Rupture Segmentation of the 14 August 2021 Mw 7.2 Nippes, Haiti, Earthquake Using Aftershock Relocation from a Local Seismic Deployment - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Bulletin of the Seismological Society of America Année : 2023

Rupture Segmentation of the 14 August 2021 Mw 7.2 Nippes, Haiti, Earthquake Using Aftershock Relocation from a Local Seismic Deployment

Sylvert Paul
Anne Deschamps
David Ambrois
Sadrac St Fleur
  • Fonction : Auteur
Françoise Courboulex
Eric Calais
Dominique Boisson
Yvonne Font
Jérôme Chèze

Résumé

ABSTRACT The 14 August 2021 Mw 7.2 Haiti earthquake struck 11 yr after the devastating 2010 event within the Enriquillo Plantain Garden (EPG) fault zone in the Southern peninsula of Haiti. Space geodetic results show that the rupture is composed of both left-lateral strike-slip and thrust motion, similar to the 2010 rupture; but aftershock locations from a local short-period network are too diffuse to precisely delineate the segments that participated in this rupture. A few days after the mainshocks, we installed 12 broadband stations in the epicentral area. Here, we use data from those stations in combination with four local Raspberry Shakes stations that were already in place as part of a citizen seismology experiment to precisely relocate 2528 aftershocks from August to December 2021, and derive 1D P- and S-crustal velocity models for this region. We show that the aftershocks delineate three north-dipping structures with different strikes, located to the north of the EPG fault. In addition, two smaller aftershock clusters occurred on the EPG fault near the hypocenter area, indicative of triggered seismicity. Focal mechanisms are in agreement with coseismic slip inversion from Interferometric Synthetic Aperture Radar data with nodal planes that are consistent with the transpressional structures illustrated by the aftershock zones.
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hal-03814347 , version 1 (22-11-2023)

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Roby Douilly, Sylvert Paul, Tony Monfret, Anne Deschamps, David Ambrois, et al.. Rupture Segmentation of the 14 August 2021 Mw 7.2 Nippes, Haiti, Earthquake Using Aftershock Relocation from a Local Seismic Deployment. Bulletin of the Seismological Society of America, 2023, pp.58-72. ⟨10.1785/0120220128⟩. ⟨hal-03814347⟩
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