Attenuation relation of PGAs in southwest China based on seismology

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (5) : 191-196.

EARTHQUAKE SCIENCE AND STRUCTURE SEISMIC RESILIENCE

Attenuation relation of PGAs in southwest China based on seismology

ZHENG Xingqun, ZHAO Boming*

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Abstract

All strong ground motion records in southwest China from 2009 to 2022 were collected, and small ground motion records of strong earthquake data below magnitude 5 were selected to form a data set. The geometric spreading term and the anelastic attenuation term were determined separately. Firstly, the least square method was used to piecewise fit the geometric segment points value, and the calculated results are 74 km for R1 and 125 km for R2. Then the four regional crustal medium parameters were obtained by genetic algorithm inversion: the stress drop is 77.06 MPa, the quality factor Q0 and η are 223.13 and 0.5697 respectively, and the near-surface high frequency attenuation parameter κ0 is 0.0686 s. Based on the inversion of crustal parameters, the acceleration Fourier spectrum was calculated, and the time history of ground motion under a certain magnitude and epicenter was obtained with random phase spectrum. The attenuation relationship of peak acceleration of ground motion in southwest China was established by extracting PGA. The results show that the attenuation relationship established is in good agreement with the actual strong earthquake records, especially in the near field area, which will provide important reference for the engineering construction in southwest China.

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southwest China / genetic algorithm / crustal medium parameter / attenuation relationship

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ZHENG Xingqun, ZHAO Boming. Attenuation relation of PGAs in southwest China based on seismology[J]. Journal of Vibration and Shock, 2025, 44(5): 191-196

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