Seismic Source Complexities Revealed by InSAR and Analytical Modeling: The 2025 Mw 7.1 Dingri Earthquake.
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| Title: | Seismic Source Complexities Revealed by InSAR and Analytical Modeling: The 2025 Mw 7.1 Dingri Earthquake. |
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| Authors: | Puliero, Silvia1 (AUTHOR), Ruocco, Valerio1,2,3 (AUTHOR) valerio.ruocco@studentmail.unicas.it, Atzori, Simone1,3 (AUTHOR), Tolomei, Cristiano1 (AUTHOR), Albano, Matteo1,2 (AUTHOR), Moro, Marco1,3 (AUTHOR), Antonioli, Andrea1 (AUTHOR), Stramondo, Salvatore1 (AUTHOR), Saroli, Michele1,2,3 (AUTHOR) |
| Source: | Remote Sensing. Jun2026, Vol. 18 Issue 11, p1751. 24p. |
| Subjects: | Radar interferometry, Earthquakes, Geologic faults, Fault zones, Surface fault ruptures, Structural geology, Stress concentration |
| Geographic Terms: | Tibet (China) |
| Abstract: | Highlights: Using InSAR data, this study reveals that the Mw 7.1 Dingri earthquake ruptured four distinct fault segments, including a listric primary fault and an antithetic fault. The activation of multiple segments highlights the complexity of rupture processes and provides new insights into fault interactions and seismic hazard in extensional tectonic regions. What are the main findings? The Mw 7.1 Dingri earthquake involved a complex rupture activating four distinct fault segments, including a primary north–south listric fault and three secondary fault segments, as revealed by joint inversion of multi-sensor InSAR (Sentinel-1, ALOS-2) and GNSS observations. Coseismic slip distribution revealed predominantly normal faulting with a minor left-lateral component, while ΔCFF stress analysis supports the simultaneous activation of secondary segments during the mainshock. What are the implications of the main findings? The study demonstrates the ability of InSAR to resolve complex, multi-segment earthquake ruptures, including the antithetic fault and the other two secondary fault segments. Understanding synchronous multi-segment activation improves seismic hazard assessment in extensional regions and highlights the importance of integrating geodetic observations, photogeological interpretation, and stress transfer analyses for detailed rupture characterization. This study investigates the Mw 7.1 earthquake that struck the Southern Tibetan Plateau (Xizang) on 7 January 2025, using joint Interferometric Synthetic Aperture Radar (InSAR) observations and inverse modeling to characterize the fault geometry and slip distribution. Coseismic interferograms derived from Sentinel-1 and ALOS-2 data reveal complex surface deformation patterns, indicating rupture along four distinct fault segments. This configuration provides a more detailed fault segmentation than proposed in previous studies, featuring predominantly normal faulting on a north–south-trending structure consistent with regional extensional tectonics. Integrated analysis of coseismic deformation, source modeling, and Coulomb Failure Function (ΔCFF) stress changes suggests that the three secondary fault segments were potentially activated synchronously with the mainshock, in addition to the principal rupture. The results underscore the complexity of the seismic source and document the activation of an antithetic fault segment, for which the InSAR observations provide compelling quantitative evidence. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Highlights: Using InSAR data, this study reveals that the Mw 7.1 Dingri earthquake ruptured four distinct fault segments, including a listric primary fault and an antithetic fault. The activation of multiple segments highlights the complexity of rupture processes and provides new insights into fault interactions and seismic hazard in extensional tectonic regions. What are the main findings? The Mw 7.1 Dingri earthquake involved a complex rupture activating four distinct fault segments, including a primary north–south listric fault and three secondary fault segments, as revealed by joint inversion of multi-sensor InSAR (Sentinel-1, ALOS-2) and GNSS observations. Coseismic slip distribution revealed predominantly normal faulting with a minor left-lateral component, while ΔCFF stress analysis supports the simultaneous activation of secondary segments during the mainshock. What are the implications of the main findings? The study demonstrates the ability of InSAR to resolve complex, multi-segment earthquake ruptures, including the antithetic fault and the other two secondary fault segments. Understanding synchronous multi-segment activation improves seismic hazard assessment in extensional regions and highlights the importance of integrating geodetic observations, photogeological interpretation, and stress transfer analyses for detailed rupture characterization. This study investigates the Mw 7.1 earthquake that struck the Southern Tibetan Plateau (Xizang) on 7 January 2025, using joint Interferometric Synthetic Aperture Radar (InSAR) observations and inverse modeling to characterize the fault geometry and slip distribution. Coseismic interferograms derived from Sentinel-1 and ALOS-2 data reveal complex surface deformation patterns, indicating rupture along four distinct fault segments. This configuration provides a more detailed fault segmentation than proposed in previous studies, featuring predominantly normal faulting on a north–south-trending structure consistent with regional extensional tectonics. Integrated analysis of coseismic deformation, source modeling, and Coulomb Failure Function (ΔCFF) stress changes suggests that the three secondary fault segments were potentially activated synchronously with the mainshock, in addition to the principal rupture. The results underscore the complexity of the seismic source and document the activation of an antithetic fault segment, for which the InSAR observations provide compelling quantitative evidence. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20724292 |
| DOI: | 10.3390/rs18111751 |
