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《Chinese Journal of Geophysics》 2008-01
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Crust-mantle velocity structure of S wave and dynamic process beneath Burma Arc and its adjacent regions

HU Jia-Fu~1,HU Yi-Li~1, XIA Jing-Yu~1,CHEN Yun~2,ZHAO Hong~1,YANG Hai-Yan~11 Geophysics Department of Yunnan University, Kunming 650091,China2 Institute of Geology and Geophysics of Chinese Academy of Science, Beijing 100029,China  
The Rayleigh dispersion data of 530 selected paths crossing Burma Arc and its adjacent regions are determined by applying the MF-FTAN(Matched-Filter Frequency-Time Analysis ) technique to long period data recorded at SHIO, CHTO, KMI, and LSA stations, the periods of the Rayleigh dispersion are in the range of 10.45~105.03 s. On this basis, a method of grid dispersion inversion is proposed to extract pure-path dispersion in a 1°×1° grid from mixed-path dispersion. Then, the S velocity structure to a depth of 200 km is inverted from pure-path dispersion in each grid cell, finally, the 3-D velocity structure of S wave is reconstructed beneath Burma Arc and its adjacent regions. The result shows that taking Sagain fault as the boundary, the velocity of crust on the west side of the fault is higher than one on the east side of the fault; lithosphere depth is in the range of 110~130 km and the S wave velocity at the top of upper mantle is 4.3~4.4 km/s beneath the Indo-Burma regions; however, on the east side of Burma Arc; there is a lower-velocity column of uprising mantle about 150~200 km wide beneath Yunnan-Myanmar-Thailand Block; the lithosphere depth is 70~80 km and the velocity of S wave at the top of mantle is 4.1~4.2 km/s in the area. On the other hand, the S wave velocity structure shows an EW(east-west) variation, this distribution feature corresponds to the distribution of epicenters and volcanoes, and the strike of faults.
【Fund】: 国家自然科学基金(40674042);; 云南省自然科学基金(2006D0011M)资助项目
【CateGory Index】: P315.31
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