Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866913970883919872 |
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| author | Hirano, Shiro Doke, Ryosuke Maeda, Takuto |
| author_facet | Hirano, Shiro Doke, Ryosuke Maeda, Takuto |
| contents | We investigated the rupture dynamics of the 2025 $M_w$7.7 Mandalay, Myanmar earthquake, using a video recording of surface rupture, strong motion recordings, waveform simulation, and satellite imagery. Our assessment, based on the S-wave observation in the video and rupture arrival time at a seismic station 246 km south of the hypocenter, suggests that rupture decelerated to subshear speeds ($\sim$3 km/s) from initial supershear propagation ($\sim$6 km/s) before reaching the camera location. This deceleration is also supported by comparison between the fault-normal acceleration patterns seen in the video and that simulated by kinematic rupture modeling. Additionally, satellite imagery indicated a local minimum in slip (2$-$3 m) approximately 40$-$60 km south of the epicenter, suggesting a region of reduced stress drop that likely caused the temporary deceleration. Beyond this point, the rupture appears to have re-established supershear propagation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_09652 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar Hirano, Shiro Doke, Ryosuke Maeda, Takuto Geophysics We investigated the rupture dynamics of the 2025 $M_w$7.7 Mandalay, Myanmar earthquake, using a video recording of surface rupture, strong motion recordings, waveform simulation, and satellite imagery. Our assessment, based on the S-wave observation in the video and rupture arrival time at a seismic station 246 km south of the hypocenter, suggests that rupture decelerated to subshear speeds ($\sim$3 km/s) from initial supershear propagation ($\sim$6 km/s) before reaching the camera location. This deceleration is also supported by comparison between the fault-normal acceleration patterns seen in the video and that simulated by kinematic rupture modeling. Additionally, satellite imagery indicated a local minimum in slip (2$-$3 m) approximately 40$-$60 km south of the epicenter, suggesting a region of reduced stress drop that likely caused the temporary deceleration. Beyond this point, the rupture appears to have re-established supershear propagation. |
| title | Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar |
| topic | Geophysics |
| url | https://arxiv.org/abs/2506.09652 |