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Wang Zhenjie, Sun Kan, Zhu Xinyun. 2019: Focal depth determination of Shanxi reservoir earthquakes from sPL phase with single station. Acta Seismologica Sinica, 41(6): 735-742. DOI: 10.11939/jass.20190110
Citation: Wang Zhenjie, Sun Kan, Zhu Xinyun. 2019: Focal depth determination of Shanxi reservoir earthquakes from sPL phase with single station. Acta Seismologica Sinica, 41(6): 735-742. DOI: 10.11939/jass.20190110
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Focal depth determination of Shanxi reservoir earthquakes from sPL phase with single station

  • Zhejiang Earthquake Agency，Hangzhou 310013，China

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  • Received Date: June 22, 2019
  • Revised Date: September 11, 2019
  • Available Online: December 15, 2019
  • Published Date: October 31, 2019
    Graphical Abstract
    • Abstract
  • It is difficult to determine focal depth via phase onset time fitting method for the regions where only sparse seismic stations are available. we demonstrate that focal depth can be well constrained with depth phase sPL which is sensitive to focal depth but insensitive to epicentral distance. With 2014 Shanxi reservoir earthquake swarm as a case study, this paper determined the focal depths of earthquakes by sPL phase with single station. The result show that the focal depths derived from sPL phase are well consistent with the results from CAP method and Hyposat method. The depths of the main shock and six ML＞3.0 events are predominantly around 4−6 km, which is coincident with results of surveying and prospecting of active fault. Therefore sPL phase can be applied to small earthquakes for sparse network as it is well observed with small epicentral distances. Robust result of focal depth can be rapidly obtained by single broadband seismic station with bias of about 1−2 km.
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    • References (29)
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