ARC - Humboldt State University, Arcata, CA, USA

We operate broadband and borehole stations under the network code BK. The Berkeley Digital Seismic Network (BDSN) is a regional network of very broadband and strong motion seismic stations designed to monitor regional seismic activity as well as provide high quality data. The Berkeley borehole stations have borehole geophones or other seismic sensors and may have other geophysical instrumentation.

Station Name ARC
In Operation 1992/05/28 19:48:00 - 2001/08/02 00:36:00
Elevation: 30.1 meters
Instrumentation Broadband


ARC was located on the campus of Humboldt State University, in cooperation with the Geology Department. The site was established in 1948 with the installation of Sprengnether sensors. Wood-Anderson seismographs were installed in 1952 and operated until 1993. The digital broadband equipment was installed in 1992.

The site was relocated in 2001 to station JCC.


Berkeley Digital Seismic Network (BK)


Quaternary Sandstone

Borehole Conditions

The instruments are sited on the ground floor of Founders Hall at Humboldt State University. The digital instrumentation is located on the same concrete pier as the Wood-Anderson seismometers, in a room at the northwest corner, which is isolated from the hallway via two doors. The seismometers are thermally insulated with 4" of polyurethane foam. An adjoining room contains the datalogger and supporting equipment.

Station Pictures

Founders Hall, HSU

Founders Hall, HSU

Typical STS-2 installation

Typical STS-2 installation

Table of Seismic Instrumentation

SensorDataloggerSEED ChannelsLocation
BroadbandStreckeisen STS-2 VBB Tri-Axial SeismometerQ935BH?,HH?,LH?,UH?,VH?
AccelerometerKinemetrics FBA-23 Accel. (2 g max 1.25 v/g)Q935BL?,HL?,LL?
AuxiliaryBattery VoltageQ935LE?,UE?
Internal TemperatureQ935UK?

Waveforms and associated metadata are available at the Northern California Earthquake Data Center (NCEDC).

Waveform Data