TRAY - Twisselman Ranch, Shandon, 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 TRAY
In Operation 2016/05/26 00:00:00 - 2024/04/30 15:50:00
Elevation: 690.0 meters
Instrumentation Borehole



Berkeley Digital Seismic Network (BK)


Pliocene or Pleistocene sandstone, shale, and gravel deposits

Borehole Conditions

This was a TremorScope borehole station. The casing was Schedule 21 PVC, and the inner diameter of the borehole was 6 inches. A hut was constructed over the borehole with solar panels on the roof providing power for the site. Site was decommissioned in 2024.

Station Pictures

The hut at TRAY

The hut at TRAY

Engineers installing equipment at TRAY.

Engineers installing equipment at TRAY.

Table of Seismic Instrumentation

SensorDataloggerSEED ChannelsLocation
BroadbandGuralp CMG-3TB Broad Band SeismometerCMG-DM24-EAMBH?,CH?,LH?40
AccelerometerGuralp CMG-5TCCMG-DM24-EAMHN?00
Guralp CMG-5TCMG-DM24-EAMHN?40

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

Waveform Data