Volume 32 Issue 2
Apr.  2026
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ZHANG C C，WAN Y G，GUAN Z X，et al.，xxxx. The stress changes of the 2025 Dingri M 6.8 earthquake on the surrounding areas[J]. Journal of Geomechanics，x（x）：1−14 doi: 10.12090/j.issn.1006-6616.2025072
Citation: ZHANG C C，WAN Y G，GUAN Z X，et al.，xxxx. The stress changes of the 2025 Dingri M 6.8 earthquake on the surrounding areas[J]. Journal of Geomechanics，x（x）：1−14 doi: 10.12090/j.issn.1006-6616.2025072
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The stress changes of the 2025 Dingri M 6.8 earthquake on the surrounding areas

doi: 10.12090/j.issn.1006-6616.2025072
  • 1.

    School of Geosciences, Institute of Disaster Prevention, Sanhe 065201, Hebei, China

  • 2.

    Hebei Key Laboratory of Earthquake Dynamics, Sanhe 065201, Hebei, China

  • 3.

    School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China

Funds:  This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 42174074, 42364005, and 41674055) and the Special Fund for Scientific Research of Central Universities (Grant No. ZY20260307).
More Information
  • Received: 2025-06-19
  • Revised: 2025-09-28
  • Accepted: 2025-09-30
    • Available Online: 2025-12-18
  • Published: 2026-04-28
    Abstract
  •   Objective  The Dingri area in Xizang is located within the Lhasa Block of the Qinghai–Xizang Plateau. It belongs to the core region of the Southern Tibetan Rift System and is a key zone with high seismic activity and earthquake potential. The M 6.8 earthquake that struck Dingri, Xizang (28.50°N, 87.45°E) on January 7, 2025, was the largest ever recorded in this area. Although previous studies have clarified the seismogenic structure and rupture distribution of this earthquake, few studies have addressed its impact on the surrounding areas. Therefore, this study calculates the co-seismic displacement and horizontal strain fields generated by the earthquake and the changes in Coulomb failure stress induced on surrounding faults. The study identifies high-risk fault segments and provides a scientific basis for regional seismic hazard assessment, monitoring, and early warning.   Methods  The local stress field was projected onto two potential nodal planes of the earthquake determined by the central focal mechanism solution; Nodal Plane I (strike 184.37°, dip 47.67°, rake –78.10°) was found to be more prone to rupture. This plane was identified as the seismogenic fault plane when combined with the strike of the local fault. Then, based on the seismic rupture model and the homogeneous elastic half-space model, the co-seismic surface displacement field and the horizontal strain field were calculated. Furthermore, according to the data on the geometry and slip properties of faults near the epicenter, the study systematically quantified the impact of the earthquake on the Coulomb stress of major surrounding faults.   Results  In terms of horizontal displacement, the materials on the east and west sides of the epicenter moved outward, while materials in some northern areas converged toward the epicenter, with a maximum horizontal displacement of 76.65 cm. In terms of vertical displacement, subsidence occurred on the north side of the epicenter (with a maximum of 83.97 cm) and uplift occurred on the northeast side (with a maximum of 33.25 cm), showing an obvious normal fault mechanism near the seismogenic fault. Volumetric strain and areal strain exhibited consistent distribution patterns; both exhibited tension on the north and south sides of the epicenter (with maxima of 1.768×10−6 and 1.737×10−6, respectively) and compression around the epicenter as well as on the east and west sides (with maxima of 1.874×10−6 and 1.987×10−6, respectively). Coulomb failure stress induced by this earthquake on the major surrounding faults at a depth of 10 km showed that the Dengmecuo Fault experienced significant stress unloading. This was the most intense stress release among all faults, effectively releasing regional tectonic stress and confirming that the Dengmecuo Fault is the seismogenic fault. The maximum Coulomb stress increment of the southern segment of the Shenza–Dingjie Fault was 0.0349 MPa, and that of the eastern segment of the Lazi–Qiongdoujiang Fault was 0.0191 MPa. Both exceeded the triggering threshold of 0.01 MPa, indicating high seismic hazard.  Conclusion  The study shows that this earthquake was a normal-faulting earthquake under the regional tectonic stress field and the Dengmecuo Fault was the seismogenic structure. Significant changes occurred in the co-seismic displacement field and the horizontal strain field around the epicenter. The Coulomb stress increments of the southern segment of the Shenza–Dingjie Fault and the eastern segment of the Lazi–Qiongdoujiang Fault exceeded the triggering threshold, indicating that moderate to strong earthquakes are possible in these segments in the future, which requires high attention. [Significance] By analyzing the impact of the January 7, 2025, M 6.8 Dingri earthquake in Xizang on the Coulomb stress of major faults in southern Xizang, this study identified the high-risk fault segments that need focused attention, providing a valuable reference for subsequent seismic monitoring and early warning.

     

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