Sensors at the sea floor are used to observe acoustic and
seismic events.
Since the OBS/OBH works with hydrophones as well as with geophones,
both names, OBS (Ocean Bottom Seismometer) and
OBH (Ocean Bottom Hydrophone)
are used for this observation and registration system. Combined with
marine Multi-Channel Seismic (MCS) profiles,
OBS is an economical alternative to ship-bounded
Common MidPoint (CMP) methods in seismics.
One aspect as an example:
for MCS/OBS one vessel including the seismic array is necessary,
while CMP requires two vessels each equiopped with seismic array.
OBS may be equipped with a maximum of a three-component geophone
in addition to a hydrophone, and thus it needs a capacity of more than
144 Mbyte, which would be the minimum for an adequate MCS profiling.
In a typical survey, the instruments should be operational for several
days, which requires a data storage capacity of more than 500 Mbyte.
Other experiments, such as tomographic investigations within a 3D-survey
or seismological monitoring, demand even larger capacities.
|
Technical specifications of OBS are given in the data sheet of the
Equipment Pool as a
WORD-formatted document -
today unformunately without figure due to restricted webspace.
OBS was developed by industrial management and organisatoric guidance
of GEOMAR Technologie. GEOMAR Technologie was organising and
combining the research and development activities of enterprises
in sea technology and of science and academia.
OBS today is part of the GEOMAR Equipment Pool and may be rent as well
as bought.
Points of interest for the user:
Finally, remarks by scientists working with the OBS/OBH
(see: Cruise Report RV SONNE 96, E. Flüh and W. Weinrebe, 1994):
English version |
Deutsche Version
timing, navigation, relocation aids
standard interfaces and formats
“
The seismic traces gained.. are then reprocessed.. .
And the data processing goes on and on resulting in new questions
to the Earth's underground.
Finally, the GEOMAR OBS will be deployed
again and again and again ... prooving its reliability
.
“
Sorry, partially only in German:
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Ocean Bottom Seismometer/Hydrophone (OBS/OBH) |
MobiWinch (Mobile Deepsea-Winch) |
Ocean Floor Observation System (OFOS) |
Heave Compensation System for Winches |
Hydro Bottom Station (HBS) |
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