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An exponential build-up in seismic energy suggests a months-long nucleation of slow slip in Cascadia
Abstract : Slow slip events result from the spontaneous weakening of the subduction megathrust and bear strong resemblance to earthquakes, only slower. This resemblance allows us to study fundamental aspects of nucleation that remain elusive for classic, fast earthquakes. We rely on machine learning algorithms to infer slow slip timing from statistics of seismic waveforms. We find that patterns in seismic power follow the 14-month slow slip cycle in Cascadia, arguing in favor of the predictability of slow slip rupture. Here, we show that seismic power exponentially increases as the slowly slipping portion of the subduction zone approaches failure, a behavior that shares a striking similarity with the increase in acoustic power observed prior to laboratory slow slip events. Our results suggest that the nucleation phase of Cascadia slow slip events may last from several weeks up to several months.
Littérature citée [47 références]
https://hal-ens.archives-ouvertes.fr/hal-02944755
Contributeur : Romain Jolivet Connectez-vous pour contacter le contributeur
Soumis le : vendredi 2 octobre 2020 - 08:59:09
Dernière modification le : vendredi 18 mars 2022 - 11:54:02
Archivage à long terme le : : lundi 4 janvier 2021 - 08:43:30
Contributeur : Romain Jolivet Connectez-vous pour contacter le contributeur
Soumis le : vendredi 2 octobre 2020 - 08:59:09
Dernière modification le : vendredi 18 mars 2022 - 11:54:02
Archivage à long terme le : : lundi 4 janvier 2021 - 08:43:30
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