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Assessing current faulting behaviors and seismic risk of the Anninghe-Zemuhe fault zone from seismicity parameters
作者姓名:易桂喜  闻学泽  范军  王思维
作者单位:Chengdu University of Technology,Earthquake Administration of Sichuan Province,Chengdu 610041,China,Earthquake Administration of Sichuan Province,Chengdu 610041,China,Earthquake Administration of Sichuan Province,Chengdu 610041,China Chengdu 610059,China Earthquake Administration of Sichuan Province,Chengdu 610041,China
基金项目:Chinese Joint Seismological Science Foundation (102002).
摘    要:Introduction Strong and large earthquakes are prepared and generated on specific segments of active fault zones, especially on the asperity parts of the zones (Aki, 1984; Wiemer, Wyss, 1997; Wyss, et al, 2000). Therefore, both the faulting-behavior identification and the rupture segmentation mainly based on the method of active tectonics are always important aspects in active fault research (DING, et al, 1993). The purposes of the two aspects of research focus on determining fault units tha…

收稿时间:14 January 2003
修稿时间:22 September 2003

Assessing current faulting behaviors and seismic risk of the Anninghe-Zemuhe fault zone from seismicity parameters
Yi Gui-xi , Wen Xue-ze , Fan Jun and Wang Si-wei.Assessing current faulting behaviors and seismic risk of the Anninghe-Zemuhe fault zone from seismicity parameters[J].Acta Seismologica Sinica(English Edition),2004,17(3):322-333.
Authors:Yi Gui-xi  Wen Xue-ze  Fan Jun and Wang Si-wei
Institution:1. Chengdu University of Technology, Chengdu 610059, China;Earthquake Administration of Sichuan Province, Chengdu 610041, China
2. Earthquake Administration of Sichuan Province, Chengdu 610041, China
Abstract:Using the data of regional seismic network, this paper analyzes the current faulting behaviors of different segments of the Anninghe-Zemuhe fault zone, western Sichuan, and identifies the likely risky segments for potential large earthquakes. The authors map the probable asperities from the abnormally low b-value distribution, develop and employ a method for identifying current faulting behaviors of individual fault segment from the combinations of multiple seismicity parameter values, and make an effort to estimate the average recurrence intervals of character-istic earthquakes by using the parameters of magnitude-frequency relationship of the asperity segment. The result suggests that the studied fault zone contains 5 segments of different current faulting behaviors. Among them, the Mianning-Xichang segment of the Anninghe fault has been locked under high stress, its central part is probably an asperity with a relatively large scale. The Xichang-Puge segment of the Zemuhe fault displays very low seismicity under low stress. Both the locked segment and the low-seismicity segment can be outlined on the across-profile of relocated hypocenter depths. The Mianning-Xichang segment is identified to be the one with potential large earth-quake risk, for which the average recurrence interval between the latest M = 6.7 earthquake in 1952 and the next characteristic event is estimated to be 55 to 67 years, and the magnitude of the potential earthquake between 7.0 and 7.5. Also, it has been preliminarily suggested that for a certain fault segment, its faulting behaviors may change and evolve with time gradually.
Keywords:seismicity parameter  faulting behavior  asperity  potential seismic risk  Anninghe-Zemuhe fault zone
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