A look at the PBO Durmid Hill (EW) Strainmeter Project

Initial site work -- May 2004

drilling for end-point optical anchors (click picts for full image).

After working through summer -- October 2004:

setting one of the two end-buildings (click pict for full image).

Completed installation -- May 2005:

end-building with vacuum tube (click pict for full image).

Optics Table :

laser strainmeter and optical-anchor optics (click pict for full image).

Initial Long Period Recordings -- February 2006

length-change, corrected using anchoring, giving earth strain (click for full image).