Analysis of the GNSS deformation of the 2025 Xizang Dingri <i>M</i>6.8 earthquake

Analysis of the GNSS deformation of the 2025 Xizang Dingri M6.8 earthquake

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Xiaofei Lu^a^,^b^,^c, Caihong Zhang^a^,^b^,^c, Kai Tan^a^,^b^,^c^,^*, Yong Huang^a^,^b^,^c, Chengtao Li^a^,^b^,^c

Geodesy and Geodynamics | 2026, 17(3) : 383 - 390

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Geodesy and Geodynamics | 2026, 17(3): 383-390

• Research Paper •

Analysis of the GNSS deformation of the 2025 Xizang Dingri M6.8 earthquake

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Xiaofei Lu^a^,^b^,^c, Caihong Zhang^a^,^b^,^c, Kai Tan^a^,^b^,^c^,^*, Yong Huang^a^,^b^,^c, Chengtao Li^a^,^b^,^c

Affiliations

^aInstitute of Seismology, China Earthquake Administration, Wuhan 430071, China

^bWuhan Gravitation and Solid Earth Tides National Observation and Research Station, Wuhan 430071, China

^cHubei Earthquake Administration, Wuhan 430071, China

Xiaofei Lu is an Assistant Researcher at the Institute of Seismology, China Earthquake Administration, Wuhan, China, specializing in GNSS crustal deformation research.

Published: 2026-05-10 doi: 10.1016/j.geog.2025.09.007

Outline

Abstract

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The study utilized GNSS observation data from 1999 to 2024 to investigate the crustal deformation characteristics near the epicenter of the Dingri earthquake. The results show that the GNSS horizontal velocity value at the Dingri earthquake epicenter is about 25.9 mm/year, and the vertical velocity value is close to zero. The vertical velocity field indicates that most of the study area is subsiding, while the rift area is uplifting, and the Shenzha-Dingjie fault zone is in an uplifting area with a significant uplift gradient. The maximum shear strain rate and the second invariant of the strain tensor at the epicenter are 36 × 10^-9/year and 56 × 10^-9/year, respectively. The surface expansion rate field suggests that the earthquake occurred in a region of compressive deformation. The historical earthquake stress change distribution indicates that the Coulomb stress change loading value at the epicenter of the Dingri earthquake is 1.549 bar, exceeding the stress triggering threshold. This indicates that historical earthquakes promoted the occurrence of this event. The central and western sections of the South Tibetan Detachment System fault zone and the middle section of the Shenzha-Dingjie fault zone are located in high-strain value areas and postseismic stress loading regions. The seismic risk in this region should be closely monitored in the future.

Key words

Crustal deformation / Strain rate field / Dingri earthquake / Coulomb failure stress

Cite this Article

Xiaofei Lu, Caihong Zhang, Kai Tan, Yong Huang, Chengtao Li. Analysis of the GNSS deformation of the 2025 Xizang Dingri M6.8 earthquake[J]. Geodesy and Geodynamics, 2026 , 17 (3) : 383 -390 . DOI: 10.1016/j.geog.2025.09.007

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Funding

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Scientific Research Fund from Institute of Seismology, CEA and National Institute of Natural Hazards, Ministry of Emergency Management of China(IS202426353)
Open Fund of Wuhan, Gravitation and Solid Earth Tides, National Observation and Research Station(WHYWZ202218; WHYWZ202405)
Hubei Provincial Natural Science Foundation of China(2025AFB703)
China Earthquake Administration Monitoring and Forecasting Department Seismic Situation Tracking Oriented Work Project(2024010218)

Appendix

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Year 2026 volume 17 Issue 3

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Cite this Article

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Article Info

doi: 10.1016/j.geog.2025.09.007

Receive Date：2025-06-08
Online Date：2026-07-23
Published：2026-05-10

Article Data

Affiliations

History

Received：2025-06-08
Revised：2025-09-19
Accepted：2025-09-21

Funding

Scientific Research Fund from Institute of Seismology, CEA and National Institute of Natural Hazards, Ministry of Emergency Management of China(IS202426353)

Open Fund of Wuhan, Gravitation and Solid Earth Tides, National Observation and Research Station(WHYWZ202218; WHYWZ202405)

Hubei Provincial Natural Science Foundation of China(2025AFB703)

China Earthquake Administration Monitoring and Forecasting Department Seismic Situation Tracking Oriented Work Project(2024010218)

Affiliations

^aInstitute of Seismology, China Earthquake Administration, Wuhan 430071, China

^bWuhan Gravitation and Solid Earth Tides National Observation and Research Station, Wuhan 430071, China

^cHubei Earthquake Administration, Wuhan 430071, China

Corresponding:

^* Corresponding author. Institute of Seismology, China Earthquake Administration, Wuhan 430071, China. E-mail address: whgpstan@163.com (K. Tan).

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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