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Bao Feng, Ni Sidao, Zhao Jianhe, Xie Jun, Chen Weiwen, Zeng Xiangfang. 2013: Anqing earthquake; double-difference earthquake location algorithm; instrumental clock error; sPL; S-P arrival time difference. Acta Seismologica Sinica, 35(2): 160-172. DOI: 10.3969/j.issn.0253-3782.2013.02.003
Citation: Bao Feng, Ni Sidao, Zhao Jianhe, Xie Jun, Chen Weiwen, Zeng Xiangfang. 2013: Anqing earthquake; double-difference earthquake location algorithm; instrumental clock error; sPL; S-P arrival time difference. Acta Seismologica Sinica, 35(2): 160-172. DOI: 10.3969/j.issn.0253-3782.2013.02.003
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Anqing earthquake; double-difference earthquake location algorithm; instrumental clock error; sPL; S-P arrival time difference

  • 1.

    Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

  • 2.

    State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China

  • 3.

    Earthquake Administration of Anhui Province, Hefei 230031, China

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  • Received Date: February 14, 2012
  • Revised Date: August 02, 2012
  • Published Date: February 28, 2013
    Graphical Abstract
    • Abstract
  • Accurate locations of aftershocks are helpful for understanding rupture process of the main shock. In order to suppress the impact of instrumental clock error, the arrival-time differences between S and P by the temporary seismic array installed after the 19 January 2011 Anqing earthquake were used to reconstruct the travel-time data of P and S and more accurate locations of the main shock and aftershocks were obtained by using master event and double-difference earthquake location algorithm; an algorithm was proposed to estimate the range of clock error; more reliable depth distribution of the aftershocks was also obtained via analysing sPL, a depth phase at near epicentral distance. The result shows that the Anqing earthquake occurred near Susong--Zongyang fault zone, and the aftershocks concentrated nearly horizontally in the depth range of about 5 km, spreading in the shape of a thin slab around 1.5 km long, 1.0 km wide and 0.3 km thick; the sequence tended to spread northeastward as time went on. The study suggests that earthquake location based on S--P arrival-time difference method can effectively eliminate the influence of clock error, providing reliable results for moderate, minor earthquakes and aftershocks.
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    • References (41)
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