Study models coseismic slip in northeastern Taiwan, suggesting tectonic implications for seismic hazards.
Understanding deformation patterns and rupture sources near the junction of the Ryukyu trench and the Longitudinal Valley in northeastern Taiwan is critical for seismic hazard assessment. We model the coseismic slip of the 2024 Mw 7.3 Hualien earthquake using onshore and seafloor geodetic data together with relocated seismicity. The rupture involves a deep 70° east-dipping Longitudinal Valley fault and a 35° west-dipping offshore fault, with maximum slips of 2.3 and 1.1 m, respectively. These faults released comparable amounts of geodetic moment, each equivalent to an Mw 7.1 event. The 2024 event and preceding offshore damaging earthquakes suggest that structures offshore Hualien accommodate a substantial portion of plate convergence. This interpretation is further supported by the sharp decrease in Global Navigation Satellite System secular velocities and shortening rates, as well as the seaward propagation of the Central Range fault from southern to northern Longitudinal Valley.
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Hsu et al. (2026) studied this question.
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