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Título: | Large slip, long duration, and moderate shaking of the Nicaragua 1992 tsunami earthquake caused by low near-trench rock rigidity |
Autor: | Sallarès, Valentí CSIC ORCID ; Prada, Manel CSIC ORCID ; Riquelme, Sebastián; Meléndez, Adrià CSIC ORCID ; Calahorrano, Alcinoe CSIC ORCID ; Grevemeyer, Ingo; Ranero, César R. CSIC ORCID | Fecha de publicación: | ago-2021 | Editor: | American Association for the Advancement of Science | Citación: | Science advances 7(32): eabg8659 (2021) | Resumen: | Large earthquake ruptures propagating up to areas close to subduction trenches are infrequent, but when they occur, they heavily displace the ocean seafloor originating destructive tsunamis. The current paradigm is that the large seafloor deformation is caused by local factors reducing friction and increasing megathrust fault slip, or prompting the activation of ancillary faults or energy sources. As alternative to site-specific models, it has been proposed that large shallow slip could result from depth-dependent rock rigidity variations. To confront both hypotheses, here, we map elastic rock properties across the rupture zone of the MS7.0-MW7.7 1992 Nicaragua tsunami earthquake to estimate a property-compatible finite fault solution. The obtained self-consistent model accounts for trenchward increasing slip, constrains stress drop, and explains key tsunami earthquake characteristics such as long duration, high-frequency depletion, and magnitude discrepancy. The confirmation that these characteristics are all intrinsic attributes of shallow rupture opens new possibilities to improve tsunami hazard assessment | Descripción: | 11 pages, 6 figures, supplementary materials https://advances.sciencemag.org/content/suppl/2021/08/02/7.32.eabg8659.DC1.-- Data and materials availability: All the seismic data used in this work are publicly available. The three MCS lines NIC20, NIC50, and SO107/NIC80 are available at NSF’s Marine Geoscience Data System (MGDS) repository (https://www.marine-geo.org/collections/#!/collection/Seismic), whereas the OBS data are available at the PANGAEA data repository: https://doi.pangaea.de/10.1594/PANGAEA.931715 for NIC20 and NIC50 and https://doi.pangaea.de/10.1594/PANGAEA.931695 for SO107/NIC80 | Versión del editor: | https://doi.org/10.1126/sciadv.abg8659 | URI: | http://hdl.handle.net/10261/248318 | DOI: | 10.1126/sciadv.abg8659 | E-ISSN: | 2375-2548 |
Aparece en las colecciones: | (ICM) Artículos |
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Sallares_et_al_2021.pdf | 6,9 MB | Adobe PDF | Visualizar/Abrir | |
Sallares_et_al_2021_suppl.pdf | 18,76 MB | Adobe PDF | Visualizar/Abrir |
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