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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:37 |
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Conference: Bucharest University Faculty of Physics 2010 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Preliminary P-wave velocity model in case of Dobrogea (Romania) and surrounding regions as revealed by 3 D tomography inversions
Authors:
F.Borleanu (1), B.Zaharia(1), L. Manea(1), Mihaela Popa(1), M. Diaconescu(1), M. Radulian(1), S. Baher(2)
Affiliation:
(1) National Institute for Earth Physics (Romania)
(2) Air Force Technical Application Center (USA)
E-mail
felix@inf.ro
Keywords:
tomography, cross-correlation, heterogeneous
Abstract:
The general features of the 3D velocity structure of the crust of Dobrogea and surrounding area, one of the tectonically and seismically active regions in Romania are investigated using tomography inversion algorithm. Travel time and cross-correlation data are selected for the events of Dobrogea and surrounding regions occurred between 2007 and 2009. The input data consist of 356 P-wave travel time differences resulted from cross-correlation algorithm (von Seggern, 2006) and 659 P-wave arrival times taken from Romplus catalog (Oncescu et. al., 1999) from 167 local earthquakes recorded by 28 short-period and broadband seismograph stations. Two different 3 D tomography algorithms are applied: tomoDD (Zhang, H. and Thurber C.H., 2003) and LOTOS (Koulakov, 2009), and the corresponding results are compared to test the reliability of our results. The acquired tomographic images resulted from tomoDD algorithm show that the 3D velocity structure beneath the region is heterogeneous with low velocity throughout the western part both in the upper and deeper layers. When the new 3 D model of the crustal structure obtained by tomographic inversions is incorporated in the location procedure, it leads to more accurate hypocenter locations.
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