Yreka Blue Horn Mine, CA, United States
IMS Station Type
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.