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Ground-motion heterogeneity across four subdomains in Yunnan, China revealed by generalized spectral inversion
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Ground-motion heterogeneity across four subdomains in Yunnan, China revealed by generalized spectral inversion
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Journal Article
Ground-motion heterogeneity across four subdomains in Yunnan, China revealed by generalized spectral inversion
2025
Overview
This study investigates regional ground-motion characteristics in Yunnan Province using 1,065 recordings from 60 small-to-moderate earthquakes (3.0 ≤
M
w
≤ 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 (Δ
σ
) 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). Δ
σ
shows no clear dependence on moment magnitude (
M
w
) or focal depth but correlates with surface heat flow. Reverse-faulting events exhibit a higher average Δ
σ
than strike-slip and normal-faulting events. Quality factor models for the four study areas (A–D) are 118.41
f
0.691
, 120.26
f
0.638
, 77.20
f
0.598
and 72.19
f
0.861
, respectively. The eastern regions (C and D) exhibit lower
Q
0
and stronger S-wave attenuation, along with higher tectonic activity and lower surface heat flow. The predominant frequencies of average site amplification for GMX-A, GMX-B, GMX-C and GMX-D are 20.00 Hz, 10.83 Hz, 3.97 Hz, and 1.92 Hz, with corresponding amplification factors of 2.84, 4.31, 5.45, and 7.69. Finally, the inversion parameters were validated through stochastic finite-fault simulations of the 2009
M
S
6.3 Yao’an mainshock.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
