Video-based Direct Time Series Measurement of Along-Strike Slip on the Coseismic Surface Rupture During the 2025 Mw7.7 Myanmar Earthquake
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909624088657920 |
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| author | Gao, Jianhao Zheng, Fuhua Wang, Chaofeng Meng, Haoran |
| author_facet | Gao, Jianhao Zheng, Fuhua Wang, Chaofeng Meng, Haoran |
| contents | This study presents a time-resolved analysis of coseismic lateral surface rupture along the Sagaing Fault during the Mw 7.7 Mandalay, Myanmar earthquake on March 28, 2025. Leveraging a publicly available Closed-Circuit Television (CCTV) footage alongside on-site measurements, we show the first in-situ high sampling rate direct measurement of a coseismic slip evolution of a fault during an earthquake. Our work comprises four primary stages: data acquisition, video pre-processing, object tracking, and physical displacement estimation. Video pre-processing includes camera stabilization and distortion correction. We then track pixel-level movements of selected reference points using two complementary computer-vision approaches -- a traditional grayscale template matching algorithm and a state-of-the-art vision transformer multi-object tracking algorithm, and verify both profiles against meticulous manual frame-by-frame measurements, with results that closely match one another. Finally, we translated those pixel displacements into real-world ground movements by calibrating against reference objects whose dimensions were measured on site. Based on the resulting displacement time series, we estimated the critical slip-weakening distance. The resulting high-resolution time series of the along-strike slip, provided in the appendix, offers a critical benchmark for validating dynamic rupture simulations, refining frictional models, and enhancing seismic hazard assessment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_20494 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Video-based Direct Time Series Measurement of Along-Strike Slip on the Coseismic Surface Rupture During the 2025 Mw7.7 Myanmar Earthquake Gao, Jianhao Zheng, Fuhua Wang, Chaofeng Meng, Haoran Geophysics This study presents a time-resolved analysis of coseismic lateral surface rupture along the Sagaing Fault during the Mw 7.7 Mandalay, Myanmar earthquake on March 28, 2025. Leveraging a publicly available Closed-Circuit Television (CCTV) footage alongside on-site measurements, we show the first in-situ high sampling rate direct measurement of a coseismic slip evolution of a fault during an earthquake. Our work comprises four primary stages: data acquisition, video pre-processing, object tracking, and physical displacement estimation. Video pre-processing includes camera stabilization and distortion correction. We then track pixel-level movements of selected reference points using two complementary computer-vision approaches -- a traditional grayscale template matching algorithm and a state-of-the-art vision transformer multi-object tracking algorithm, and verify both profiles against meticulous manual frame-by-frame measurements, with results that closely match one another. Finally, we translated those pixel displacements into real-world ground movements by calibrating against reference objects whose dimensions were measured on site. Based on the resulting displacement time series, we estimated the critical slip-weakening distance. The resulting high-resolution time series of the along-strike slip, provided in the appendix, offers a critical benchmark for validating dynamic rupture simulations, refining frictional models, and enhancing seismic hazard assessment. |
| title | Video-based Direct Time Series Measurement of Along-Strike Slip on the Coseismic Surface Rupture During the 2025 Mw7.7 Myanmar Earthquake |
| topic | Geophysics |
| url | https://arxiv.org/abs/2505.20494 |