Starting with the chronology issue, from Epitome we learn that the great earthquake happened after AD 723/724 but certainly before the death of A’sam (AD 742/743) as it derived
from another passage: “A’sam understood that this great calamity was due to the wrath of
God and let the Higher Priests alone causing them no further harm”. No large earthquakes
were dated in the eastern Mediterranean in the early period of that time interval. On the
contrary, it is likely that more than one earthquakes occurred in the late period of that interval and beyond up to around AD 757. However, the many different dating systems used in
the various documentary sources complicates the earthquake dating issue, thus the date
of the great earthquake falls in the range from AD 737/738 up to 757/758. From detailed
historiographic analysis, Guidoboni et al. (1994) suggested that the great earthquake of
that period occurred in the morning of AD 18 January 749, which was also supported by
Nur and Burgess (2008), on the basis of archaeoseismological interpretation, and adopted
by Papadopoulos et al. (2014) and Papadopoulos (2016). An important archaeological discovery is the clear evidence of a powerful earthquake that affected the city of Ramla, to the
west of Jerusalem, and dated by firm ceramic evidence around AD 749 (Gorzalczany and
Salamon 2018). On the other hand, Karcz (2004), Ambraseys (2005, 2009) and Salamon
et al. (2007), based mainly on the Chronography by the Byzantine Theophanes, which is
the source nearest to the events, preferred AD 18 January 746 or 747. Other important
earthquake events were dated in AD 749 or in AD 750 as well as on AD 9 March 757
(Karcz 2004; Ambraseys 2009).
Of interest is that the geometry, kinematics, and activity of the faults crossing the town
of Tiberias, studied through an integrated structural, archaeoseismological and geophysical approach, revealed that this fault segment was activated in the AD mid-eighth century
(Ferrario et al. 2020). Based on macroseismic information for an earthquake dated in AD
746, Riad et al. (2004) estimated maximum intensity as high as XI in Balqa, Jordan, and
magnitude 7.7, which was adopted by Sawires et al. (2016) too. El-Isa et al. (2015) suggested two major earthquakes occurring in AD 746/747 and in AD 748/749 with estimated
magnitudes 7.4 and 7.2, respectively. Zohar et al. (2017) placed the earthquake in 749/750
and suggested average magnitude of 7.2 as calculated from several previous estimates.