Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Sentinel optical and SAR data highlights multi-segment faulting during the 2018 Palu-Sulawesi earthquake (Mw 7.5)

Abstract : The main active tectonic structure in the western part of Central Sulawesi (Indonesia) is the left-lateral Palu-Koro strike-slip fault. Its offshore section was thought not to have broken during the M w 7.5 Palu Earthquake on 28 September 2018, challenging the established knowledge of the tectonic setting at this location. Here, we use Sentinel-1 SAR interferometry to produce a map of the ground velocities in the area of the M w 7.5 earthquake for the seven months following the 2018 earthquake. We show evidence of surface deformation along the western coast of the Palu bay, indicating that the Palu Koro offshore fault section might have contribute to or been affected by the earthquake. As the possibility of multi-segment ruptures is a high concern in the area because of the high seismic and tsunami hazard, we present here, a fault model that includes the offshore section of the Palu-Koro fault. Thanks to four independents space-based geodetics measurements of the co-seismic displacement (Sentinel-1 and Sentinel-2 correlograms) we constrain the 3D co-seismic ground displacements. The modeling of these displacements allows us to estimate the co-seismic fault slip amplitude and geometry at depth. At the end, we consider the multi-segment faulting scenario, including the offshore section of the Palu-Koro fault, as a plausible model to explain the submarine landslides and the tsunamis. This study also gives the opportunity to observe a super-shear earthquake in the context of a complex fault network and implies an increase in the probability of submarine landslides within the bay in the forthcoming years.
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [36 références]  Voir  Masquer  Télécharger

https://hal-brgm.archives-ouvertes.fr/hal-02913694
Contributeur : Myriam Chergui <>
Soumis le : mardi 11 août 2020 - 07:55:41
Dernière modification le : mercredi 14 octobre 2020 - 04:15:30

Fichier

s41598-020-66032-7.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Licence


Distributed under a Creative Commons Paternité - Pas de modifications 4.0 International License

Identifiants

Collections

Citation

Guillaume Bacques, Marcello de Michele, Michael Foumelis, Daniel Raucoules, Anne Lemoine, et al.. Sentinel optical and SAR data highlights multi-segment faulting during the 2018 Palu-Sulawesi earthquake (Mw 7.5). Scientific Reports, Nature Publishing Group, 2020, 10 (1), ⟨10.1038/s41598-020-66032-7⟩. ⟨hal-02913694⟩

Partager

Métriques

Consultations de la notice

109

Téléchargements de fichiers

104