Remove the three leveling feet from the seismometer before placing it in the leveling
cradle. Retain the feet for future installations.
D.2 Using the Leveling Cradle and Spike Kit
The shallow side of the cradle (see
) provides threaded holes for connecting the
spikes included with the optional leveling cradle spike kit (Nanometrics part number 16874).
The combined leveling cradle and spike kit allows you to achieve a secure, stable, and level
installation on unprepared surfaces such as sediment, soil, sand, or gravel.
The leveling cradle spike kit includes three types of spikes, each of which is meant for a
different type of installation surface:
l
Thick spikes: Three spikes for use in sand; dry, loose soil; or snow.
l
Thin spikes: Three spikes for use in dense, wet soil or clay.
l
Long spike: One spike for use in rocky or frozen soil or ice. If more support is required,
you can use the three thin spikes with the long spike.
shows four views of a Trillium Compact mounted on a leveling cradle with the
various spike configurations.
Appendix D - Leveling Cradle and Spike Kit
16889R10 • 2020-11-12
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