S-velocity isotropic and radially anisotropic mantle structure beneath the Arabian Peninsula and East Africa using multi-mode dispersion curves
Abstract
We investigate the lithosphere and upper mantle structure beneath the Arabian Peninsula and East Africa by using multi-mode dispersion curves. We used 204 events data with >5.5 and epicentral distances smaller than 40 degree and 457 stations from SGS, IRIS and GEOFON. We also combined our data set with global dispersion data sets from previous studies. We constructed S-velocity isotropic and radially anisotropic models at 5 ~ 120 km depths by inverting dispersion data with period ranged of 5 ~ 150 s. Our preliminary results present low-velocity anomalies at 10 ~ 30 km depths beneath generally the Arabian Peninsula and East Africa, while high-velocity anomalies at 20 km depth are observed beneath the Red Sea. Radial anisotropic results generally show positive anisotropy beneath the study area at 20 ~ 40 km depths. Negative anisotropy observe at 5 ~ 20 km depths beneath the Red Sea and west of Tanzania.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.T21G0412K
- Keywords:
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- 7208 Mantle;
- SEISMOLOGY;
- 7218 Lithosphere;
- SEISMOLOGY;
- 8120 Dynamics of lithosphere and mantle: general;
- TECTONOPHYSICS;
- 8149 Planetary tectonics;
- TECTONOPHYSICS