MOMAR

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Project title and acronym    

MOMAR_Tilt

Host  facility    

MOMAR  EMSO    Azores

Modality of    Access    

MoA2 – Partially remote (the presence of the user is required at some stage, e.g. for installing and uninstalling an instrument)

Description

The Lucky Strike hydrothermal vent field is one of the most prominent vent sites on the Mid-Atlantic Ridge. Some of the most important processes that control local geology and sediment deposition, fluid chemistry and biology are tectonics and hydrothermally driven fluid circulation, which are both well known to be related to sea-floor deformation. These deformation processes can be monitored by ocean bottom pressure and seafloor tilt measurements.

The Bremen OBT (ocean bottom tilt station) and the Bremen OBP (ocean bottom pressure station) have been developed, built by the group of the PI and successfully deployed several times over period of up to one year. The OBT uses a tilt sensor (Applied Geomechanics) which consists of two orthogonal bubble sensors with a range of ±10° and a resolution of 1 µrad. The OBP uses a high resolution Parascientific Digiquartz sensor and a PPC (Bennest, Canada) with a resolution of 0.7 Pa (0.07 mm) at 0.5 Hz sample rate. Both instruments record their data autonomously for a time period of one year. In conjunction with other long-term measurements at Lucky Strike Hydrothermal Field like seismicity, hydrothermal activity, temperature and salinity of bottom water, we will be able to contribute to a critical data set for the assessment of hydrothermal and magmatic activity.