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Study Lithosphere Structure of Eurasian and the Surrounding Area by Surface Wave Method

Author: JiangKeZhi
Tutor: ZhuJieShou; ChengXianQiong
School: Chengdu University of Technology
Course: Earth Exploration and Information Technology
Keywords: Eurasia Rayleigh surface wave tomography dispersion curve
CLC: P631.4
Type: Master's thesis
Year: 2012
Downloads: 30
Quote: 0
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Abstract


In this paper, we collected more than35000seismic records in the range of40~oW~180~oE，40~oS~80~oN between2008and2011recorded by the permanent andtemporary seismic stations of Asia, Europe and western Pacific to image the3-D waveshear velocity of Eurasia and its surrounding areas. These records meet therequirements: magnitude between5and7, event depth less than100km, epicenterstation distance between10oand90o, and high SNR. The research region is coveredwell by the density ray paths.Cutting waveform and removing instrument response were done with SeismicAnalysis Code. We retrieved the dispersion curves of fundamental Rayleigh at period10S-200S by multiple filter analysis. The subsequent inversion of the dispersion curveto obtain the shear-wave velocity with depth is carried out through continuousregionalization algorithm.The check board test indicates that the lateral resolution is up to1~o×1~ofor themost research regions. Our results consistent with previous results show that thesurface wave tomographic method is efficiency and reasonable.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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