Preliminary analysis of strong motion characteristics of the Maerkang earthquake swarm in Sichuan on June 10,2022
Xu Tong
Zhou Baofeng
Wang Xiaomin
Ren Yefei
Zhang Yajun
Abstract：On June 10,2022,an earthquake swarm consisting of Ms5.8,Ms4.1,Ms4.4,Ms6.0,and Ms5.2 earthquakes occurred in Maerkang,Sichuan,China.This study filtered and analyzed the strong-motion records,conducted time-frequency analysis on acceleration data,and compared energy distributions among these earthquakes.By referencing the Fifth Genera-tion Seismic Zoning Map,the attenuation relationships of peak ground acceleration(PGA),peak ground velocity(PGV),and spectral acceleration(SA)were analyzed.The acceleration and velocity response spectra,as well as Fourier amplitude spectra,were calculated and com-pared.Results indicate similar energy distribution patterns,with the attenuation model in the Fifth Generation Seismic Zoning Map predicting PGA,PGV,and SA(0.2)well of Ms＞5.0 earthquakes but overestimating SA(0.5)and SA(1.0).Response spectrum shapes and peak periods were identical at the same station,with values not exceeding local seismic design speci-fications.Normalized response spectra highly coincided for T＜0.2 s in Ms＞5.0 earthquakes.Horizontal Fourier spectra were similar,with main frequencies in the 10-20 Hz range.Strong correlations were observed among acceleration and Fourier spectra in the same direction at the same station for all five earthquakes.
Keywords：maerkang earthquakeswarm type earthquakesattenuation relationshipreaction spectrum
Publication Date：2025-02-27
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 122-135 )