Skip to Main content Skip to Navigation
Journal articles

Global and Interregion Characterization of Subduction Interface Earthquakes Derived From Source Time Functions Properties

Abstract : Source time functions (STFs) describe how the seismic moment rate is released with time, and carry information on integral rupture properties, such as static stress drop and radiated energy. In this study, we systematically analyze a set of 1,433 STFs extracted from the SCARDEC method (Vallée and Douet, 2016,, containing the Mw≥5.6, shallow (z≤70 km) earthquakes with dip-slip mechanism that occurred between 1992 and 2014. At the global scale, STFs properties indicate scale invariance of stress drop and scaled radiated energy with magnitude. In a second step, these source parameters are investigated in light of the tectonic context of the earthquakes: in agreement with other approaches, we observe that subduction interface earthquakes have lower stress drop and scaled radiated energy relative to all other earthquakes (e.g., crustal earthquakes). Finally, a focus on subduction interface earthquakes (approximately 800 earthquakes) is done by considering 18 regional segments of subduction zones. We find that these segments do not have the same signature in terms of macroscopic rupture properties, which means that large-scale plate convergence and mechanical properties influence rupture behavior. In a given segment, local heterogeneities of stress drop or radiated energy can be associated with local features of the subduction zone: in particular, we find that low coupled zones generate earthquakes with low stress drop and scaled radiated energy. This last feature, also observed at a larger scale, suggests a positive correlation between coupling and stress drop.
Document type :
Journal articles
Complete list of metadata
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, February 25, 2022 - 5:06:21 PM
Last modification on : Sunday, February 27, 2022 - 3:08:31 AM
Long-term archiving on: : Thursday, May 26, 2022 - 8:10:48 PM


JGR Solid Earth - 2018 - Choun...
Publisher files allowed on an open archive





Agnès. Chounet, Martin Vallée. Global and Interregion Characterization of Subduction Interface Earthquakes Derived From Source Time Functions Properties. Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2018, 123, pp.5831-5852. ⟨10.1029/2018JB015932⟩. ⟨insu-03589343⟩



Record views


Files downloads