Unit F3 Tsunami
Shtienberg et al. (2020) identified a
tsunamogenic deposit (Unit F3) at Dor, dated by
OSL dating
to between
9.91 and 9.29 ka. The poorly sorted sand layer, containing marine shells and
rip-up clasts
from underlying wetland deposits, indicates a powerful marine
inundation rather than a storm event. The authors estimated that the
tsunami had a run-up
of at least ~16 m, possibly as high as 40 m, and
traveled inland between 1.5 and 3.5 km from the early Holocene
palaeo-shoreline. At the time of deposition, global sea level was 40–16 m below present,
placing the shoreline considerably farther seaward. To carry marine
shells into a contemporaneous fresh-to-brackish wetland, the wave front
must have advanced well inland, implying exceptional energy.
Shtienberg et al. (2020) interpreted this event as one of the largest known
Holocene tsunamis documented along the Levant coast, far exceeding the
run-up distances of later, well-recorded events.
They proposed that the tsunami was generated by a
submarine landslide in the “Dor complex,” located about 16 km west of
Tel Dor. They noted that the landslide could have been caused by seismic shaking
due to an earthquake along the Carmel Fault and might be analagous to a ca. 10 ka
earthquake identified in damaged speleothems by
Agnon et al. (2009) "from a cave in the nearby Carmel ridge."