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Fan Y H，Wang H W，Wen R Z，Ren Y F. 2023. Estimating stress drop of the 2013 Lushan earthquake sequence based on the empirical Green’s function spectral ratio method. Acta Seismologica Sinica，45（1）：98−106. DOI: 10.11939/jass.20210155
Citation: Fan Y H，Wang H W，Wen R Z，Ren Y F. 2023. Estimating stress drop of the 2013 Lushan earthquake sequence based on the empirical Green’s function spectral ratio method. Acta Seismologica Sinica，45（1）：98−106. DOI: 10.11939/jass.20210155
shu

Estimating stress drop of the 2013 Lushan earthquake sequence based on the empirical Green’s function spectral ratio method

  • 1.

    Institute of Engineering Mechanics，China Earthquake Administration，Harbin 150080，China

  • 2.

    Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration，Harbin 150080，China

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  • Received Date: October 07, 2021
  • Revised Date: January 15, 2022
  • Available Online: December 28, 2022
  • Published Date: January 16, 2023
    Graphical Abstract
    • Abstract
  • We adopted the 2013 Lushan aftershocks as a typical example, to investigate the feasibility of estimating corner frequency and stress drop by the empirical Green’s function （EGF） spectral ratio method based on the strong motion observation data. Firstly, we suggested the quality standard on the EGF spectral ratio curve to guarantee the reliable estimation of seismic corner frequency and stress drop. The corner frequencies for the 17 Lushan aftershocks with magnitude in the range of 3.8−5.4 were then estimated. Referring to the seismic moment magnitude given by other studies, we further computed the seismic stress drops.The results show that the corner frequency of Lushan strong aftershocks is mainly in the range of 1.0−2.0 Hz, the average stress drop is 9.98 MPa, and seismic stress drop presents obvious dependency on seismic magnitude.
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