Installing the 3ESP
20.
Ensure that the sensor cable is loose and that it exits the seismometer
enclosure at the base of the instrument. This will prevent vibrations from
being inadvertently transmitted along the cable.
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.
14
Issue G - February 2016
