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Yihe Xu, Baoshan Wang, Weitao Wang, Bo Zhang, Tianwei Sun. 2018: Multiple seismological evidences of basin effects revealed by Array of Binchuan (ABC), northwest Yunnan, China. Earthquake Science, 31(5-6): 281-290. DOI: 10.29382/eqs-2018-0281-8
Citation: Yihe Xu, Baoshan Wang, Weitao Wang, Bo Zhang, Tianwei Sun. 2018: Multiple seismological evidences of basin effects revealed by Array of Binchuan (ABC), northwest Yunnan, China. Earthquake Science, 31(5-6): 281-290. DOI: 10.29382/eqs-2018-0281-8

Multiple seismological evidences of basin effects revealed by Array of Binchuan (ABC), northwest Yunnan, China

  • Dense array seismology, which is characterized by large number, densely deployed autonomous geophone/seismographs, has received great concerns worldwide recently, especially after the great success of dense array in Long Beach. One of the biggest curiosity is that if the great success in Long Beach is replicable in China. Hence, we analyze the seismic records from a dense array in Binchuan basin, Yunnan province, which consists of three-component short-period seismographs of three most common domestic models. The Binchuan basin is located near the intersection between the Chenghai-Binchuan fault and the Red River fault, with the latter being the major fault accommodating significant tectonic deformation resulting from eastern extrusion of the Tibetan plateau. Both faults pose serious seismic threats to local residents in Binchuan basin. Basin-range differences, faults, local earthquakes, and a Fixed Airgun Seismic Transmitting Station (FASTS), make the Binchuan basin a perfect experiment site for dense array experiment. The array is named Array of Binchuan (ABC) and the main target is imaging the shallow crustal structure, especially the structure of the basin. To examine the monitoring capability of ABC, we analyze the seismograms to check if they can reveal the basin, the most significant geological feature in the area. Power spectral density analysis, travel time and amplitude analysis of FASTS signals, and amplitude analysis of earthquakes and noise cross-correlation functions are used in the analysis. All the results show correlation with the basin and clear difference between basin and non-basin area. Therefore, the preliminary results support that the ABC has the potential to provide constraints on local structures.
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