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Seismic refraction profiles between Cyprus and Israel and their interpretation J, M a k r i s r n s t i t u t e

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Four long seismic refraction profiles were shot in the Jordon‐Dead Sea‐Gulf of Elat graben and adjacent areas. From the arrival times of the Pg, Pn, and PmP phases, models of the crust and upper mantle were computed. The models show a crustal thickness of 30 km along the graben with a considerable thinning to the south along the Gulf of Elat. Between the Dead Sea, Red Sea, and the Mediterranean, the crust thickens, reaching a maximum thickness of 40 km west of the graben; but toward the Mediterranean, the crust thins rapidly to a thickness of 20 km while the overlying sediments thicken considerably. The results indicate an upper mantle upwelling in the graben area, connected to the Red Sea spreading mechanism, and the presence of a thin, possibly oceanic crust covered by a thick wedge of Mesozoic and Tertiary sediments underneath the Northern Negev of Israel and probably extending offshore to the Eastern Mediterranean.

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Abstract. A seismic refraotion experiment involving the use of 90BS and 11 portable seismic land stations was conducted along a profile in the north basin of the Dead Sea. The seismometers were deployed along a north-south profile in the lake and the adjacent land area. The interpretation of the recorded seismograms indicates the presence of two large Pliocene salt diapirs in the young basin fill. The basement lies at a relatively shallow depth (6-8 km) under the north basin. Further south along the profile a major fault affecting the basement was detected. The apparent sense of the faulting is down to the southeast, representing the boundary of the south basin. This major faulting with a downthrow of some 4-5 km has depressed the crystalline basement and the overlying Cretaceous and pre-Cretaceous sediments. The faulting was followed by the deposition of over 8 km of Recent and Tertiary sediments resulting in a 14 km thick sedimentary sequence in the south basin of the Dead Sea.