Characteristics of Seismic Wave Propagation in the Binchuan Region of Yunnan Using a Dense Seismic Array and Large Volume Airgun Shots

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英文篇名：Characteristics of Seismic Wave Propagation in the Binchuan Region of Yunnan Using a Dense Seismic Array and Large Volume Airgun Shots 作者：SHE ; Yuyang ; YAO ; Huajian ; WANG ; Weitao ; LIU ; Bin 英文作者：SHE Yuyang;YAO Huajian;WANG Weitao;LIU Bin;Laboratory of Seismology and Physics of Earth's Interior & School of Earth and Space Sciences, University of Science and Technology of China;Mengcheng National Geophysical Observatory, University of Science and Technology of China;Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics,China Earthquake Administration; 英文关键词：Airgun signal;;Body waves;;Wave propagation;;Binchuan basin;;Beamforming;;Polarization analysis 中文刊名：ZDZW 英文刊名：中国地震研究(英文版) 机构：Laboratory of Seismology and Physics of Earth's Interior & School of Earth and Space Sciences, University of Science and Technology of China;Mengcheng National Geophysical Observatory, University of Science and Technology of China;Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics,China Earthquake Administration; 出版日期：2019-05-15 出版单位：Earthquake Research in China 年：2019 期：v.33 基金：sponsored by the National Natural Science Foundation of China(GG2080000476);; the China Earthquake Science Experiment Project,China Earthquake Administration(2017CESE0101,2018CSES0101) 语种：英文; 页：ZDZW201902002 页数：12 CN：02 ISSN：11-2009/P 分类号：12-23

摘要

The Binchuan region of Yunnan is a structurally complex region with mountains, basins, and active faults. In this situation,seismic wave propagation exhibits complex characteristics due to strong heterogeneity of underground media instead of following the great-circle path. In order to obtain a high-resolution shallow crustal structure, a dense seismic array was deployed during March 21 to May 30, 2017 in this area. To better understand the complexities of seismic wave propagation in this region, we perform array-based frequency-domain beamforming analysis and single-station based polarization analysis to investigate the characteristics of seismic wave propagation, using airgun-generated P-wave signals recorded by dense array stations in this experiment. The results from these two methods both reveal similar but complex characteristics of seismic wave propagation in the Binchuan basin. The azimuth anomalies off the great-circle path are quite large with values up to 30°, which is caused by strong structural heterogeneity in the very shallow crust. Our research provide a better understanding of the complex geologic structures in this area and provide guidance for detecting concealed faults and distribution of velocity anomalies.
        The Binchuan region of Yunnan is a structurally complex region with mountains, basins, and active faults. In this situation,seismic wave propagation exhibits complex characteristics due to strong heterogeneity of underground media instead of following the great-circle path. In order to obtain a high-resolution shallow crustal structure, a dense seismic array was deployed during March 21 to May 30, 2017 in this area. To better understand the complexities of seismic wave propagation in this region, we perform array-based frequency-domain beamforming analysis and single-station based polarization analysis to investigate the characteristics of seismic wave propagation, using airgun-generated P-wave signals recorded by dense array stations in this experiment. The results from these two methods both reveal similar but complex characteristics of seismic wave propagation in the Binchuan basin. The azimuth anomalies off the great-circle path are quite large with values up to 30°, which is caused by strong structural heterogeneity in the very shallow crust. Our research provide a better understanding of the complex geologic structures in this area and provide guidance for detecting concealed faults and distribution of velocity anomalies.

引文

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