias in Google Earth
  • Ancient Tiberias on govmap.gov.il

Map of Excavation Sites

Legend/Key

Legend/Key to excavation sites

Stern et al (2008)

Map

Tiberias: map showing excavation sites

Stern et al (2008)

Geologic Maps, Cross-Sections, and Seismic Data

Geologic Maps, Cross-Sections, and Seismic Data

Normal Size

  • Fig. 4 Map of ancient Tiberias with inferred fault from Ferrario et al (2020)
  • Fig. 1b Quaternary faults around the Sea of Galilee and the Jordan Valley from Ferrario et al (2020)
  • Fig. 1c Simplified geologic map around the Sea of Galilee along with epicenters of MW > 4.0 events since 1970 from Ferrario et al (2020)
  • Fig. 10 Sketches of the shallow subsurface from Ferrario et al (2020)
  • Fig. 2b Morphotectonic map from Ferrario et al (2020)
  • Fig. 9 Interpreted Seismic lines from Ferrario et al (2020)
  • Fig. 8 Interpreted Seismic line run north of Tiberias Theater from Ferrario et al (2020)
  • Fig. 2a Site Map from Ferrario et al (2020)

Magnified

  • Fig. 1b Quaternary faults around the Sea of Galilee and the Jordan Valley from Ferrario et al (2020)
  • Fig. 2b Morphotectonic map from Ferrario et al (2020)
  • Fig. 9 Interpreted Seismic lines from Ferrario et al (2020)
  • Fig. 8 Interpreted Seismic line run north of Tiberias Theater from Ferrario et al (2020)
  • Fig. 2a Site Map from Ferrario et al (2020)

Geologic Map

Figure 2

Geological map of the study area compiled from Sneh (2008), and Bogoch and Sneh (2008) with an overlay of faults according to Schulman (1966), and with locations of the refraction profiles TB-1, TB-2 and TB-3 (Ezersky, 2008); R-1 and R-2 (Shtivelman, 1995) and profiles 1 and 2 for constructing cross sections.

Zaslavsky et al. (2009a)


Stratigraphic Table

Table 1

Stratigraphic table of the geological map of Tiberias

(Sneh, 2008)

Zaslavsky et al. (2009a)


Illustrations

  • Fig. 14 Proposed reconstruction of the ancient city of Tiberias from Hirschfeld and Galor (2007) and Atrash (2012)

Photos

  • Fig. E Roman cardo and overlaying street from Cytryn-Silverman (2015)

Chronology
Phasing

All of Tiberias

Stratum Period Date Notes
I Late Fatimid 11th century CE construction above the collapse caused by an earthquake (in 1033 CE?)
II Early Fatimid 9th - 10th centuries CE continued use of the street with shops.
III Abbasid 8th - 9th centuries CE a row of shops, the basilica building was renovated.
IV Byzantine–Umayyad 5th - 7th centuries CE the eastern wing was added to the basilica building; the paved street; destruction was caused by the earthquake in 749 CE.
V Late Roman 4th century CE construction of the basilica complex, as well as the city’s institutions, i. e., the bathhouse and the covered market place.
VI Roman 2nd - 3rd centuries CE establishment of the Hadrianeum in the second century CE (temple dedicated to Hadrian that was never completed) and industrial installations; the paving of the cardo and the city’s infrastructure.
VII Early Roman 1st century CE founding of Tiberias, construction of the palace with the marble floor on the shore of the Sea of Galilee, opus sectile, fresco.
VIII Hellenistic 1st - 2nd centuries BCE fragments of typical pottery vessels (fish plates, Megarian bowls).

Site Effect
Zaslavsky et al. (2009a) - Site Effect and Seismic Hazard Microzonation across the town of Tiberias

Notes from Zaslavsky et al. (2009a)

Abstract

To quantify the seismic hazard across the town of Tiberias we used a methodology in which horizontal-to-vertical spectral ratio from microtremor (the Nakamura’s technique) obtained on a dense measurement grid is utilized to assess the site-specific uniform acceleration spectra. This process of hazard assessment involves: a detailed mapping of the fundamental and other natural frequencies and amplitudes of H/V spectral ratios; compiling geological, geophysical and borehole data and integrating it with H/V observations to develop models of the subsurface at many sites across the study area. The subsurface model serves as an input for computing the expected Uniform Hazard Site-Specific Acceleration Response Spectra at the investigated sites. The final stage is generalizing the hazard by mapping zones that feature similar seismic hazard functions.

Microtremor measurements were carried out at 175 sites, which are characterized by amplification from 2 up to 8 in the frequency range 0.7-8 Hz. The receiver function, which is horizontal-to-vertical spectral ratio obtained from earthquakes (shear wave) confirms the results obtained from microtremor records at three acceleration locations.

H/V ratios, geological data and information from S-velocity refraction profiles enables construction of geological cross sections. Certain sharp differences in the H/V ratios have been interpreted as being associated with a subsurface discontinuity, i.e. fault.

By comparison of the Uniform Hazard Acceleration Spectra calculated for probability of exceedance of 10% during an exposure time of 50 years and a damping ratio of 5% at more the 50 sites and in consideration of the constructed subsurface models, we subjectively divided the study area into eleven zones. The linear spectra for eight zones significantly exceed the design spectra required in the same area by the current Israel Standard 413 (IS-413) in the period range 0.1-0.5 sec.

Methodology

In the present study we used a three-step process for evaluating site effects and estimating their influence on seismic ground motion (Zaslavsky et al., 2005). At the first step, we performed microtremor measurements on a dense spatial grid and H/V spectral ratios, from which we obtained a spatial distribution of the frequencies at which amplification is likely to occur and the expected level of amplification at those frequencies. H/V spectral ratios of S-waves, often known as receiver functions, generated by earthquakes and recorded at three accelerometer locations are considered in the analysis. At the second step, all available geological information, geophysical and well data are collected and incorporated as an aid to construct subsurface models for different sites within the investigated area. Finally, one-dimensional analytical models [JW: They used SHAKE] are used to predict site-specific acceleration response spectra from future earthquakes. The application of this methodology makes possible reliable assessment of disaster from different earthquakes, especially in the regions where big earthquakes present a long return period, but which exhibit a high seismic risk according to historical reports, population distribution and its socio-economic importance.

Geology

With the exception of the Upper Cretaceous rocks exposed in the structural highs of Poriya and Fuliya blocks, all the formations on the geological map are part of the Neogene. From bottom to top these are: the Miocene Hordos Fm. and the Lower Basalt; the Neogene Bira Fm., Gesher Fm. and the Cover Basalt. The investigated area is dissected by two normal fault systems: the WSW-ENE transversal system with the down throw to the north, and the SE-NW system of step-faults with the down throw to the northeast. The two transversal faults in the south are of a Neogene pre-Cover basalt age. They were rejuvenated in the Pleistocene. The NW trending step faults are of Pleistocene post-Cover Basalt age. Along the greater part of their traces they bring basalt against basalt. Only at the southeastern termination of two of them, where they abut against a transversal fault, Neogene sediments rise to the surface. Here the throw of the two step faults is the greatest. A fourth step-fault is inferred within the lake and parallel to its shore. A significant feature is the considerable vertical displacement at the NE corner of the titled block, a result of the cumulative effect of the two fault systems. In the Upper Pliocene, the site of the town and its lakeshore were structurally higher than Tel Maon in the west (Schulman, 1966). Schulman (1966) proposed Ron et al. (1984) supported that the middle to upper Miocene sediments and basalts underwent intensive deformation by horizontal shear in a compressive stress field which operated during the end of the Miocene and early Pliocene times.

Brief Review of Several Experimental Methods for Site Effect Assessment

S-Wave spectral ratio with respect to reference site

The most common technique for estimating site response is the standard (classic) spectral ratio procedure first introduced by Borcherdt (1970). This approach considers the ratio between the Fourier spectra of a seismogram recorded in the site of interest and the spectrum of a seismogram recorded at a reference site, which is usually the rock outcrop. This ratio can be considered as the transfer function between the bedrock and the surface assuming that the two recordings correspond to the same source, the same path effect and that the reference site has a negligible site effect. It is very difficult to implement all these assumptions in real conditions. First, in many cases we do not have a nearby bedrock site and therefore the condition that the path of the propagating seismic waves is the same is not fulfilled; second, it is known (e.g., Steidl et al., 1996, Zaslavsky et al., 2002) that weathered and cracked bedrock site exhibits a significant site effect, associated with frequency-selective ground motion amplification; third, there are many cases in Israel, when nearby bedrock outcrop is not the same rock at the base of the soil layer which is responsible for amplifying seismic waves amplitudes. It should also be noted that performing simultaneous measurements at two sites is often relatively costly. Nevertheless, when all the conditions are observed, this method maybe considered the most reliable estimate of the empirical transfer function of site. Many investigators used this method and evaluated site response functions from moderate to weak motion recording of earthquakes (Tucker and King, 1984; McGarr et al., 1991; Field et al., 1992; Liu et al., 1992; Carver and Hartzell, 1996; Hartzell et al., 1996; Steidl et al., 1996; Zaslavsky et al., 2000 and others).

Horizontal-to-vertical S-wave spectral ratio (Receiver Function)

In this technique applied by Lermo and Chávez-García (1993) the receiver function can be obtained from ratio between horizontal and vertical amplitude spectra computed at the same investigated site from S-waves, respectively. Receiver function was introduced by Langston (1979) to determine the velocity structure of the crust and upper mantle from P-waves of teleseisms. Langston made the assumption that the vertical component of motion is not influenced by the local structure, whereas the horizontal components, owing to the geological layering, contain the P to S conversion. In the spectral domain this corresponds to a simple division of the horizontal spectrum by the vertical. Many studies report that the frequency dependence of site response can thus be obtained from measurements made at only one station at the analysed site (Lermo and Chavez-Garcia 1994; Malagnini et al., 1996; Seekins, et al., 1996; Theodulidis et al., 1996; Castro et al. 1997; Yamazaki and Ansary, 1997; and others). Their results confirm the validity of the method to estimate S-wave site response. We obtained similar conclusion in our investigations (Zaslavsky et al., 2000). Nevertheless, the implementation of this approach still requires a rather frequent occurrence of earthquakes. This requirement becomes an obstacle in regions of low seismicity.

Microtremor spectral ratio with respect to reference site

Kagami et al. (1982) proposed that the ratio of the spectra of the horizontal ground motions of the microtremor at the investigated site to those of a reference site can be used as a measure of the site response function. This method can be successfully applied for long period microtremors with period ranging from 1.0 to 10 sec. When higher frequencies are of interest, the distance between the measured sites should not exceed few hundred meters. The reliability of this method depends on whether or not the simultaneously measured motions at each site are from the same source and propagation path. This technique is widely used for site response estimates (Lermo et al., 1988; Field et al., 1990, 1995; Rovelli et al., 1991; Dravinski et al., 1995, 2003; Gaull et al., 1995). However, experimental study of site effect by sediment-to-bedrock spectral ratio in urban and suburban regions can be successful only under particular circumstances, because microtremor would be influenced by local artificial sources generated by human activities which essentially change from place to place.

Horizontal-to-vertical microtremor spectral ratio

Nakamura (1989) proposed the hypothesis that site response function under low strain can be determined as the spectral ratio of the horizontal versus the vertical component (H/V) of motion observed at the same site. He hypothesized that the vertical component of microtremor is relatively unaffected by the unconsolidated near-surface layers. Hence, the site response is the spectral ratio between the horizontal component of microseisms and vertical component of microseisms recorded at the same location.

Many authors, among them Lermo and Chávez-García (1994), Seekins et al. (1996), Toshinawa et al. (1997), Chávez-García and Cuenca (1998), Enomoto et al. (2000), Shapira et al. (2001), Mucciarelli and Gallipoli (2004), Murphy and Eaton (2005), Maresca, (2006), show that the H/V spectral ratio technique can be a useful tool for the assessment of ground motion characteristics on soft sediments. However, other authors (for example, Bonilla et al., 1997; Horike et al., 2001; Satoh et al., 2001) conclude that whereas the predominant peak of H/V ratio is well correlated with the fundamental resonance frequency, the amplitude of this peak is not necessarily the amplification level as obtained from sediment-to-bedrock spectral ratio of earthquake records.

Conclusions

In the town of Tiberias, H/V measurements performed on urban noise have been used to quantify soil responses for evaluation of the site specific seismic hazard. Our conclusions may be summarized as follows:
  • The stability and reproducibility of measurements are confirmed by data from continuous measurements during several months as well as repeated measurements in different months and years which yield almost identical shapes of average spectral ratios obtained at the same site under the same conditions of measurements.

  • Comparison between the average H/V spectral ratios obtained from accelerograms of horizontal components and from microtremor recorded at the same site shows that an appropriate ensemble of carefully selected windows of microtremor provides estimations of site response which are similar to those obtained from seismic events.

  • Experimental estimation of the site response over Tiberias yields variation in the fundamental frequency in the range 0.7-7 Hz and H/V amplitude from 2 up to 8. Maps of the spatial distribution of the fundamental frequency and their associated H/V amplitude delineate potentially vulnerable sites. This information is useful for land use considerations in urban planning and for identifying sites which require in depth site investigations to better evaluate the seismic hazard.

  • Limited data on S-wave velocities and sediment thickness of the upper layers obtained from seismic refraction surveys used to calibrate the H/V spectral ratio with an analytical site response derived from a 1D subsurface model. It is also used to justify further H/V ratios utilization, by velocities extrapolation, to study other sites, away from refraction profiles and boreholes. A stochastic optimization algorithm is applied to calculate the layer thickness, yielding transfer functions to match in the best way the observed H/V curves, considering all resonance peaks. Two cross-sections in Tiberias illustrate the results of H/V analysis.

  • The microtremor measurements enable identifying discontinuity in the subsurface and locate faults. These are associated with significant change in fundamental frequency, amplitude and shape corresponding to both vertical displacement and change in the velocity profile. Some, but not all faults detected by H/V analysis are identified also by geological data.

  • Analytical models cross-checked with observed data were extrapolated over the study area and integrated into computations of the uniform site specific acceleration response spectra for a probability of exceedence of 10% during exposure time of 50 years and damping of 5%. The sites with common site effect characteristics were united into zones. In eight out of eleven selected zones the current Building Code IS-413 significantly underestimates the acceleration in the period range 0.1-0.6 sec.

  • Since 2000 when strong motion stations were installed in the Tiberias area, two local earthquakes that occurred in 2004 were recorded. Taking into account the complicated geology of the region, we strongly recommend deploying seismic stations for continuous recording weak earthquakes to validate and improve the subsurface models derived from microtremor analysis and contribute to seismic hazard assessment.

  • We should emphasize that calculated analytical transfer functions are associated with weak motions and linear behavior of soils. Non-linear characteristics of site in Tiberias are beyond the scope of this study. Nevertheless, based on the result presented above nonlinear site response can be determined by different mathematical models of soil nonlinearity, making use of the models developed for each zone. In that respect, the microzonation maps developed in this study are also relevant for the prediction of ground motions from earthquakes of high magnitudes.

Location Map

Figure 3

Location of the measurement sites in the study area. Numbers indicate the sites used as examples. TB-1, TB-2 and TB-3 - refraction survey profiles (Ezersky, 2008); R-1 and R-2 – refraction survey profiles (Schtivelman, 1995); TVR, TVR2 and POR – accelerometer locations; Profile1 and Profile2 – profiles for reconstructing subsurface structure.

Zaslavsky et al. (2009a)


Distribution of the fundamental resonance frequency

Figure 15

Distribution of the fundamental resonance frequency over Tiberias.

Zaslavsky et al. (2009a)


Distribution of amplitude associated with the fundamental frequency

Figure 16

Distribution of amplitude associated with the fundamental frequency

Zaslavsky et al. (2009a)


Well Descriptions

Table 2

Brief description of wells located in the Tiberias region

Zaslavsky et al. (2009a)


Geophysical and analytical models at points located along TB-3 refraction profile

Table 4

Geophysical and analytical models for calculating transfer functions at points located along TB-3 refraction profile

Zaslavsky et al. (2009a)


Geophysical and analytical models at points located along TB-1 refraction profile

Table 5

Geophysical and analytical models for calculating transfer function at sites located along refraction profile TB-1.

Zaslavsky et al. (2009a)


Geotechnical data obtained from refraction surveys

Table 6

Geotechnical data obtained from refraction surveys carried out in 1995 and 2008.

Zaslavsky et al. (2009a)


Soil-column model for sites along refraction profile TB2

Table 7

Soil-column model for sites along refraction profile TB2

Zaslavsky et al. (2009a)


Ranges of S-wave velocities for litho-stratigraphycal units

Table 10

Ranges of S-wave velocities for litho-stratigraphycal units represented in the study area and used in calculating site response.

Zaslavsky et al. (2009a)


Schematic geological NS cross section beneath profile 1

Figure 23

Schematic geological NS cross section beneath profile 1

Zaslavsky et al. (2009a)


Schematic geological EW cross section along profile 2

Figure 25

Schematic geological EW cross section along profile 2

Zaslavsky et al. (2009a)


Seismic microzoning map of Tiberias presenting zones of common site effect characteristics

Figure 27

Seismic microzoning map of Tiberias presenting zones of common site effect characteristics.

Zaslavsky et al. (2009a)


Table 11 - Soil column models for representative sites of zones, their transfer functions and spectral accelerations.

Notes and Further Reading
References

Bibliography from Stern et al (1993 v.4)

M. Avi-Yonah, IEJ I (1950-1951), 160-169

D. Ussishkin, ibid. 18 (1968), 45-46

B. Lifshitz, Euphrosyne n.s. 6 (1973-1974), 23-27

G. Foerster, RB 82 (1975), 105-109

id., Recherches Archeologiques en Israel 206-209

E. Ballhorn, Israel-Land and Nature 1 (1976), 151-153

A. Bruno\, BTS 192 (1977), 10-20

L. I. Levine, HUCA 49 (1978), 143-185

M. Ben-Dov, ASR, 157-159

N. Feig, ES/1 (1982), 110; S. Dar, ibid. 2 (1983), 103

id., IEJ33 (1983), 114-115

A. Harif, PEQ 116(1984), 103-109

J-F. Desclaux, MdB 38 (1985), 45-47

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S. Qedar, Israel Numismatic Journa/9 (1986-1987), 29-33

H. Dudman and E. Ballhorn, Tiberias, Jerusalem 1988

D. Stacey, BAlAS 8 (1988- 1989), 21-33

A. Cohen, ES/9 (1989-1990), 171

Y. Hirschfeld, ibid., 107-109

id., BAR 17/2 (1991), 44- 51

id., MdB 72 (1991), 21-23

BA 54 (1991), 170-171.

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M. Rosen-Ayalon, Art et archéologie islamiques en Palestine, Paris 2002, 84–89, 152–153; Z. S. Winogradov, The Aqueducts of Israel, Portsmouth, RI 2002, 295–304

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G. Bijovsky, International Numismatic Newsletter 34 (1999), 3

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Mount Berenice

Main publication

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Studies

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id., ESI 14 (1994), 33–37

16 (1997), 35–42 (with R. Ben-Arieh)

id., AJA 98 (1994), 512–513

id., Michmanim 8 (1995), 11*–12*

id., RB 106 (1999), 236–249

R. Ben-Arieh, BA 57 (1994), 134–137

id., ESI 14 (1994), 37–38

16 (1995), 41–42

R. Fishman-Duker, MdB 92 (1995), 38–39

M. Aviam, Galilee through the Centuries: Confluence and Cultures (Duke Judaic Studies Series 1

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U. Dotterweich, Ungentarien mit Kuppelförmiger Mündung aus Knidos (Knidos Studien 1), Möhnesee 1999.

The “House of the Bronzes” and Associated Remains

BAR 25/1 (1999), 18

G. Bijovsky, International Numismatic Newsletter 34 (1999), 3

L. Shulman, The Digging Stick 16/3 (1999), 10–11

J. Sudilovsky, BAR 25/6 (1999), 14

W. Watzman, Archaeology 52/2 (1999), 34

Y. Hirschfeld & O. Gutfeld, ESI 112 (2000), 15*–17*

F. Mebarki, MdB 125 (2000), 64.

Wikipedia pages

Tiberias



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