The following information is available for the seismic and geophysical networks
that contribute data to the NCEDC:
This document describes the data collection by network. Other
documents describe the data by type
and by access. Or see the
summary of products for an
overview of the entire holdings.
The Parkfield High Resolution Seismic Network,
a part of the Parkfield Prediction Experiment, has produced a
high resolution earthquake data set as a secondary effort in the
'Controlled Source Monitoring' (Vibroseis) project. Available
data include the Parkfield HRSN earthquake location catalog and
The BK network code may be thought of as including several different networks,
including the sparse broadband network known as the BDSN, the collection of
borehole geophones and accelerometers established for monitoring the
northern Hayward fault (NHFN), and the collaborative project in geophysical
monitoring known as the mini-Plate Boundary Observatory project (MPBO).
Available data include continuous and triggered waveforms,
catalogs of hypocenters, phase and amplitude readings, and moment
The NCSN was originally deployed as a dense short-period seismic network
in northern and central California, run by the USGS, Menlo Park. This network is also known as
CALNET. More recently, the NCSN has deployed a number of broadband stations and
strong-motion sensors. Available data include triggered waveforms, catalogs of
hypocenters, phase and amplitude readings, and first-motion mechanisms.
The University of Nevada, Reno, operates a network which includes 4
stations with broadband sensors located in western Nevada
and eastern California. A waveform archive of these
broadband data is available at the NCEDC.
A borehole microseismic network was original deployed in the Geysers Geothermal Field
by the Unocal Corporation. Now operated by the Calpine Corporation,
10 years of triggered event waveform data are available at the NCEDC.
An extensive collection of fault monitoring data from California, Oregon, Alaska
and the South Pacific is available through the UL network. The dataset consists of
9 different experiment types and contains over 1300 channels of strain, creep,
magnetic field, tilt, well water level, differential lake level, electric field,
pore pressure and associated environmental measurements such as rainfall,
barometric pressure, wind speed, snow depth and crustal
temperature at various depths.
The BARD Network is a GPS (Global Positioning System) network of continuous recording
and periodically surveyed sites in Northern California.
The Earthscope program is an
initiative of the National
Science Foundation to investigate the structure and
evolution of the North American continent and the physical
processes controlling earthquakes and volcanic eruptions.
The NCEDC is archiving several types of data from the
- PBO Strain data (Overview | Data)
The Plate boundary Observatory (PBO) 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 which will be used to
deduce the strain field on timescales of days to decades and
geologic and paleoseismic investigations to examine the strain
field over longer time scales.
- SAFOD Seismic data (Overview | Data)
The San Andreas Fault Observatory at Depth (SAFOD) is a deep borehole
observatory that will directly measure the physical conditions under
which plate boundary earthquakes occur.
The SAFOD pilot hole is a separate, 2.2-km-deep scientific drilling
experiment at the same surface location as SAFOD. This site is ~ 1.8
km SW of the San Andreas fault near Parkfield, CA, on a segment of the
fault that moves through a combination of aseismic creep and repeating
microearthquakes. It lies just north of the rupture zone of the 2004,
magnitude 6 Parkfield earthquake, the most recent in a series of events
that have ruptured the fault six times since 1857.
- USArray Seismic data (Overview | Data )
Data from 19 stations of the Berkeley Digital Seismic Network are
part of the USArray deployment in California. The NCEDC is also archiving
data from the Transportable Array stations being deployed in central and
northern California, southern Oregon, and western Nevada.