Regional Seismological Research in the Middle East in Support of CTBT Monitoring
CORNELL UNIV ITHACA NY INST FOR THE STUDY OF THE CONTINENTS
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In order to decipher the character and pattern of regional seismic phase propagation we have continued to compile a large data set of regional and local seismograms recorded in the Middle East. We have mapped zones of blockage, inefficient, and efficient propagation for Lg and Sn. Two tomographic techniques have been developed in order to objectively determine regions of efficient and inefficient regional phase propagation. We have found that regional wave propagation in this region is very complex hence the station density from our data set in this region is invaluable. We have collected data from Saudi Arabia, Oman, Turkey and Syria in order to further improve our resolution of our wave propagation tomographic models. Furthermore, this quantity of data will allow us to isolate the source, site, and path effects in the generation of Lg, Sg, and Pg. We have also continued our study of crustal and upper-most mantle structure in the Middle East using receiver function interpretation and grid search waveform modeling. Data from our ongoing broadband experiment in eastern Turkey combined with three-component short period receiver functions in Syria have begun to give us an accurate idea of crustal thickness in the northern portion of the Middle East. We also plan to calculate receiver functions in Saudi Arabia in order to map crustal thickness variations across the Arabian Shield. We also have begun to collect all available travel time observations in the Middle East in order to accurately determine the mantle P and S-wave velocity structure. We have initially focused on Pn travel time tomography. This work will provide important new reliable models of variations in upper mantle seismic wave velocities. All of the above results will be integrated in the Cornell GIS system.
- Seismic Detection and Detectors