Electromagnetic Field Measurements

UC Berkeley seal USGS Logo

In collaboration with Professor Frank Morrison of the Department of Civil and Environment Engineering, the Berkeley Seismological Laboratory has established electromagnetic field observatories at 2 BDSN sites.

Sites were initially established at SAO and PKD1. When the BDSN site at PKD1 was relocated to PKD, additional electromagnetic sensors were installed there. The PKD1 equipment was recorded in parallel with PKD for several months and then removed in early 1999.

In addition, the BSL collaborates with Professor Steve Park of UC Riverside to collect and archive data from a low-frequency, long-baseline electric field project at site PKD2. This experiment (which is separate from the observatory at site PKD1), uses an 8 channel Quanterra datalogger to record the data.

Network Code

Current Station Equipment
3-component magnetic field sensors (0.0001 - 20 Hz)
Multiple component electric field sensors (DC - 20 Hz)
24-bit Quanterra digital data logger
GPS clock
Continuous telemetry to UC Berkeley
Dialup telephone access
72 hour backup power supply

Recorded Channels
Sensor SEED Channels Rate (samples/sec) Sampling Mode FIR Filter
Magnetic VT? 0.1 Continuous Acausal
Magnetic LT? 1.0 Continuous Acausal
Magnetic BT? 40.0 Continuous Acausal
Electric VQ? 0.1 Continuous Acausal
Electric LQ? 1.0 Continuous Acausal
Electric BQ? 40.0 Continuous Acausal

Network State of Health
The BSL has been working with Dr. Gary Egbert at Oregon State University to install his software for automated data processing and quality control.

Characteristics of integrated spectra and parameters of the first Earth-ionosphere cavity resonance are calculated routinely.

Station and Channel Information

Data access
Waveform data from the BK network are available in SEED format. Several tools provide access to SEED format data at the NCEDC, both in terms of querying the archives and allowing data requests.

Help on using these tools is available.

The results of daily magnetic activity and Schumann resonance are available via anonymous ftp at the NCEDC. The README file provides some additional information.

Reports and Publications

The electromagnetic observatories were initiated as a cooperative project with UC Riverside and Stanford University with funding from the USGS NEHRP.