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Sampling the Earthquake Cycle in a Graben System: Insights from the 2025 Mw7.1 Dingri Earthquake in the Southern Tibetan Plateau

Description: 

Earthquakes result from complex spatial and temporal interactions between fault slip and tectonic loading through seismic cycles. However, high-quality deformation and fault slip observations spanning the entire earthquake cycle are rare, limiting our understanding of fundamental earthquake physics. Here, we integrate geodetic and seismic observations to analyze the inter-, co-, and post-seismic deformation and fault slip associated with the 2025 Mw7.1 Dingri earthquake that occurred along the Ama Drime Graben (ADG) in southern Tibet. Our result shows that the mainshock ruptured unilaterally towards north with a maximum rupture speed of ~3 km/s, primarily on the twisted, branching fault segments along the eastern edge of the graben. The strongest high frequency seismic waves were radiated from the transition of deep to shallow slip to the north of the epicenter. The dynamic waves from early rupture triggered the rupture at 3-5 km depth on a fault segment along the western edge of the graben, which is part of the ~200 km long fault that has shallow creep at a rate of ~1.5 mm/year during inter-seismic period. Shallow post-seismic slip was promoted on this fault segment, with slip complementary to its co-seismic rupture. Fault segments have the largest coseismic slip triggered afterslip on nearby secondary faults, as well as deep afterslip and viscoelastic relaxation. A wide range of fault friction properties and complex fault geometry is needed to reconcile these observations, mapping them is critical to identify potential rupture zones for future damaging earthquakes.

Session: Late-breaking on Recent and Future Large Earthquakes - I

Type: Oral

Date: 4/15/2025

Presentation Time: 11:15 AM (local time)

Presenting Author: Shengji

Student Presenter: No

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