HR: 14:10h
AN: T53D-03    [Abstracts]
TI: P-Wave Velocity Structure Beneath Eastern Eurasia From Finite Frequency Seismic Tomography
AU: * Yang, T
EM: tyang@gso.uri.edu
AF: Graduate School of Oceanography University of Rhode Island, South Ferry Rd, Narragansett, RI 02882 United States
AU: Shen, Y
EM: yshen@gso.uri.edu
AF: Graduate School of Oceanography University of Rhode Island, South Ferry Rd, Narragansett, RI 02882 United States
AU: Yang, X
EM: xiaoping.yang@saic.com
AF: Science Applications International Corporation, 4001, Fairfax Dr. Suite 450, Arlington, VA 22203 United States
AB: Eastern Eurasia is one of the most tectonically complex regions in the world. While the evolution history of continental lithosphere has been well recognized, the fine structure associated with the complicated deformation in this region is far from clear, and deep mantle processes that accompanied shallower lithosphere deformations are poorly understood. In order to improve the resolution of the velocity structure in the region, we applied the newly-developed Finite Frequency Seismic Tomography (FFST) method, which utilizes the 3D Fr‚chet-Born sensitivity kernels of the travel times of finite frequency seismic waves to account for wavefront healing and off-ray scattering, to eastern Eurasia. In addition to the new technique, we obtained a comprehensive finite-frequency body wave travel time data set from cross-correlation of broadband waveforms. Datasets used in this study include waveforms from the publicly accessible sources (e.g. IRIS, GSN, PASSCAL, and IMS stations) and other seismic networks in the region such as the Japanese Broadband Seismograph Network (F-net), the Japanese International Seismic Network (JISNET), the Taiwan Broadband Seismic Network and China National Digital Seismic Network. Taking advantage of broadband waveforms, we measured relative delays times by waveform cross-correlation in three frequency bands between 0.03 to 2 Hz for P waves. The travel times in the three frequency bands were inverted jointly to take advantage of the `data fusion' made possible by the finite-frequency kernels and separately to understand the resolving power of each data set. Preliminary results are comparable to the velocity models obtained in previous tomographic studies.
DE: 1236 Rheology of the lithosphere and mantle (7218, 8160)
DE: 7200 SEISMOLOGY
DE: 7208 Mantle (1212, 1213, 8124)
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 7270 Tomography (6982, 8180)
SC: Tectonophysics [T]
MN: Fall Meeting 2005