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Coseismic and postseismic slip as a likely trigger of a 1 slow slip event (M 5.5) on the Longitudinal Valley
  • Alexandre Canitano,
  • Maxime Godano,
  • Marion Y Thomas
Alexandre Canitano
Institute of Earth Sciences, Academia Sinica

Corresponding Author:[email protected]

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Maxime Godano
Université Côte d'Azur
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Marion Y Thomas
Sorbonne Université, CNRS-INSU
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Using borehole strainmeters, we detected a 13-day long slow slip event on the Longitudinal Valley Fault, Taiwan. It is located between 8 to 15 km depth and has an equivalent moment magnitude of 5.5. The slow event has likely been promoted by the significant Coulomb stress changes (∼ + 1 MPa) imparted by a combination of coseismic and postseismic slip of the M w 6.8 Chengkung earthquake. Besides, insignificant coseismic slip is observed in the slow event region, suggesting that the latter could have acted as a barrier during the Chengkung earthquake. We also found a spatiotemporal correlation between the slow event and a cluster of repeating microearthquakes, suggesting aseismic slip as a possible driven mechanism of repeating ruptures. These results highlight the complex interplay between seismic and aseismic processes along the fault.