l Select and prepare your site. If the site requires the construction of a pier or other
time-consuming labour, factor this time into your installation schedule. See "Preparing
the Site for a Vault Installation" on the next page.
l Select your insulation method. You can thermally insulate your Trillium Compact
Vault seismometer with the insulating cover (recommended) or make a free-standing
cover out of rigid plastic foam. Determine which method you will use before your
installation so that you have the necessary materials on-site. For more information on
insulating your seismometer, see "Theory and Practice of Insulation" on page40 and
"Insulation Options" on page42.
l Gather your installation tools and materials. At a minimum you should have the
following on-site when installing your seismometer:
l Thermal insulation
l Power source
l Digitizer and cable. See "Cables and Accessories" on page12 for information on
cables and other accessories.
l Compass for alignment. See "Aligning and Leveling a Trillium Compact in a Vault
Installation" on page39.
l Gather any optional tools and materials you may need. Your installation may
also require:
l A laptop or mobile device with software and cables required to connect to and
communicate with the digitizer if using one without a display screen.
l Ground the system using the guidelines in "Grounding guidelines " on page89.
l Note that there are no special handing requirements for connectors for the Trillium
Compact Vault.
3.3 Selecting a Site for the Trillium Compact Vault
There is no substitute for a geological survey when it comes to site selection. A survey provides
knowledge of the structures over which the seismometer will be installed.
Where possible, seismometers should be installed on bedrock and as far away as possible
from sources of cultural noise such as roads, dwellings, and tall structures. Low porosity is
important as water seepage through the rock can cause tilts which overwhelm the seismic
signal at long periods. Clay soils and, to a lesser extent, sand are especially bad in this sense.
Chapter 3 - Installing a Trillium Compact Vault Seismometer
16889R10 • 2020-11-12 Page 31
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