ARC - Humboldt State University, Arcata, CA, USA

Location

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.

Network

Berkeley Digital Seismic Network (BK)

Geology

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

Typical STS-2 installation

Table of Seismic Instrumentation

	Sensor	Datalogger	SEED Channels	Location
Broadband	Streckeisen STS-2 VBB Tri-Axial Seismometer	Q935	BH?,HH?,LH?,UH?,VH?
Accelerometer	Kinemetrics FBA-23 Accel. (2 g max 1.25 v/g)	Q935	BL?,HL?,LL?
Auxiliary	Battery Voltage	Q935	LE?,UE?
	Internal Temperature	Q935	UK?

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

Waveform Data

• BK Information Directory, including
  • List of station locations
  • List of available channels
    • Year/month/day format
    • Year,doy format
  • Instrument Response
    • SEED format
    • Simplified Responses

• Querying the archives
  • SeismiQuery at the NCEDC
• Download waveform data

Noise Analysis

View more noise plots