Bimaterial effect and favorable energy ratio enabled supershear rupture in the 2025 Mandalay earthquake.
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| Title: | Bimaterial effect and favorable energy ratio enabled supershear rupture in the 2025 Mandalay earthquake. |
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| Authors: | Xu, Liuwei (AUTHOR), Meng, Lingsen (AUTHOR), Yunjun, Zhang (AUTHOR), Yang, Yanchen (AUTHOR), Wang, Yidi (AUTHOR), Hu, Changyang (AUTHOR), Weng, Huihui (AUTHOR), Xu, Wenbin (AUTHOR), Su, Elizabeth (AUTHOR), Ji, Chen (AUTHOR) |
| Source: | Science. 10/30/2025, Vol. 390 Issue 6772, p476-481. 6p. |
| Subjects: | Earthquakes, Geologic faults, Soil liquefaction, Ground motion, Building failures, Seismic wave studies |
| Geographic Terms: | Myanmar |
| Abstract: | Joint seismic and geodetic analyses revealed that the 2025 moment magnitude (Mw) 7.8 Mandalay, Myanmar, earthquake ruptured ~510 km of the Sagaing fault, with a sustained supershear rupture extending ~450 km on the southern branch. Far-field Mach waves and near-field ground motion confirmed the supershear nature. This exceptionally long supershear rupture caused building collapse and soil liquefaction, as observed in satellite imagery, offering insights into the damage potential of such ruptures in urban areas. Sustained supershear propagation was facilitated by the fault's linear geometry, prolonged interseismic quiescence, favorable energy ratio, and pronounced bimaterial contrasts across the fault interface. These findings underscore the roles of fault structure, stress accumulation, and material contrasts in governing rupture dynamics, demonstrating that large-scale supershear propagation can occur in interplate continental fault systems. [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | Joint seismic and geodetic analyses revealed that the 2025 moment magnitude (Mw) 7.8 Mandalay, Myanmar, earthquake ruptured ~510 km of the Sagaing fault, with a sustained supershear rupture extending ~450 km on the southern branch. Far-field Mach waves and near-field ground motion confirmed the supershear nature. This exceptionally long supershear rupture caused building collapse and soil liquefaction, as observed in satellite imagery, offering insights into the damage potential of such ruptures in urban areas. Sustained supershear propagation was facilitated by the fault's linear geometry, prolonged interseismic quiescence, favorable energy ratio, and pronounced bimaterial contrasts across the fault interface. These findings underscore the roles of fault structure, stress accumulation, and material contrasts in governing rupture dynamics, demonstrating that large-scale supershear propagation can occur in interplate continental fault systems. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00368075 |
| DOI: | 10.1126/science.ady6100 |
