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Han L，Tao Z R，Cao Z L，Tao X X. 2022. Preliminary discussion and identification of pulse-like strong motion for the 1979 Imperial Valley earthquake. Acta Seismologica Sinica，44（1）：158−169. DOI: 10.11939/jass.20210089
Citation: Han L，Tao Z R，Cao Z L，Tao X X. 2022. Preliminary discussion and identification of pulse-like strong motion for the 1979 Imperial Valley earthquake. Acta Seismologica Sinica，44（1）：158−169. DOI: 10.11939/jass.20210089
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Preliminary discussion and identification of pulse-like strong motion for the 1979 Imperial Valley earthquake

  • 1.

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

  • 2.

    School of Civil Engineering， Hebei University of Engineering， Hebei Handan 056038，China

  • 3.

    School of Civil Engineering，Harbin Institute of Technology，Harbin 150090，China

More Information
  • Received Date: May 29, 2021
  • Revised Date: August 26, 2021
  • Available Online: February 14, 2022
  • Published Date: March 17, 2022
    Graphical Abstract
    • Abstract
  • Taking the 1979 MW6.5 Imperial Valley earthquake as an example, we compared the three methods of pulse-like strong motion identification, that is, wavelet analysis, peak-point method （PPM） and zero velocity point method （ZVPM）. The identified peak values are similar, however, the identified pulse periods are slightly different. To analyze the mechanism of the velocity pulse, including the generation time, location, and the impact of asperity, we use the frequency-wavenumber Green’s function （FK method） to synthesize broadband ground motion. PPM is used to gradually identify the velocity pulses during the superposition of the sub-source ground motions. Analyzing the changes of the frequency components in sub-fault ground motion during the superposition process by using time-frequency analysis method and the impact of the spatial relationship between the asperity and the station on the pulse generation, preliminarily discuss the generation mechanism of the velocity pulse.
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    • References (32)
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