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2013年4月20日芦山MS7.0地震是继2008年汶川MS8.0地震后发生在龙门山断裂带的又一强震,与汶川地震相似,该震临震前在近震源区未观测到显著的异常变化。为研究其临震前形变特征,本文根据信息熵理论对芦山MS7.0地震前近震源区的连续形变观测资料进行了年变熵率值分析,并研究其时序上的分布特征。结果表明,震前近震源区台站地倾斜形变熵均表现出减熵现象,时序的年尺度熵结果表明,汶川MS8.0地震对芦山MS7.0地震具有一定的触发作用,且震中区的EW向和NS向分量具有高度一致的熵变趋势。
April 20, 2013 The Lushan MS7.0 earthquake is another strong earthquake that occurred in the Longmen Shan fault zone after the MS8.0 Wenchuan earthquake in 2008, which is similar to the Wenchuan earthquake, and was not observed in the near source region before the earthquake Significant abnormal changes. In order to study the pre-quake deformation features, this paper analyzed the annual deformation entropy rate of the near-focal-origin deformation data of the Lushan MS7.0 earthquake, and studied the distribution characteristics of the time-dependent entropy. The results show that the deformation entropy at the station near the epicentral to the epicenter shows the entropy reduction phenomenon. The chronological entropy results show that the MS 8.0 Wenchuan earthquake has a certain triggering effect on the Lushan MS7.0 earthquake, and the epicentral area EW and NS components have a highly consistent trend of entropy change.