Year: 2025
Type: preprint
Abstract: We present a direct measurement of the slip-rate function from a natural coseismic rupture, recorded on March 28, 2025, during the $M_w$ 7.7 Mandalay earthquake (Myanmar). This measurement was made on video footage of the surface rupture captured by a security camera located only meters away from the fault trace. Using direct image analysis, we measured the relative slip at each time step and deduced the slip rate. Our results show a local slip duration of 1.4 s and cumulative slip of $\sim$3 m, during which surface slip velocity peaked at $\sim$3.5 m/s with passage of the rupture front. These findings demonstrate the pulse-like nature of the seismic rupture, at the location of the recording. Using slip-pulse elastodynamic rupture models, we obtain the complete mechanical properties of this pulse, including the energy release rate.
Source: arXiv (Cornell University)
Institutions: Centre National de la Recherche Scientifique, Observatoire Midi-Pyrénées, Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, École nationale des ponts et chaussées, Laboratoire Navier, Institut Polytechnique de Paris, Université Gustave Eiffel, Université Paris Sciences et Lettres, École Normale Supérieure - PSL, Laboratoire de Géologie de l’École Normale Supérieure, Université Côte d'Azur, Observatoire de la Côte d’Azur, Géoazur, Institut de Recherche pour le Développement, Edison International (United States)
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
Funder: European Commission
Awards: G423921289, G8012088687
OpenAlex ID: W6979325989
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