Analysis of the Impact of Topographic Effect on Ground Motion Characteristics in the Extreme Seismic Region of Yangbi MS6.4 Earthquake on May 21, 2021

Libao Zhang, Lei Fu (), Zhenghua Zhou, Guoliang Lin, Su Chen, Aiwen Liu and Xiaojun Li
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Libao Zhang: China Earthquake Administration, Institute of Geophysics
Lei Fu: China Earthquake Administration, Institute of Geophysics
Zhenghua Zhou: Nanjing Tech University
Guoliang Lin: Yunnan earthquake Agency
Su Chen: Beijing University of Technology
Aiwen Liu: China Earthquake Administration, Institute of Geophysics
Xiaojun Li: China Earthquake Administration, Institute of Geophysics

A chapter in Proceedings of the 10th Annual Meeting of Risk Analysis Council of China Association for Disaster Prevention (RAC 2022), 2023, pp 101-115 from Springer

Abstract: ABSTRACT This paper conducted a damage investigation on the micro epicenter of the Yangbi Ms6.4 earthquake on May 21, 2021. Based on the observation data of mobile observation topographic array, the influence of topographic effect on ground motion characteristics is analyzed. It is found that if the seismic wave is incident perpendicular to the mountain trend, the steep slope will amplify the high-frequency part of the seismic wave, and there are obvious differences in the low-frequency part of Fourier amplitude spectrum along the mountain trend and vertical at different elevations. The site component ( $$\kappa_{0}$$ κ 0 ) of high-frequency attenuation parameters is calculated by spectral attenuation method, then the relationship between the horizontal component of $$\kappa_{0}$$ κ 0 , the vertical component of $$\kappa_{0}$$ κ 0 , the ratio of horizontal to vertical component of $$\kappa_{0}$$ κ 0 and station elevation, site weakness and dominant frequency is analyzed respectively. The results show that in the small-scale range, the horizontal and vertical components of $$\kappa_{0}$$ κ 0 have strong spatial heterogeneity, which needs further verification.

Keywords: earthquake damage phenomenon; high frequency attenuation parameters; site effect; topographic effect (search for similar items in EconPapers)
Date: 2023
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DOI: 10.2991/978-94-6463-194-4_15

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