Ground-motion heterogeneity across four subdomains in Yunnan, China revealed by generalized spectral inversion.

ABSTRACT: 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 (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 (M_w) 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

SUBMITTER: Wang Z 

PROVIDER: S-EPMC12627742 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature