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Journal Articles Geophysical Research Letters Year : 2021

Dual seismic migration velocities in seismic swarms

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Pierre Dublanchet
Louis De Barros

Abstract

Fluid induced earthquake sequences generally appear as expanding swarms activating a particular fault. The recent analysis of a swarm in the Corinth rift has revealed a dual migration pattern, with a global slow expansion (m/day) and episodes of rapid migration (km/day). Such swarms are generally interpreted as fluid diffusion, which ignores the possibility of static, dynamic or aseismic triggering, and the existence of rapid migration. Here we propose a new model for such swarms, where earthquakes consist in the failure of asperities on a creeping fault infiltrated by fluid. For that, we couple rate‐and‐state friction, non‐linear diffusivity and elasticity along a 1D interface. This model reproduces the dual migration speeds observed in real swarms. We show that migration speeds increase linearly with the mean pressurization, and are not dependent on the hydraulic diffusivity, as traditionally suggested.
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hal-03052273 , version 1 (19-08-2022)

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Pierre Dublanchet, Louis De Barros. Dual seismic migration velocities in seismic swarms. Geophysical Research Letters, 2021, 48 (1), pp.e2020GL090025. ⟨10.1029/2020GL090025⟩. ⟨hal-03052273⟩
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