August 16, 2007
In July and early August EarthScope Plate Boundary Observatory field crews installed 3 borehole strainmeter stations surrounding Mt. St Helens. Crews installed stations at station B202 (Windy Ridge), B203 (Quarry), and B204 (Marble Mountain). Each installation consists of a borehole strainmeter installed at ~800 ft deep, a 3 component seismometer located just above the strainmeter, and a tiltmeter will be installed ~ 100 ft below the surface. The final station in the cluster, B201, is nearing completion and will be installed in the early fall.
The stations are scientifically important for discriminating between different magma source model geometries and crustal rheologies.
Last modified: 2020-01-28 22:54:16 America/Denver