Updated Web pages for the NCEDC

August 14th, 2002

October 14, 2002

The NCEDC revamped its Web pages this month, with the goal of making the data center easier to use! In addition to updating the look of the Web pages, we have provided new and addition information about the holdings of the data center and added the capability to search the Web pages.

As part of this effort, some pages were renamed and others were removed. If you are having problems finding something, please let us know! And feel free to make any comments on the layout or organization of these Web pages.
The NCEDC is a joint project of the University of California, Berkeley and the USGS. Please send us email at ncedcinfo@ncedc.org or fill out our comments form.

Real-time earthquake information during USGS Internet cut-off

December 6th, 2001

Update on Dec. 9, 2001: The USGS Web sites are back!

On Thursday, Dec. 6, 2001, the USGS was ordered to disconnect all external Internet connections by the Office of the Secretary of the Interior. The order includes email as well as popular Web pages.

Because earthquake reporting is a collaborative effort by the CISN members, earthquake information for California continues to be available to emergency responders and the public.

Real-time earthquake information is available at these alternate Web sites:

The "Did you feel it?" Web pages are unavailable at this time.

Access to the Northern and Southern California Earthquake Data Centers and the Engineering Strong-Motion Data Center is unaffected.

EVT_FAST system provides access to NCSN waveform data

November 16th, 2001

November 16, 2001

The USGS Northern California Seismic Network (NCSN) has recorded seismic waveforms for events in northern California from 1984 through present time. These data are archived at the NCEDC, and are now available to users via the EVT_FAST automated event waveform retrieval system through web and email requests. The EVT_FAST system allows users to request all of the waveforms for a specified NCSN event with a simple one-line request. Users can request event waveform data in one of the following formats:

  • SAC binary
  • SAC ascii
  • AH (XDR)

The NCEDC is committed to distributing all waveform data and corresponding instrument response data in the standard SEED format, and is actively working with the USGS to assemble the required instrument response data for the NCSN waveforms. Until the instrument response meta-data is available, the EVT_FAST system provides a quick and easy way for users to acquire NCSN waveform data.

The EVT_FAST web interface for requesting NCSN event waveform data can be found at: /ncedc/evt_fast_form.html

Documentation on the EVT_FAST request format and email submission can be found at: http://www.ncedc.org/ftp/pub/doc/cat5/EVT_FAST.5

The NCEDC is a joint project of the University of California, Berkeley and the USGS. For more information on this data set, please contact ncedcinfo@ncedc.org.

SeismiQuery web interface available

November 15th, 2001

November 15, 2001

The SeismiQuery program, a web-based program developed by the IRIS DMC, is now available the NCEDC. SeismiQuery provides users with a variety of pre-formatted queries concerning waveform data, instrument response, and channel information database from the NCEDC using easy point-and-click or forms-based requests.

Although the name SeismiQuery may imply seismic data, the program provides information about all waveform and related channel information and responses for any data in the NCEDC database. This include broadband and strong motion waveform data from:

  • The UC Berkeley BDSN/NHFN/MPBO (network code BK)
  • The extensive geophysical waveform data from the USGS Low Frequency Geophysical Network (network code UL)
  • (in the near future) the USGS NCSN network (network code NC).

The SeismiQuery program can be found at: /SeismiQuery/

The NCEDC is a joint project of the University of California, Berkeley and the USGS. For more information on this data set, please contact ncedcinfo@ncedc.org.

USGS Low Frequency Geophysical Data available

October 19th, 2001

October 19, 2001

The Northern California Earthquake Data Center (NCEDC) and the U.S. Geological Survey (USGS) are pleased to announce the availablity of extensive "low frequency" geophysical and fault monitoring data.

With National Earthquake Hazards Program (NEHRP) funding, the USGS has supported various fault monitoring efforts. In addition to monitoring at seismic frequency bands, the USGS also has supported strain, creep, water level and other instrumental systems operating at "low frequency". Principal investigators include both USGS and academic scientists. The typical observation interval for these data sets is 10 minutes (0.00167 hz).

Raw data from most of these instruments are now available at the NCEDC, and are archived with the FDSN assigned network code "UL". The "SeismiQuery" web interface, initially developed by IRIS, can be used at the NCEDC to query the inventory and responses for this data. The raw low frequency data can be accessed with seismic querying tools such as NETDC and BREQ_FAST, and NCEDC web forms, and are are retrieved in SEED format, a standard format adopted for seismic data. The NCEDC raw data archive for this network consists of data from 1974 to the present, contains over 800 channels of data, and includes over 354 active data channels that are updated on a daily basis.

In a companion effort, the USGS is providing access to preliminary cleaned versions of these data that have been automatically scaled and modified to remove offsets and telemetry glitches. No checking of these data or the parameters used to generate them is currently being done. Careful review of the data should be done before any scientific conclusions can be drawn. The data do however provide a starting point for general viewing of fault behavior. The cleaned time series are available as plots (most recent week, most recent month, most recent year, and complete time series) and as downloadable files in either a tabular format or as an eXtensible Markup Language (XML) file.

The raw data can be found at: http://www.ncedc.org/ul/

The cleaned data can be found at: http://earthquake.usgs.gov/monitoring/deformation/data/download/

The NCEDC is a joint project of the University of California, Berkeley and the USGS. For more information on this data set, please contact ncedcinfo@ncedc.org.


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