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Seismic Event Location Calibration Using the Eastern Turkey Broadband Seismic Network: Analysis of the Agri Dam Explosion

Bogazici University
Kandilli Observatory and Earthquake Research Institute
Istanbul, Turkey
gurbuz{at}boun.edu.tr
(C.G., N.T., T.B., R.G.)

University of Missouri
Department of Geological Sciences
Columbia, Missouri 65211
sandvole{at}missouri.edu
(E.S.)

Cornell University
Institute for the Study of the Continents
Ithaca, New York 14853
(D.S., M.B.)

A 12-ton controlled source explosion took place in eastern Turkey on 5 June 2001 and was recorded by 18 stations of the Eastern Turkey Seismic Experiment (ETSE) PASSCAL broadband network. This is a unique recording obtained for the first time in this region. Due to the blasting type and extremely high Lg and Sn attenuation in eastern Turkey, the blast is only observed out to a distance of about 300 km. We have used travel-time data from this explosion to obtain average crustal structure and site correction terms for the stations. The explosion was located using two new regional velocity models and the IASP91 velocity model to test the location capabilities of the ETSE network. We found that for surface focus events, the ETSE network is able to locate events to within 1–2 km of the true epicenter.