Event D is one of six palaeoseismic events identified in the Tekieh trench system which intersects the Serghaya Fault in the southern Zebadani Valley of Syria. The event was recognized in a trench system excavated across and parallel to a ~4–4.5 m-high fault scarp where Late Pleistocene lacustrine sediments on the upthrown eastern block are juxtaposed against Holocene alluvial deposits on the downthrown western block. Event D is represented by Wedge 3, a colluvial wedge observed in Trench 1.
The fault at this location displays predominantly left-lateral strike-slip motion with a possibility of a smaller dip-slip component. Although displacement for Event D was not measured directly, approximately 4 m of left-lateral displacement is associated with the pair of earthquakes represented by Events D and E, implying an average displacement of roughly 2 m for each event.
Using Wells and Coppersmith (1994) slip-to-magnitude scaling relationships, Gomez et al. (2003) estimated that approximately 2 m of coseismic slip corresponds to an earthquake of about MW 7.0–7.2. Event D was therefore probably a large surface-rupturing earthquake of similar magnitude, although this estimate is inferred from average slip per event rather than from a direct displacement measurement.
Event D post-dates Event E which was dated to 4460-3250 BCE (2σ) and pre-dates Channel C2 which was dated to 1690–1400 BCE. This brackets the age of Event D to between 4460 and 1400 BCE.
- Fig. 2 Tectonic Location
Map from Gomez et al. (2003)
Shaded relief image depicting the gross morphology of the Serghaya fault. Faults and the main anticlinal hinges are shown. Geographic features:
- ZV = Zebadani Valley
- H = Mt Hermon
- D = Damascus
- B = Baalbek
- A = Aarsal
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Gomez et al (2003)- Fig. 3 Geologic Location
Map from Gomez et al. (2003)
Geology of the southern Zebadani Valley (Syria). See Fig. 2 for location. Stereonet depicts fault planes and associated striations from faulted Late Pleistocene lake sediments. The dotted line depicts the catchment for the hillslope drainage at the trench site (white square). The white star denotes the excavation of the upper colluvial wedge described in Gomez et al# (2001). White discs denote small drainage deflections (values in metres), including the example shown in Fig. 4. Topographic contour interval = 50 m.
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Gomez et al (2003)- Fig. 5a Detailed Location
Map from Gomez et al. (2003)
Map of trench site. 1 m relative contours are based on mapping with a total station
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Gomez et al (2003)- Fig. 5c Extremely Detailed Location
Map from Gomez et al. (2003)
Enlarged map of the trench site depicting the positions of the present channel (C1) and the precise locations of the buried channels (C2 and C3). Solid black lines indicate where the buried channels were observed and dashed lines indicate where buried channels were inferred. The patterns are consistent with Fig. 5(a).
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Gomez et al (2003)- Fig. 12 3D Drawing of Trenches 1 and 2
from Gomez et al. (2003)
Schematic block diagram illustrating the 3-D relationships of the features exposed in the trenches. A stratigraphic tie between the filling deposit of Channel C2 with the down-slope equivalent of Wedge 4 can be observed.
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Gomez et al (2003)Figure 8
Trench log for the northern wall of Trench 1 (see Fig. 7), exposing colluvial wedges, undifferentiated alluvium and Late Pleistocene lake sediments. Calibrated radiocarbon ages are shown.
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Gomez et al. (2003)
Figure 10
Trench log for the east wall of Trench 2. A sequence of three incised and filled channels is shown, with a northward sense of younging. Black discs denote the positions of samples for radiocarbon dating. The profile above the trench log depicts the hillslope channel morphology east of the fault zone. The relative positions of the channel mouth and the buried channels were mapped using a total station. Apparent offsets of the buried channels are shown.
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Gomez et al. (2003)
