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

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.

發文機構：Laboratory of Seismology and Physics of Earth's Interior&School of Earth and Space Sciences Mengcheng National Geophysical Observatory Key Laboratory of Seismic Observation and Geophysical Imaging

關鍵詞：AirgunsignalBodyWAVESWavePROPAGATIONBinchuanbasinBEAMFORMINGPOLARIZATIONanalysis

分類號： TP751.1[自動化與計算機技術—控制科學與工程][自動化與計算機技術—檢測技術與自動化裝置]