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- Title
Preliminary discussion and identification of pulse-like strong motion for the 1979 Imperial Valley earthquake.
- Authors
Han Lu; Tao Zhengru; Cao Zelin; Tao Xiaxin
- Abstract
Taking the 1979MW6.5 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.
- Publication
Dizhen Xuebao / Acta Seismologica Sinica, 2022, Vol 44, Issue 1, p158
- ISSN
0253-3782
- Publication type
Article
- DOI
10.11939/jass.20210089