Guralp-systems CMG-3ESPCD Uživatelský manuál stáhnout pdf (Strana 14)

CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD

stratify the air in the seismometer package. Position the thermal

insulation carefully so that it does not touch the sensor package.

11. Ensure that the cables are loose and that they exit the seismometer

enclosure at the base of the instrument. This will prevent vibrations

from being inadvertently transmitted along the cables.

3.4 Installing in pits

For outdoor installations, high-quality results can be obtained by constructing

a seismic pit.

Depending on the time and resources available, this type of installation can

suit all kinds of deployment, from rapid temporary installations to

medium-term telemetered stations.

Ideally, the sensor should rest directly on the bedrock for maximum coupling

to surface movements. However, if bedrock cannot be reached, good results

can be obtained by placing the sensor on a granite pier on a bed of dry sand.

1. Prepare a hole of 60 – 90 cm depth to compacted subsoil, or down to

the bedrock if possible.

2. On granite or other hard bedrock, use an angle grinder to plane off the

bedrock at the pit bottom so that it is flat and level. Stand the

instrument directly on the bedrock, and go to step 7.

3. On soft bedrock or subsoil, you should install a pier as depicted below.

MAN-C3E-0002 14 Issue B - November 2013

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Guralp-systems CMG-3ESPCD Uživatelský manuál Strana 14