Short-scale variations of shear-wave splitting across the Dead Sea basin: 
Evidence for the offects of sedimentary fill

Kaviani, A.; Rümpker, G.; Weber, Michael; Asch, Günter

doi:10.1029/2010GL046464

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Short-scale variations of shear-wave splitting across the Dead Sea basin: Evidence for the offects of sedimentary fill

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Kaviani, A.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

Rümpker, G.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

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Weber, Michael
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

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Asch, Günter
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

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Citation

Kaviani, A., Rümpker, G., Weber, M., Asch, G. (2011): Short-scale variations of shear-wave splitting across the Dead Sea basin: Evidence for the offects of sedimentary fill. - Geophysical Research Letters, 38, L04308.
https://doi.org/10.1029/2010GL046464

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_243254

Abstract

We examine shear-wave splitting of SKS waveforms collected by a temporary array of 68 stations in the region of the Dead Sea basin. The observed splitting parameters exhibit systematic variations along a dense, EW-trending 60 km profile across the basin. The delay times vary significantly between 1.0 and 2.8 seconds with smaller values in the very center of the profile. The fast polarizations are oriented more-or-less parallel to the strike of the Dead Sea transform fault and vary between −10 and 20 degrees with respect to North. Finite-frequency waveform modeling reveals that the source-region of the small-scale lateral variations is likely located within the crust. The modeling further shows that purely isotropic velocity variations affect shear-wave splitting: To a large degree, the observed variations of splitting parameters can be explained by the sedimentary fill of the basin and its low isotropic seismic velocities, whereas the mantle is uniformly anisotropic. Our study indicates that precaution must be taken when interpreting short-scale lateral variations of shear wave splitting in terms of anisotropic structures in the crust or upper mantle.