A rusty bunker-looking building with the door open.
Yreka Blue Horn Mine, CA, United States

41.73193, -122.710388
Elevation 1060.00 meters
Station Type: Seismic
IMS Station Type
Auxiliary Seismic

A single broadband seismometer located in an abandoned mine in Klamath National Forest. There has been a seismometer at YBH since 1993, and was incorporated into the International Monitoring System in 2002. The seismometer sits on a poured concrete pier approx. 40m (115 ft) from the mine entrance, and the site has about 75m (225 ft) of overburden above it. YBH is maintained by the University of California Berkeley Seismology Lab.