Plate Boundary Observatory Strain and Seismic Data
Data access | Collaborations
The Plate Boundary Observatory (PBO) component of EarthScope, operated by UNAVCO, is a geodetic observatory designed to study the three-dimensional strain field resulting from deformation across the active boundary zone between the Pacific and North American plates in the western United States. The observatory consists of arrays of Global Positioning System (GPS) receivers and strainmeters with collocated seismic sensors which will be used to deduce the strain field on timescales of days to decades.
The NCEDC serves as an archive for the PBO strainmeter and seismic data, which consists of borehole strainmeters and long-baseline laser strainmeters. Data from PBO has been assigned a network code of PB.
- Network Code
- Typical Recorded Channels
Borehole Strainmeters Sensor SEED Channels SEED Location Rate (samples/sec) Sampling Mode Gladwin Tensor Strainmeter BS1,BS1,BS3,BS4 T0 20 Hz Continuous Gladwin Tensor Strainmeter LS1,LS2,LS3,LS4 T0 1 Hz Continuous Pore pressure 1 Hz Continuous Barometric pressure LDO 1 Hz Continuous Downhole Thermistor 1 Hz Continuous Rainfall & surface temperature 1/300 Hz Continuous Laser Strainmeters Sensor SEED Channels SEED Location Rate (samples/sec) Sampling Mode Laser Strainmeter LS1 LM Continuous
- Seismic Sensors Typical Recorded Channels
Sensor SEED Channels SEED Location Rate (samples/sec) Sampling Mode Geophone EHZ,EH1,EH2 -- (blank) 100 Continuous Geophone LHZ,LH1,LH2 -- (blank) 1 Continuous Broadband HHZ,HHN,HHE -- (blank) 200 Continuous
- Station Information
- PB Information Directory, including
- Data access
- SEED data requests
Waveform data from the PB 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.
- Querying the archives
- Access data through NCEDC web services
- Requesting data by channel and time
- Requesting data by event
Help on using these tools is available.
- DART (Real-Time Data)
DART (Data Available in Real Time)
is a buffer of real-time telemetry MiniSEED data
that is accessible directly from the web or through data retrieval tools which will
be available in near future.
- Processed strain data
All PBO borehole strain data , laser strain data, and their associated environmental data are available in a "processed XML" format at 300 second (5 minute) sample interval. All data for one station year are contained in a single XML file. The XML file names contain the SEED station name, the year of the data, and the date and time that this data was created. PBO will be updating and adding data to these files on a regular basis. The NCEDC will maintain older copies of the data files, so that in general, you want only the most recent station year file for each station.
These XML borehole and laser strain data files are available at the the following locations, and are organized by year and PBO stationname.
PBO Site Type Link to Processed XML Data Borehole Strain Data /pbo/strain/processed/bsm/ Laser Strain Data /pbo/strain/processed/lsm/
The XML data files are compressed with the "bzip2" program, an open-source file compression program which is freely available in both source and executable format at: http://www.bzip.org/.
- Raw strain data
All PBO laser strain and environmental data are also
available in the original "Ice9" format. These
raw format files are
organized by year and station. The file names indicate the year,
day of year, the station name and the sampling rate (1s - 1 sample per
second or 5 min - 1 sample every 5 minutes).
All PBO borehole strain and environmental data are also available in the original "Bottle" format. These raw format files are organized by year and station. The raw borehole and laser strain data files are available at the the following locations, and are organized by year and PBO stationname.
PBO Site Type Link to Raw Data Borehole Strain Data /pbo/strain/raw/bsm/ Laser Strain Data /pbo/strain/raw/lsm/
For more information on the PBO Strainmeter data, please see the PBO Strainmeter Data Site.
- PBO strain data are also available through the IRIS Data Management Center.