HR: 1340h
AN: OS43B-0543    [Abstracts]
TI: UK Ocean Bottom Instrumentation Consortium: a New Pool of Seafloor Geophysical Equipment
AU: Minshull, T A
EM: tmin@soc,soton.ac.uk
AF: Southampton Oceanography Centre, University of Southampton European Way, Southampton, SO14 3ZH United Kingdom
AU: Peirce, C
EM: christine.peirce@durham.ac.uk
AF: Department of Earth Sciences, University of Durham, Durham, DH1 3LE United Kingdom
AU: McIntosh, J S
EM: jsmc@soc.soton.ac.uk
AF: Southampton Oceanography Centre, University of Southampton European Way, Southampton, SO14 3ZH United Kingdom
AU: Burchell, A C
EM: a.c.burchell@durham.ac.uk
AF: Department of Earth Sciences, University of Durham, Durham, DH1 3LE United Kingdom
AU: Sinha, M C
EM: sinha@esc.cam.ac.uk
AF: Southampton Oceanography Centre, University of Southampton European Way, Southampton, SO14 3ZH United Kingdom
AU: * Collier, J S
EM: jenny.collier@imperial.ac.uk
AF: Department of Earth Science and Engineering, Imperial College, University of London RSM Building, Prince Consort Road, London, SW7 2BP United Kingdom
AU: Warner, M R
EM: m.warner@imperial.ac.uk
AF: Department of Earth Science and Engineering, Imperial College, University of London RSM Building, Prince Consort Road, London, SW7 2BP United Kingdom
AU: Henstock, T J
EM: then@soc.soton.ac.uk
AF: Southampton Oceanography Centre, University of Southampton European Way, Southampton, SO14 3ZH United Kingdom
AB: The UK Ocean Bottom Instrumentation Consortium (OBIC) comprises the University of Southampton, Durham University, and Imperial College (London). The consortium was set up to acquire and operate a fleet of ocean bottom geophysical instruments for both consortium members and the wider community. Potential external users of our instruments are invited to contact us at info@obs.ac.uk. Our current instrument pool consists of 28 instruments: 18 LC2000 two-component ocean bottom seismometers built by the Scripps Institution of Oceanography and 10 instruments built using existing housings and LC2000 electronics. The former are two-component instruments (hydrophone and 2 Hz vertical geophone) and the latter four-component instruments (hydrophone and three-axis 4.5 Hz geophone). The four-component instruments are also equipped with differential pressure gauges for broadband seismic recording. We have modified the two-component instruments to act as seafloor electric field detectors by adding electric field amplifiers and an additional chassis section accommodating AuCl electrodes mounted in two orthogonal 12-m dipoles. The seismic instruments have been tested successfully at sea in the Solent and in $\sim 1700$-m water depth offshore Ireland, and a prototype electric field instrument was tested in $\sim150$-m water depth in Lough Fyne, Scotland. Future plans include the development of an instrument capable of simultaneous seismic and electric field recording, and extending the bandwidth of seismic recording by the addition of broad-band seismometers and high-frequency data loggers to a subset of the instruments.
UR: http://www.obs.ac.uk
DE: 7294 Instruments and techniques
DE: 3025 Marine seismics (0935)
DE: 3094 Instruments and techniques
DE: 0694 Instrumentation and techniques
DE: 0994 Instruments and techniques
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting