presentation overview

PRESENTATION OVERVIEW● Tectonic Setting and Motivations

● DESERT Project

● Receiver Function Method

● Results

• Crust-Mantle Boundary➔ Determination of crustal thickness and Vp/Vs using two methods and error

analysis

• A Lower Crustal Discontinuity East of the DST➔ Discussion of two methods (inversion and forward modeling)

• Upper Mantle Transition Zone

• MOHSIN

AYMAN MOHSIN

Mediterranean Sea

Arabian Plate

African Plate

Automatic GEOFON Global Seismic Monitor

Dead Sea Region

Magnitude: 5.5Origin time: 2004/02/11 08:15:01 UTCLongitude: 35.8°ELatitude: 31.6°

ID VP/Vs (TT) Vp/Vs (ZK) Dif H TT (km) H ZK (km) DifID02 1.74 1.74 0 31 32 1ID01 1.75 1.74 0.01 31 31 0ID03 1.72 1.73 0.01 32 31 1ID12 1.85 1.83 0.02 32 31 1ID26 1.76 1.77 0.01 33 33 0ID05 1.81 1.81 0 32 31 1ID15 1.76 1.75 0.01 32 32 0ID07 1.8 1.81 0.01 32 32 0ID04 1.77 1.75 0.02 32 32 0ID17 1.8 1.81 0.01 32 33 1ID08 1.8 1.8 0 33 32 1ID21 1.77 1.75 0.02 32 33 1JS02 1.73 1.75 0.02 33 32 1

ID16 1.92 1.83 0.09 33 31 2JW01 1.79 1.81 0.02 33 32 1JK01 1.68 1.73 0.05 31 31 0ID19 1.77 1.76 0.01 34 35 1ID27 1.77 1.76 0.01 34 34 0ID06 1.83 1.83 0.01 33 34 1ID28 1.57 1.74 0.17 32 34 2JK04 1.9 1.89* 1.77 0.01 34 35 1JD05 1.77 1.8 0.03 34 35 1JK05 1.76 1.79 0.03 35 35 0JW05 1.76 1.76 0 37 37 0JD06 1.76 1.75 0.01 36 36 1ID31 1.78 1.79 0.01 33 33 0ID32 1.72 1.75 0.03 32 32 0JS03 2.1 1.70* 1.77 0.4 38 38 0JW09 1.75 1.73 0.02 32 32 0JS06 1.74 1.73 0.01 33 33 0JS07 1.74 1.74 0 32 32 0

Concluding Remarks● The crustal structure is about 33 km east and west of the Dead Sea

Transform ±2 km topography. Exactly at the location of the controlled source line is an exceptional local depression of the Moho in Jordan (~38 km).

● The resulting Moho depth profile agrees well with the controlled source techniques.

● There is clear difference in the internal crustal structure east and west of the DST. The western crust is fairly homogeneous, while the eastern crust has a strong lower crustal reflector.

● The DST is of deep seated nature extending at least to the Moho.● There are no clear systematics in the distribution of the Vp/Vs

ratios.● The P-to-S converted phases from the 410 and 660 km

discontinuities are not typical for a continental upper mantle. They are delayed by 2 sec with respect to IASP91 . This would suggest that the upper mantle velocity above 410 km is 3-4% slower than the standard model.