Abstract
AbstractWe have selected 27530 ML amplitude readings from 5897 events recorded by 149 stations, as reported in the Annual Bulletin of Chinese Earthquakes (ABCE) and regional seismic network of Yunnan province and Sichuan province, and have used tomographic imaging to estimate the lateral variations of the quality factor Q0 (Q at 1Hz) in the crust of Sichuan‐Yunnan and its adjacent regions. Estimated Q0 values vary from 200 to 600 with an average of 400. Q0 value is consistent with tectonic and topographic structure. Q0 is low in the active tectonic regions having many faults, such as the Haiyuan‐Qilian, Fenhe‐Weihe, East Kunlun zones, Western Sichuan‐Northwestern Yunnan‐Baoshan area, and Yunnan and Guizhou boundary‐Kunming‐Simao area. Q0 is high in the stable regions, such as Sichuan Basin, Markam block, Western Guangxi‐Eastern Yunnan block, Ordos Craton, and Qinling‐Dabie area. Additionally, the gains of most of the station terms in Sichuan‐Yunnan and its adjacent regions are near 1.0, only a few as large as 2.0, and the distribution is irregular. Most of the magnitude biases are less than 0.3, only a few as large as 0.4, and the distribution has relation with Q0 value variation, which means that the seismic attenuation has influence on the magnitude measurement.
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