Map
of California & Nevada earthquakes
Overview of the Berkeley Digital Seismic Network
Station Information | Data access | Reports | Collaborations
The Berkeley Digital Seismic Network (BDSN) is one of several networks of seismic instrumentation in northern and central California operated by the Berkeley Seismological Laboratory. The BDSN is an array of high dynamic range, broadband seismometers with collocated strong-motion accelerometers. Data from these stations are transmitted to UC Berkeley using continuous telemetry and are analyzed for earthquakes. 20 sites are currently operational and additional stations are planned. Two other BDSN sites consist of strong-motion accelerometers.
Notes: as of 6/15/2004, the BSL began migrating the BH channels of the BDSN from a sampling rate of 20 samples per second to 40 samples per second. The migration was complete as of 06/16/2004. The NCEDC News report contains more complete information.
As of 5:00 PM 6/30/2003, the BSL has modififed the FIR filters on the BDSN Q4120 dataloggers. The NCEDC News report contains more complete information.
- Network Code
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BK (also includes the
NHFN,
MPBO, and
MOBB)
- Typical Station Equipment
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3-component broadband seismometer
(Streckeisen STS-1, Streckeisen STS-2, Guralp CMG-40T, or Guralp CMG-3T)
3-component accelerometer (Kinemetrics FBA-23 or EpiSensor)
Pressure sensor
Temperature sensor
24-bit Quanterra digital data logger
GPS clock
Continuous telemetry to UC Berkeley
Dialup telephone access
72 hour backup power supplySome sites also have additional sensors to measure borehole strain, electric and magnetic field variations, and crustal deformation.
- Typical Recorded Channels
-
Sensor SEED Channels Rate (samples/sec) Sampling Mode FIR Filter Broadband seismometer UHZ, UHN, UHE 0.01 Continuous Acausal Broadband seismometer VHZ, VHN, VHE 0.1 Continuous Acausal Broadband seismometer LHZ, LHN, LHE 1.0 Continuous Acausal Broadband seismometer BHZ, BHN, BHE 40.0 (20.0 prior to 06/15/2004) Continuous Acausal Broadband seismometer HHZ, HHN, HHE 80.0 or 100.0 Triggered Acausal for 80 sps; Casual for 100 sps since 7/1/2003 Accelerometer HLZ, HLN, HLE 80.0 or 100.0 Continuous Acausal for 80 sps; Casual for 100 sps since 7/1/2003 Temperature LKS 1.0 Continuous Acausal Pressure LDS 1.0 Continuous Acausal - Network State of Health
-
Information about the state-of-health of the BDSN is generated
daily. The most recent SOH entry
indicates the mean data value, the standard error of the mean, and
the number of samples in the record. Channels for which the mean
is more than 1% of full-scale are indicated with a "*". Analysis of
the background noise at BDSN sites are conducted weekly. The
most recent plot compares the
station by channel in the 32-128 second period range. Annual plots
are available:
2002-2003 | 2001-2002 | 2000-2001 | 1999-2000 In addition, plots of the background noise level at each station are now available.
1998-1999 | 1997-1998 | 1995-1996
1994-1995 - Station and Channel Information
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- Map of BDSN stations
- Table of BDSN stations
- BK Information Directory, including
- List of station locations
- List of available channels
- Instrument Response
- Information on Quanterra Timing Errors
- Information on Quanterra 4120 FIR Filter changes - 6/30/2003
- Information on BH sampling rate change - 06/15/2004
- View digital seismograms
- Data access
-
Waveform data from the BK network are available in
SEED format at the
Northern California Earthquake
Data Center.
Several tools provide access to SEED format data at the
NCEDC, both in terms of querying the archives and
allowing data requests.
- Querying the archives
- Requesting data
Help on using these tools is available.
The IRIS DMC also archives data for the BDSN station CMB.
- Reports and Publications
-
- Reports on the BDSN from the Annual Report of the BSL:
- Guidelines on the installation of broadband instrumentation
- Collaborations
-
Several stations of the BDSN are operated cooperatively
by the
Berkeley Seismological Laboratory in collaboration with:
- BRIB - Lawrence Livermore National Laboratory
- CMB - IRIS Consortium and United States National Seismic Network of the USGS.
- JRSC - Stanford University - Geophysics Department.
- KCC - UC Santa Cruz.
- HUMO - United States National Seismic Network of the USGS.
- MOD - United States National Seismic Network of the USGS.
- SAO - United States National Seismic Network of the USGS.
- WDC - United States National Seismic Network of the USGS.
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Berkeley Seismological Lab
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Copyright 1995-2005, The Regents of the University of California.
Last modified: Wed Sep 17 09:20:44 PDT 2008