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Liu Qi, Zhang Jing, Chi Sun Liang, Yan Wei. 2014: Time-frequency characteristics of four-component borehole strain at Guzan station before and after 2013 Lushan MS7.0 earthquake. Acta Seismologica Sinica, 36(5): 770-779. DOI: 10.3969/j.issn.0253-3782.2014.05.002
Citation: Liu Qi, Zhang Jing, Chi Sun Liang, Yan Wei. 2014: Time-frequency characteristics of four-component borehole strain at Guzan station before and after 2013 Lushan MS7.0 earthquake. Acta Seismologica Sinica, 36(5): 770-779. DOI: 10.3969/j.issn.0253-3782.2014.05.002
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Time-frequency characteristics of four-component borehole strain at Guzan station before and after 2013 Lushan MS7.0 earthquake

  • 1.

    China Earthquake Administration Key Laboratory of Earthquake Prediction, Beijing 100036, China

  • 2.

    Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China

  • 3.

    Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China

  • 4.

    China Earthquake Networks Center, Beijing 100045, China

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  • Received Date: September 04, 2013
  • Revised Date: December 16, 2013
  • Published Date: August 31, 2014
    Graphical Abstract
    • Abstract
  • The four-component borehole strainmeter at Guzan station in Sichuan Province recorded abnormal strain signals with high frequency before the 20 April 2013 Lushan MS7.0 earthquake, which were similar to the signals before the Wenchuan MS8.0 earthquake. The strain data were processed in the way of S transform in order to analyze the evolutionary process of each component of abnormal signals in time-frequency domain, and study the validity of the anomalies and its relation with Lushan earthquake. The result shows that two clusters of anomalies with high energy appeared during the research period, one in October of 2012 lasting for four months, and the other several days before the earthquake. The validity of the anomalies is high, considering that the disturbance of teleseismograms and engineering construction during this period are not the main cause for the anomalies. The anomalies are composed of all kinds of signals with various periods from several minutes to hours, of which the short-period signals appeared later and decayed sooner. The whole energy of the anomalies after the earthquake began to decay gradually, and the signal components began to reduce, too. The strain observation had returned to normal by the end of August 2013. The whole evolutionary process of strain anomalies in time-frequency domain has very close relations to the Lushan MS7.0 earthquake.
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    • References (11)
  • 余怀忠. 2006. 地震前兆物理模型与地震预测初步研究[R]. 博士后出站报告. 北京: 中国地震局地质研究所: 41-51.

    Yu H Z. 2006. Preliminary Studies on Mechanical Models of Earthquake Precursors and Earthquake Prediction[R]. Postdoctorate research report. Beijing: Institute of Geology, China Earthquake Administration: 41-51 (in Chinese).
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