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Título

Trench-parallel ridge subduction controls upper-plate structure and shallow megathrust seismogenesis along the Jalisco-Colima margin, Mexico

AutorPrada, Manel CSIC ORCID ; Bartolomé, Rafael CSIC ORCID CVN ; Gras Andreu, Claudia; Bandy, William; Dañobeitia, Juan José CSIC ORCID
Fecha de publicaciónfeb-2023
EditorNature Publishing Group
CitaciónCommunications Earth & Environment 4: 53 (2023)
ResumenThe parameters allowing for near-trench megathrust ruptures are debated and commonly involve the presence of site-dependent tectonic factors (e.g. rough subducting topography, amount of sediments), implying the need for direct geophysical observations. Here we use seismic imaging techniques to explore the mechanisms triggering shallow ruptures in the Rivera subduction zone, along the non-accretionary Jalisco-Colima continental margin, W Mexico, where three large (Mw~8) tsunamigenic megathrust earthquakes occurred in the last century. The seismic image reveals large interplate topographic variations morphologically alike to incoming trench-parallel ridges seaward of the study area. Ridge subduction only occurs along the southern non-accretionary margin of the Rivera system, where past earthquakes released large near-trench coseismic energy, indicating that subducting ridges enhance interplate coupling. Subducting ridges uplift the margin, causing upper-plate fracturing and low rigidity areas. Such elastic structure quantitatively explains the dynamics of slow and tsunamigenic ruptures in the past. We conclude that ridge subduction beneath the Jalisco-Colima continental margin promotes shallow seismogenesis and explains the large tsunamigenic potential of the area
Descripción8 pages, 4 figures, supplementary information https://doi.org/10.1038/s43247-023-00705-9.-- Data availability: Raw ocean-bottom seismometer can be found here: https://doi.org/10.6084/m9.figshare.21388122. The Multichannel PSDM seismic section can be found here: https://doi.org/10.6084/m9.figshare.21388107.v1. .-- Code availability: Travel-time tomography was performed using a modified version of TOMO2D48,49, available upon request to the corresponding author. Multichannel seismic data were processed with commercial software RadEXPro (https://radexpro.com/).
Versión del editorhttps://doi.org/10.1038/s43247-023-00705-9
URIhttp://hdl.handle.net/10261/305369
DOI10.1038/s43247-023-00705-9
E-ISSN2662-4435
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