Seismometers
Seismograph Network
Seismometers are located at all but the Folger Passage Node (which is too noisy) comprising the seismograph network. Data from the seismometers are directed to the Incorperated Research Institutions for Seismology and the Geological Survey of Canada's National Seismograph Network where they are used, together with data from land-based instruments, to locate global seismicity and regional events around the Juan de Fuca plate. The data also allow for detailed studies to be conducted in locations where the instruments are installed. At Endeavour, the instruments provide the basis for interdisciplinary collaboration in the analyses of earthquake-related events at a mid-ocean ridge. (NEPTUNE Canada: An Invitation to Science, 2012).
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.
Related Seismometer Blog Posts
Barkley Canyon seismometer installation
ODP 1027 seismometer installation
ODP 889 seismometer installation
MEF Installation
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.