Concept
Guralp Orcus ocean bottom seismometer
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL1925/1/ | ||
|---|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | ||
| Alternative Labels | Guralp Orcus OBS | ||
| Definition | A real-time cabled ocean bottom seismometer (OBS) that sits fully or partially buried on the seafloor at depths of up to 6000 m. The Orcus houses a 3T broadband triaxial seismometer, a Fortis force-feedback triaxial accelerometer, and an Affinity 31-bit analog-to-digital converter (ADC) data acquisition system. Depending on the deployment depth, housing is either duplex stainless steel or titanium to protect against corrosion. The unique spherical shape of the casing protects the instrument at high pressures, and an underlying metal plate ensures optimum ground coupling. An optional concrete dome hood can be employed to reduce noise and protect against trawling in shallower waters. The integrated Guralp Affinity digitiser delivers data in real-time to the cable system. The frequency range and sensitivity of the sensors can be engineered to suit the requirements of the project. If more than one response range is required, additional geophysical sensors or hydrophones can be incorporated. Non-seismic sensors, such as differential or absolute pressure gauges for tsunami early warning can also be integrated, in addition to current meters, hydrophones, compasses, and tilt-meters. The Orcus OBS has applications in cable to shore or cable to buoy systems, real-time data streaming, local, regional and teleseismic monitoring, long-term reservoir monitoring, and earthquake/tsunami early warning. The Orcus has a frequency response of 120 s (0.008 Hz) to 50 Hz, or optional 360 s (0.0028 Hz) to 50 Hz. Seismometer sensor dynamic range is 167 dB at 1Hz. | ||
| Date | 2023-05-19T17:33:57 | ||
| Identifier | SDN:L22::TOOL1925 | ||
| Note | accepted | ||
| Is Version Of | TOOL1925 | ||
| version | 1 | ||
| Broader | L05:368 |
seismometers | |
| Related | L35:MAN0141 |
Guralp Systems | |
B75:ORG01765 |
Guralp Systems Ltd | ||
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