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Plate Boundary Observatory Strain and Seismic Data

Network | Equipment | Channels | Information
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
PB

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

Link to PBO SEED conventions

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

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.

Help on using these tools is available.

DART (Real-Time Data)
The NCEDC 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/

What is the format for a PBO Ice-9 file?

What is the format for a PBO bottle file?

For more information on the PBO Strainmeter data, please see the PBO Strainmeter Data Site.

Collaborations
PBO strain data are also available through the IRIS Data Management Center.

PBO is one component of the EarthScope Major Research Initiative funded by the National Science Foundation (NSF).