Haiti-TWiST temporary OBS network

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)

在法国国家研究署（Agence Nationale de Recherche, ANR）资助的CAST（加勒比主动地震构造，Caribbean Active SeismoTectonics，2023-2028）项目框架下，Geo-Ocean、Géoazur与海地国立大学（Université d'État d'Haïti）于2024年7月至2026年2月期间，在伊斯帕尼奥拉岛西部近海的加勒比海海域临时布设了一套被动监测台网，用于记录地震与震颤活动。

本实验旨在表征北加勒比地区现今断层活动类型（慢滑移与快滑移）。加勒比板块（Caribbean Plate）相对于北美板块（North American Plate）以约20毫米/年的速率运动，该滑移被分配至两条“孪生”走滑断层（strike-slip faults）：北部的塞普特里翁-奥连特断层（Septentrional-Oriente Fault）以及南部的恩里基约-芭蕉园断层（Enriquillo-Plantain Garden Fault）。法国海洋开发研究院（Ifremer）与Géoazur在向风海峡（Windward Passage）和牙买加海峡（Jamaica Passage）布设了多台宽频带海底地震仪（broadband ocean-bottom seismometers），以补充牙买加、古巴及海地已有的陆基台网。

本次布设的仪器包括Geo-Ocean库中的KUM Nammu型设备，以及从都柏林高级研究院（Dublin Institute for Advanced Studies, DIAS）租赁的额外设备。所有仪器均为搭载三分量（3-component）120秒Trillium传感器的KUM Nammu宽频带地震仪，除一台外均配备记录用水听器。所有传感器的采样率均为250赫兹。首7个月期间，两个海峡各以“X”形布局部署5台仪器；后续12个月，两个海峡各以类方形布局部署4台仪器。

CAST项目官网：https://www.geo-ocean.fr/en/What-we-do/Marine-Hazards/Projects/CAST

与该台网相关的海上科考航次：
海地-TWiST：https://campagnes.flotteoceanographique.fr/campagnes/18001258/fr/（首次部署）
海地-TWiST-Rsquared：https://campagnes.flotteoceanographique.fr/campagnes/18003804/（首次回收与重新布设）
海地-TWiST-RFin：（最终回收；官网待上线）