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Microseismicity and Fault Structure in the Daliangshan Subblock within the Southeastern Tibetan Plateau

Description: 

The Eastern Himalayan Syntaxis (EHS) is a critical region for understanding the interactions between tectonic stress, geothermal activity, and seismic behavior. Despite its significance, previous studies have been hindered by harsh environmental conditions and limited seismic station coverage, resulting in incomplete earthquake catalogs and insufficient analysis of fluid-induced seismic activity. This study addresses these gaps by constructing a high-resolution earthquake catalog for the EHS over 20 months (2023–2024) using deep learning and template matching techniques. Key findings include the identification of three major earthquake swarms (Bianba, Bomi, and Luolong), each exhibiting distinct spatiotemporal evolution patterns and fault geometries. The study reveals that fluid diffusion and aseismic slip are primary drivers of swarm activity, with complex fault geometries and permeability structures playing a critical role. The Bianba swarm showed multiple migration fronts with varying fluid diffusion rates, while the Bomi swarm demonstrated characteristics of aseismic slip-driven activity. Stress perturbations and Coulomb stress interactions were found to significantly influence seismicity patterns, especially in the Luolong swarm. This manuscript provides a unique contribution by integrating advanced seismic analysis methods to elucidate the mechanisms driving swarm evolution in a tectonically and geothermally complex region. The findings have implications for understanding the interplay between fluids, faults, and seismic activity in geologically dynamic settings.

Session: Advanced Geophysical Observations, Analytical Methods, and New Insights for Earthquake Swarms [Poster]

Type: Poster

Date: 4/15/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Jin-zhi

Student Presenter: Yes

Invited Presentation: 

Poster Number: 114

Authors