6V (2024-2026): Haiti-TWiST temporary OBS network

• French Research Institute for the Exploration of the Sea (IFREMER), France

In the framework of the Agence Nationale de Recherche project CAST (Caribbean Active SeismoTectonics, 2023-2028), Geo-Ocean, Géoazur, and the Université d'État d'Haïti temporarily deployed a passive monitoring network in the Caribbean Sea offshore Western Hispaniola to record earthquake and tremor activity between July 2024 and February 2026.

The goal of this experiment is to characterize the present-day fault motion (slow vs. fast) in the North Caribbean. The Caribbean Plate moves ~20 mm/yr relative to the North American Plate, and this slip is partitioned between 'twin' strike-slip faults: the Septentrional-Oriente Fault to the north and the Enriquillo-Plantain Garden Fault in the South. Ifremer and Géoazur deployed several broadband ocean-bottom seismometers in the Windward Passage and Jamaica Passage to complement the existing land networks of Jamaica, Cuba, and Haiti.
The network consists of KUM Nammu instruments from the Geo-Ocean park and additional instruments were rented from the Dublin Institute for Advanced Studies (DIAS). All deployed instruments were KUM Nammu broadbands with 3-component 120s Trillium sensors and all but one also had recording hydrophones. All sensors recorded at a sampling rate of 250 Hz. For the first 7 months, 5 instruments were deployed in an "X" like pattern in each of the passages. For the last 12 months, 4 instruments were deployed in a square like pattern in each of the passages.

CAST project website: https://www.geo-ocean.fr/en/What-we-do/Marine-Hazards/Projects/CAST

Sea campaigns related to this network
Haiti-TWiST: https://campagnes.flotteoceanographique.fr/campagnes/18001258/fr/ (first deployment)
Haiti-TWiST-Rsquared: https://campagnes.flotteoceanographique.fr/campagnes/18003804/ (first recovery; redeployment)
Haiti-TWiST-RFin: (final recovery; website to come)

FDSN Web Services provide a common data access API for seismic data.

Availability based on irisws-fedcatalog service.
Full fedcatalog information for this network