Ground-motion heterogeneity across four subdomains in Yunnan, China revealed by generalized spectral inversion
Ziyan Wang, Xiaojun Li, Lei Fu, Su Chen, Kelin Chen, Yiming He
TL;DR
The study reveals how ground motion varies in different regions of Yunnan, China, using earthquake data and inversion techniques.
Contribution
The paper introduces a new method for analyzing ground-motion heterogeneity across tectonically distinct subregions in Yunnan.
Findings
Stress drops in Regions C and D are higher than in Regions A and B.
Reverse-faulting events show higher average stress drops compared to other fault types.
Eastern regions (C and D) have lower Q0 and stronger S-wave attenuation.
Abstract
This study investigates regional ground-motion characteristics in Yunnan Province using 1,065 recordings from 60 small-to-moderate earthquakes (3.0 ≤ Mw ≤ 6.0) at 65 stations. A generalized inversion technique (GIT) using empirical reference site was applied to four tectonically distinct subregions (A–D). The inversion results reveal stress drops (Δσ) ranging from 0.3 to 7.34 MPa, with the highest averages in Regions C and D (2.21 MPa), followed by Region A (2.07 MPa) and Region B (1.16 MPa). Δσ shows no clear dependence on moment magnitude (Mw) or focal depth but correlates with surface heat flow. Reverse-faulting events exhibit a higher average Δσ than strike-slip and normal-faulting events. Quality factor models for the four study areas (A–D) are 118.41f 0.691, 120.26f 0.638, 77.20f 0.598 and 72.19f 0.861, respectively. The eastern regions (C and D) exhibit lower Q0 and stronger…
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Taxonomy
TopicsSeismic Performance and Analysis · High-pressure geophysics and materials · earthquake and tectonic studies