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Summary
Since 1967 the U.S. Geological Survey has operated the Northern California
Seismic Network (NCSN) to provide earthquake data for a wide range of research
topics and hazard-reduction activities. The NCSN is designed to detect all
local earthquakes having signal strength above the background level of
microseisms. The network configuration was motivated by the need to ... monitor
active faults and volcanoes with a station density sufficient to determine the
focal depth of shallow (0-15 km) crustal earthquakes. Depending on the
concentration of stations in a region, the magnitude (M) level at which
earthquake detection is complete varies from approximately 1.4 in parts of the
central Coast Ranges to 2.6 in the Klamath Mountain range. However, earthquakes
with M<1.0 are routinely detected throughout the network.

The NCSN operates 412 stations in northern and central California and records
an additional 100 stations maintained by 4 other institutions. It records a
total of 924 channels of data using a mix of digital and analog systems. Nearly
one fourth of the stations in the network are now digital, and 11 of the
digital stations have broadband sensors, 92 have strong-motion sensors, and 11
are borehole installations. The remainder of the stations are mostly comprised
of short-period vertical-component sensors. The NCSN telemetry system utlizes
local collection nodes which are linked to Menlo Park via analog microwave,
digital satellite telemetry, and leased digital circuits. The network also
utilizes direct radio telemetry to Menlo Park and operates an extensive LAN
that links urban stations located in the San Francisco Bay region.

NCSN network geometry is illustrated in a map of northern and central
California located at the following URL:
http://quake.geo.berkeley.edu/ncsn/map.html.

Data Access:
An earthquake catalog is produced from analysis of the NCSN data. Locations,
magnitude, phases, coda durations, and first-motion mechanisms are available
using the earthquake catalog search,
http://quake.geo.berkeley.edu/ncedc/catalog-search.html.

At this point in time, NCSN waveform data are not available in SEED format.
However, effort is underway to provide this capability. For the present, NCSN
waveform data are available through the EVT_FAST waveform request form,
http://quake.geo.berkeley.edu/ncedc/evt_fast_form.html, or through research
accounts.

Related URL

Link: GET DATA Description: Northern California Earthquake Catalog Search. Link: GET DATA Description: The above URL provides information on NCSN data access, stations, channels, equipment, and collaborations.

Geographic Coverage Spatial coordinates   

N: 40.0

S: 35.0

E: -116.0

W: -124.0

Temporal Coverage

Start Date: 1967-01-01

Location Keywords

SOLID EARTH > CRUST CONTINENT > NORTH AMERICA CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA > Northern California

Data Resolution

Temporal Resolution: Varies with instrument

Science Keywords

SOLID EARTH > SEISMOLOGY > EARTHQUAKE DYNAMICS SOLID EARTH > SEISMOLOGY > EARTHQUAKE OCCURRENCES SOLID EARTH > SEISMOLOGY > SEISMIC PROFILE

ISO Topic Category

GEOSCIENTIFIC INFORMATION

Instrument

ACCELEROGRAPHS SEISMOGRAPHS

Use Constraints
When you use data from the NCEDC, please provide a proper acknowledgement of
the data source. Please visit http://quake.geo.berkeley.edu/acknowledge.html
for the appropriate data source acknowledgement.

Ancillary Keywords

CATALOG DIGITAL SEISMOGRAMS FTP IDN_NODE GSFC/NCEDC MOSAIC PHASE DATA WWW

Originating Center

NCEDC

Data Center

Northern California Earthquake Data Center, Berkeley Seismological Laboratory, University of California, Berkeley Data Center URL: http://quake.geo.berkeley.edu/ Dataset ID: NCSN-CATALOG Data Center Personnel Name: DOUGLAS S. NEUHAUSER Phone: 510-642-0931 Fax: 510-643-5811 Email: bard at seismo.berkeley.edu Email: doug at seismo.berkeley.edu Contact Address: Seismographic Station 475 McCone Hall, UC Berkeley City: Berkeley Province or State: CA Postal Code: 94720 Country: USA

Personnel

GEIR OLE BRAATHEN Role: INVESTIGATOR Phone: +47 63 89 80 00 Fax: +47 63 89 80 50 Email: geir.braathen at nilu.no Contact Address: Norweigan Institute for Air Research PO BOX 100 City: Kjeller Postal Code: N-2007 Country: NOrway GENE R. MAJOR Role: DIF AUTHOR Email: gsfc-gcmduso at mail.nasa.gov CATHRINE WAHLSTROM TELLEFSEN Role: TECHNICAL CONTACT Phone: +47 63 89 81 83 Fax: +47 63 89 80 50 Email: cathrine at nilu.no Contact Address: Norwegian Institute for Air Research PO BOX 100 Province or State: Kjeller Country: NORWAY

Creation and Review Dates

Last DIF Revision Date: 2006-12-04 Future DIF Review Date: 2005-03-16

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