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Installing Infrastructure for California's Earthquake Early Warning System
Early in 2018 we became successful bidders for the initial roll out of stations as part of ShakeAlert in Northern California. Working with UC Berkeley seismological lab personnel, we have installed infrastructure for over 100 sites in Northern California, many of which are in very remote mountainous areas.
Access logistics are a large part of the construction challenge, requiring mobilization of drilling and excavating equipment , as well as on-site mixing of relatively large quantities of concrete for the well pad and Rohn spec tower foundations.
Site at mouth of Mattole River
A standard site requires the installation of two 10" cased boreholes 11' deep with a well pad, and an additional large footing with Rohn tower, solar panels and electrical cabinet. Boreholes are drilled typically with auger, or rock demolition tooling when required. Tower foundations range from 4'x4'x2' deep to approx 8'x8'x4' deep (9 yards of concrete) for a freestanding Rohn 65.
Some sites also incorporated a DDBM PBO style GNSS monument (see Plate Boundary Observatory)
Rohn 65: 9 yards of concrete
Erecting tower
Site with cattle fence
In the Redwoods
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