Work

Supershear Rupture Indicator in Near-fault Particle Motion

Year: 2026

Type: preprint

Abstract: Earthquake rupture propagation speed is an essential source parameter that fundamentally controls hazard and risk. In this paper, we develop and demonstrate the capability of a single near-fault seismic record in delineating earthquake rupture speed by inspecting displacement particle motion. We apply this method to near-fault strong-motion data in M7+ strike-slip earthquakes and identify diverse particle-motion signatures associated with subshear rupture, supershear rupture, supershear transition, initial rupture expansion, and potential multiple rupture fronts. This study highlights the value of near-fault observations for determining rupture speed.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2606.10843

Authors: Yao, Suli, yang, Hongfeng, Bhat, Harsha S., Aochi, Hideo

Institutions: Centre National de la Recherche Scientifique, Chinese University of Hong Kong, Université Paris Sciences et Lettres, Laboratoire de Géologie de l’École Normale Supérieure, Bureau de Recherches Géologiques et Minières

Language: English

Topic: earthquake and tectonic studies

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: green

Funders: California Institute of Technology, Agence Nationale de la Recherche

Award: Smectite dehydration: a key to fault mechanics?

OpenAlex ID: W7164163495

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