West Coast/Alaska Tsunami Warning Center Seismometer Sites

SIT Seismic Site

SIT Seismic Site

SIT

Site Conditions: S-13, GeoTech 7505A, CMG-3NSN, and Kinemetrics Episensor seismometers placed in a mostly buried vault. The vault is built into Mesozoic-aged graywacke. Seismic piers are separated from floor. The vault is located at the Sitka Geomagnetics Observatory. This is the oldest continuously occupied seismometer site in Alaska. It was built in 1904 and instrumented with a Bosch/Omori seismometer. The CMG-3NSN and Episensor were installed in 1999 to US National Seismic Network specifications.