The 2025 Ms6.8 (Mw 7.1) Dingri Earthquake Sequence and Seismogenic Structure
Description:
The 2025 Ms6.8 (Mw7.1) earthquake was a typical north-south normal faulting event within the Tethyan Himalaya of the Tibetan Plateau. Using a back-projection method, we analyzed the rupture process of the mainshock, which primarily propagated northward from the epicenter. The rupture extended approximately 50 km and lasted around 25 seconds. Additionally, China University of Geosciences (Wuhan) deployed a dense seismic array after the earthquake, capturing extensive seismic records. Based on this high-density dataset, we applied a AI method (PhaseNet) to automatically detect P- and S-wave phases. After phase association and precise event location, we obtained a high-resolution aftershock catalog that clearly delineates the spatial distribution of the earthquake sequence's fault plane.
The spatial distribution of aftershocks not only outlines the mainshock rupture plane but also reveals activity along subsidiary faults. For example, near Changsuo Village, a NNW-trending fault branches off from the main rupture, which is identified as an antithetic fault based on spatial patterns. Another interesting feature is that south of the epicenter, the aftershock-defined fault plane dips northeast, whereas north of the epicenter, it dips westward. These two fault planes intersect near the epicenter. Preliminary focal mechanism solutions further highlight the complexity of this earthquake sequence, with the NNW-trending fault at Changsuo Village exhibiting a normal faulting component with right-lateral strike-slip motion, while an SSW-trending fault south of the epicenter appears to have a left-lateral strike-slip component. A detailed study of source parameters based on dense seismic array data will provide deeper insights into the fault geometry and local stress conditions.
Session: Late-breaking on Recent and Future Large Earthquakes - I
Type: Oral
Date: 4/15/2025
Presentation Time: 11:00 AM (local time)
Presenting Author: Dun
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Dun Wang Presenting Author Corresponding Author wangdun@cug.edu.cn China University of Geosciences (Wuhan) |
Dongdong Yao yaodongdong@cug.edu.cn China University of Geosciences (Wuhan) |
Fang Chen Fangchen@cug.edu.cn China University of Geosciences (Wuhan) |
Zhifeng Wang wzf2969069625@163.com China University of Geosciences (Wuhan) |
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The 2025 Ms6.8 (Mw 7.1) Dingri Earthquake Sequence and Seismogenic Structure
Category
Late-breaking on Recent and Future Large Earthquakes