HERB - Caltrans Maintenance Yard, Hercules, 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 | HERB |
| In Operation | 2001/09/18 23:44:00 - Present |
| Latitude | |
| Longitude: | |
| Elevation: | -18.0 meters |
| Instrumentation | Borehole |
Location
The station is located at the Hercules Maintenance Yard in Hercules, California, and is under the auspices of Caltrans.Network
Northern Hayward Fault Network (BK)Geology
Sandstone, shale, silstone, and breccia
Borehole Conditions
The HERB borehole was drilled by Caltrans and the sensor package cemented at the depth of 217m.Station Pictures
Caltrans drill rig at HERB |
Drilling the HERB borehole |
Table of Seismic Instrumentation
| Sensor | Datalogger | SEED Channels | Location | |
| Accelerometer | Wilcoxon 731A Accel. (0.5 g max 10 v/g) | BASALT8X | BN?,CN?,LN? | 40 |
| Geophone | Oyo GeoSpace GS-11 Vertical Geophone | BASALT8X | DP?,LP?,SP? | 40 |
| Auxiliary | CPULoadAverage | BASALT8X | LC? | 40 |
| CalibrationInput | BASALT8X | LC? | 40 | |
| ClockPhase | BASALT8X | LC? | 40 | |
| ClockQuality | BASALT8X | LC? | 40 | |
| DataStorageUsed | BASALT8X | LC? | 40 | |
| Humidity | BASALT8X | LI? | 40 | |
| InputVoltage | BASALT8X | LE? | 40 | |
| SystemCurrent | BASALT8X | LE? | 40 | |
| Temperature | BASALT8X | LK? | 40 |
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
- Instrument Response
- Querying the archives
- Download waveform data
