Acquire over 2000 line-km of MCS data with 210 in^3 GI-guns and sonobuoys (for long offsets) in the data gap for modern seismics on this margin; EK60/80 data
Location
Mid-Atlantic margin, 35 nm south of Hudson Canyon to approximately Cape Hatteras, 100 m to 3500 m water depth
Summary
Acquired just over 2000 line kilometers of multichannel seismic data between Hudson Canyon and Cape Hatteras, mostly using four 105/105 Sercel GI guns operated at 105 cubic inches volume and towed on 2 strings of two guns each as the source. The streamer of receivers was over 1 km long for most of the cruise, and most data were acquired between the shelf break and ~2500 m water depth. Seismic data were acquired both on dip lines and strike lines (deepwater and top of slope). Sonobuoys were deployed at 60 locations at water depths greater than 1000 m along the MCS survey lines. The EK80 with a 38 kHz transducer was operated continuously during the cruise to image water column methane bubbles. Ship's sensor and ADCP data available at: https://www.rvdata.us/search/cruise/HRS1807
Environmental compliance: Incidental Harassment Authorization (IHA) acquired for Marine Mammal Protection Act compliance; Biological Opinion issued by NMFS Office of Protected Resources for Endangered Species Act compliance. Miscellaneous consultations related to essential fish habitat, seabirds, etc. Finding of No Significant Impact issued by the USGS.
Info derived
gas hydrate distribution, geohazards
Comments
Nathan Miller co PI
Large amount of equipment being borrowed from Scripps
Project will require an IHA from NMFS (MMPA) and a biological opinion from OPR (ESA). IHA is expected on 6 August 2018
Streamer composed of both solid state and oil-filled active sections of 50 and 100 m lengths (6.25 or 12.5 m groups, respectively) configured in active sections equalling 700 -1200 meters long.
Boomer, Multichannel, Sparker, Air Gun / Water Gun, Bubble Gun
Split-beam echo sounder and navigation data collected using a Simrad EK80 wide band tranceiver and ES38-10 transducer during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA
Sonobuoy seismic and navigation data collected using Sercel GI guns and Ultra Electronics seismic sonobuoys during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA
Multichannel seismic-reflection and navigation data collected using Sercel GI guns and Geometrics GeoEel Digital Streamers during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA
