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Path-specific Velocity Structure of Western China from Surface-wave Dispersion |
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| Authors: | Brett S Ketter Aaron A Velasco Charles J Ammon George E Randall |
| Institution: | (1) Department of Earth and Atmospheric Sciences, St. Louis University, St. Louis, MO 63103, USA;(2) Department of Geological Sciences, University of Texas at El Paso, El Paso, TX 79968-0555, USA;(3) Department of Geosciences, Penn State University, 440 Deike Bldg, University Park, PA 16802, USA;(4) Geophysics Group (EES-11), Los Alamos National Laboratory, Los Alamos, NM 87545, USA;(5) Department of Geosciences, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA |
| Abstract: | We develop one-dimensional (1-D) path-specific velocity models in western China using new Rayleigh and Love wave group and phase velocity dispersion measurements for 20 events in the region. The earthquakes were grouped into three geographic clusters from which we compute the average phase and group velocity dispersion. We invert the average dispersion curves simultaneously for 1-D shear-velocity models appropriate for the three central Asian paths, using three previous shear-velocity models as initial models. The models are validated by forward modeling waveforms of recent events. The crustal thickness beneath western China in the vicinity of the Lop Nor test site is 50–60 km and our velocity models are consistent with major geologic features (e.g., basins and mountain ranges) and previous structural models for this region. |
| Keywords: | China Tien Shan group velocity phase velocity surface waves velocity structure |
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