CMG-40T-1 - Güralp Systems Ltd
CMG-40T-1 - Güralp Systems Ltd
CMG-40T-1 - Güralp Systems Ltd
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<strong>CMG</strong>-<strong>40T</strong>-1<br />
Again, this method produces inferior bonding to the instrument, and moisture<br />
becomes trapped between the hard surfaces. We recommend the use of fine dry<br />
sand (right) contained in a box if necessary, which can also insulate the<br />
instrument against convection currents and temperature changes. Sand has the<br />
further advantage of being very easy to install, requiring no preparation.<br />
Finally, many pit installations have a large space around the seismometer,<br />
covered with a wooden roof. Large air-filled cavities are susceptible to currents<br />
which produce lower-frequency vibrations, and sharp edges and corners can<br />
give rise to turbulence. We recommend that a wooden box is placed around the<br />
sensor to protect it from these currents. Once in the box, the emplacement may<br />
be backfilled with fresh turf to insulate it from vibrations at the surface, or<br />
simply roofed as before.<br />
By following these guidelines, you will ensure that your seismic installation is<br />
ready to produce the highest quality data.<br />
20 Issue A