Seismometers

Guralp Broadband Seismometer 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._

Short Period Seismometers

Bottom Pressure Recorders installed with Short Period Seismometers

In September 2011, a BPR instrument was installed at Endeavour RC North with a Short Period Seismometer (SPS). The logging units of the BPR share the can and the battery with the SPS electronics. The Paroscientific Pressure Gauge sits in its own pressure housing and has a connector to the SPS can. This combined BPR/SPS system will also be installed at Endeavour Mothra in Summer 2013.

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.

Seismometers on the Seafloor

Broadband Seismometers(OBS)

Broadband seismometers and accelerometers have been installed in the NEPTUNE Regional Network at ODP 1027, ODP 889 and Barkley Canyon. Another broadband seismometer and accelerometer are planned for the Endeavour Ridge Flank in Summer 2013.

ODP 1027

Guralp CMG-IT Broadband Seismometer at ODP 1027

ODP 889

Guralp CMG-IT Broadband Seismometer at ODP 889

Barkley Canyon

Barkley Canyon Upper Slope

Guralp CMG-IT Broadband Seismometer at Barkley Canyon Upper Slope

Short Period Seismometers(SPS)

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

Endeavour

Endeavour RC North

GEOSense BH-1 Corehole Seismometer at Endeavour RC North North Regional Circulation Mooring site.

Main Endeavour Field

GEOSense BH-1 Corehole Seismometer at Main Endeavour Vent Field.

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