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Asymmetric and Intermittent Supershear Rupture Mediated by Local Fault Complexity during the 2025 MW 7.7 Myanmar
Tao Xia1, Lingling Ye1, Jinlai Hao2
1Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China.
The 2025 Myanmar earthquake
Area of Science:
- Seismology
- Earthquake rupture dynamics
Background:
- The 2025 Myanmar earthquake (Mw 7.7) occurred on the Sagaing fault.
- Understanding earthquake rupture processes is crucial for seismic hazard assessment.
Purpose of the Study:
- To determine the detailed rupture process of the 2025 Myanmar earthquake.
- To investigate the influence of fault complexity and stress heterogeneity on rupture behavior.
Main Methods:
- Joint inversion of near-fault strong-motion, geodetic, and teleseismic data.
- Analysis of rupture initiation, propagation, slip distribution, and speed.
Main Results:
- Rupture initiated with significant slip (~5 m) near the epicenter.
- Northward rupture was subshear; southward rupture propagated ~380 km, exhibiting intermittent supershear episodes.
- Slip exceeding 3 m occurred above a 15 km locking depth; average static stress drop was 4.7 MPa.
Conclusions:
- Localized fault structure and stress heterogeneity controlled slip distribution and rupture speed.
- The Sagaing fault's stress accumulation promotes localized ruptures and occasional rupture cascades with supershear behavior.
- North-south asymmetry in slip duration suggests modulation by fault geometry and rigidity variations.
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