%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Leon-Rios, S.
%A Rietbrock, A.
%A Bie, L. D.
%A Beck, S.
%A Charvis, Philippe
%A Comte, D.
%A Galve, A.
%A Meltzer, A.
%A Roecker, S.
%A Ruiz, M.
%A Segovia, M.
%T Physical properties controlling earthquake ruptures : two study cases along the South American Subduction Zone
%D 2025
%L fdi:010094399
%G ENG
%J Geophysical Research Letters
%@ 0094-8276
%K tomography ; seismology ; subduction zone ; seismic slip
%K EQUATEUR ; CHILI ; AMERIQUE DU SUD ; PEDERNALES ; ANTOFAGASTA
%M ISI:001536276100001
%N 14
%P e2025GL114615 [12 ]
%R 10.1029/2025gl114615
%U https://www.documentation.ird.fr/hor/fdi:010094399
%> https://www.documentation.ird.fr/intranet/publi/2025-09/010094399.pdf
%V 52
%W Horizon (IRD)
%X Seismic velocity models were compared with coseismic slip distributions for two megathrust earthquakes that occurred along the South American subduction zone. By analyzing the distribution of Vp/Vs ratios, we found that seismic anomalies with values higher or lower than the average coincide with the boundaries of the earthquake ruptures. In contrast, the regions characterized by intermediate Vp/Vs values may represent a mechanical "sweet spot" where the physical properties create favorable conditions for sustained rupture propagation. Our methodology, which combines the Vp/Vs distribution and the analysis of coseismic slip models, could reveal the rupture-prone regions and the likely magnitude of potential earthquakes, providing relevant information for seismic hazard assessment.
%$ 066