Seismometers

Guralp Ocean Bottom System (OBS)

The Guralp Systems' Ocean Bottom System (OBS) is a multi-sensor unit comprising:

a CMG-5T triaxial true broadband feedback strong motion (+/-2g) accelerometer
a CMG-1T triaxial true broadband (360s-50Hz) feedback seismometer
a CMG-EAM enhanced acquisition and communications module
GSL's 'Virtual Sphere' microprocessor-controlled orientation and levelling system

All components of the Ocean Bottom System (OBS) are encased in a cast titanium sphere capable of 3000m deployment. A submersible 25-pin provides inputs for an external Nortek Current Meter and a Differential Pressure Gauge. These instruments comprise the "Auxiliary Platform" of the Broadband Seismometer system.This auxiliary platform holds a back-up battery to power the seismometer in event of a power outage. Additionally, the Nortek Aquadopp current meter and a differential pressure gauge can be used to help seismologists detect and remove current, tides and wave signatures from seismic data.

Above: Guralp Ocean Bottom System (OBS) is a cast titanium sphere that encases the broadband seismometer and accelerometer instruments.

Seismometers on the Seafloor

Broadband Seismometers

Guralp CMG-IT broadband seismometers have been installed at ODP 1027, ODP 889 and Barkley Canyon. Another is slated for Ridge Flank at Endeavour in Summer 2013.

Guralp CMG-IT Broadband Seismometer at ODP 1027
Guralp CMG-IT Broadband Seismometer at ODP 889
Guralp CMG-IT Broadband Seismometer at Barkley Canyon

Short Period Seismometers

Two GEOSense BH-1 corehole short-period seismometers are deployed at Endeavour Ridge.

GEOSense BH-1 Corehole Seismometer at Endeavour North Regional Circulation Mooring site.
GEOSense BH-1 Corehole Seismometer at Main Endeavour Vent Field.

How to Get Seismometer Data from IRIS

Our seismic data feeds directly into IRIS, a consortium of over 100 US universities dedicated to the acquisition, management, and distribution of seismological data.

Step-by-step instructions for viewing NEPTUNE Canada seismic data on IRIS.

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