GURALP CMG-3TB - Sismic
GURALP CMG-3TB - Sismic
GURALP CMG-3TB - Sismic
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Specification<br />
<strong>GURALP</strong> <strong>CMG</strong>-<strong>3TB</strong><br />
BOREHOLE SEISMOMETER<br />
The Guralp <strong>CMG</strong>-<strong>3TB</strong> borehole seismometer uses the <strong>CMG</strong>-3T transducers stacked<br />
vertically in a waterproof stainless steel sonde. The sonde can be installed in 3.5-<br />
inch minimum diameter up to 7 inch steel-cased holes (For diameters outside this<br />
range please consult the factory). The velocity output is flat from 0.0008 (120 sec) to<br />
50 Hz, (other responses availble) and the response can be set between 2*750 V/m/s<br />
and 2*10,000 V/m/s. Refer to the separate <strong>CMG</strong>-3T specification sheet.<br />
<strong>CMG</strong>-<strong>3TB</strong> systems have been tested by the US Geological Survey at its<br />
Albuquerque Seismologcal Laboratory as part of the incoming inspection for the<br />
IRIS-GSN instrumentation program. Self-noise plots from some of these tests are<br />
available. The ASL installations are in sand without the optional lock.<br />
The sonde includes the following components, from top to bottom.<br />
Lifting bail with eye hole<br />
Top cap with 1500 psi stainless connector set<br />
<strong>CMG</strong>-<strong>3TB</strong> Vertical broadband sensor<br />
" Optional hole lock with motor, (either single Jaw or three jaw versions<br />
available)<br />
" <strong>CMG</strong>-<strong>3TB</strong> North and East broadband sensors<br />
Borehole Accessories and Installation<br />
Strain Relief Fixture. Isolates the<br />
sensors from the signal and strain<br />
cable weight and motion.<br />
Downhole Digitizer. The <strong>CMG</strong>-<br />
DM24 Digitiser Module can be<br />
mounted on the strain relief fixture.<br />
Waterproof Cables. Analog and<br />
digital cables are available. Fiberoptic<br />
cables can be used in deep holes.<br />
Azimuth Orientation Table. This<br />
table supports the two horizontal<br />
transducers and can be rotated<br />
digitally from the surface.<br />
Installation in Sand. The sensor can be<br />
stabilized at the bottom of the hole with<br />
sand (up to the top of the sonde) to<br />
minimize convection around the system.<br />
Distributor: Digital Technology Associates, Inc.<br />
1330-A Galaxy Way, Concord, CA 94520 USA<br />
Tel: (925) 682-2508 Fax: (925) 682-2072<br />
dta_pauly@compuserve.com<br />
Manufacturer: Guralp Systems Limited, 3 Midas House<br />
Calleva Park, Aldermaston, RG7 8EA, United Kingdom<br />
Tel: 44-118-9819056 Fax: 44-118-9819943<br />
sales@guralp.com<br />
www.guralp.com<br />
12 June 01<br />
Page 1/2<br />
<strong>CMG</strong>-<strong>3TB</strong>
Holelock Options<br />
Single-arm Lock and<br />
Controller<br />
A remotely controlled lock can<br />
be fitted below the vertical<br />
transducer. Skids position the<br />
lock against the casing.<br />
Three Jaw Lock and<br />
Controller<br />
A remotely controlled<br />
lock can be fitted below<br />
the vertical transducer.<br />
Skids position the lock<br />
against the casing.<br />
Single Jaw Hole Lock<br />
Minimum Diameter 131mm (5.16 Inches)<br />
Maximum Diameter 178mm (7 Inches)<br />
Three Jaw Hole Lock<br />
Minimum Diameter<br />
Maximum Diameter<br />
89mm (3.5 Inches)<br />
178mm (7 Inches)<br />
Sonde Length (inclues lifting eye) 1422mm (55.98 Inches)<br />
Sonde Length (inclues lifting eye) 1354mm (53.3 Inches)<br />
Distributor: Digital Technology Associates, Inc.<br />
1330-A Galaxy Way, Concord, CA 94520 USA<br />
Tel: (925) 682-2508 Fax: (925) 682-2072<br />
dta_pauly@compuserve.com<br />
Manufacturer: Guralp Systems Limited, 3 Midas House<br />
Calleva Park, Aldermaston, RG7 8EA, United Kingdom<br />
Tel: 44-118-9819056 Fax: 44-118-9819943<br />
sales@guralp.com<br />
www.guralp.com<br />
12 June 01<br />
Page 2/2<br />
<strong>CMG</strong>-<strong>3TB</strong>
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