AtypicSSE : Exploring complex aseismic slip beyond typical sizes and durations

Durée : 2017 - 2021
Coordinatrice : Anne Socquet

Objectives and scientific hypotheses
The goal is to develop methods using GPS and seismic waveforms to detect and characterize Slow Slip Events (SSEs) that are too small, either in spatial extent and / or in slip rate, for the current processing methods. This should extend our view on how (ie, where and when) slow slip occurs in non-tremorgenic subduction zones, both at the short (eg, day) and long (months to years) time scales. We believe that the resolution of such weak SSEs, and hence the accumulation of new slow slip observations, is a pre-requisite to a better understanding of how the seismic and aseismic segments of the subduction interact.
Based on these observations, we will investigate how aseismic slip can trigger earthquakes, and how this triggering depends on depth, duration, migration, periodicity / smoothness (i.e., whether the slow slip occurs at once or over several episodes), and total slip of the SSEs.