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Possible Precursory Slow‐Slip to Two M L ∼3 Mainevents of the Diemtigen Microearthquake Sequence, Switzerland

2021; American Geophysical Union; Volume: 48; Issue: 19 Linguagem: Inglês

10.1029/2021gl093783

1944-8007

Verena Simon, Toni Kraft, Tobias Diehl, Thessa Tormann,

High-pressure geophysics and materials

Abstract How earthquakes initiate is still a largely debated question in earthquake science. On the lab scale, rupture initiation is well studied, and detailed models of how rupture nucleation evolves have been developed. Contrarily, for real earthquakes, only a few high‐resolution observations of this process are available today, mostly limited to mainshock magnitudes > M5. Consequently, there is still no consensus on whether and how laboratory results can be transferred to real earthquakes. Here we show that rupture nucleation phenomena observed on the lab scale can also be imaged on the microearthquake‐scale with little instrumental effort. Our results highlight the potential of the applied analysis workflow to significantly improve the observation quality of seismicity patterns and immediate foreshock phenomena in microearthquake sequences. Our approach can help to narrow the existing observational gap to the lab scale and may contribute to a better understanding of the mechanisms of earthquake initiation in the future.