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Characteristics of Seismic Wave Propagation in the Binchuan Region of Yunnan Using a Dense Seismic Array and Large Volume Airgun Shots
SHE Yuyang1, YAO Huajian1,2, WANG Weitao3, LIU Bin1
1.Laboratory of Seismology and Physics of Earth's Interior & School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2.Mengcheng National Geophysical Observatory, University of Science and Technology of China, Mengcheng 233500, Anhui, China;3.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
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.
关键词:  Airgun signal  Body waves  Wave propagation  Binchuan basin  Beamforming  Polarization analysis
DOI:10.19743/j.cnki.0891-4176.201902006
分类号:
基金项目:This project is sponsored by the National Natural Science Foundation of China (GG2080000476) and the China Earthquake Science Experiment Project, China Earthquake Administration (2017CESE0101, 2018CSES0101).
Characteristics of Seismic Wave Propagation in the Binchuan Region of Yunnan Using a Dense Seismic Array and Large Volume Airgun Shots
SHE Yuyang1, YAO Huajian1,2, WANG Weitao3, LIU Bin1
1.Laboratory of Seismology and Physics of Earth's Interior & School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2.Mengcheng National Geophysical Observatory, University of Science and Technology of China, Mengcheng 233500, Anhui, China;3.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
Abstract:
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.
Key words:  Airgun signal  Body waves  Wave propagation  Binchuan basin  Beamforming  Polarization analysis