NCSN data available in SEED format

November 11th, 2004

November 11, 2004

The NCEDC is very pleased to announce the availability of NCSN event waveform data in SEED format.

As a result, NCSN waveform data recorded since 3/1984* and associated metadata are now available through NCEDC tools such as:

In the near future, the NCSN event data will also be also be available with its SEED channel names through:

During 2003-2004, the NCEDC and NCSN finalized the CUSP-to-SEED channel mapping for the NCSN waveform. All of the hardware tracking and response information has been entered into the NCEDC database for the sites operated by the NCSN. Complete SEED responses for all of those data channels are now available from the NCEDC.

Additional work is required to collect, assemble, and verify the the instrument responses for data channels recorded by the NCSN at shared stations from contributing networks such as CA DWR, UNR, and SCSN. Until we have the correct instrument responses from the contributing networks, the NCEDC will provide a minimal SEED response that identifies these channels only as digital counts with unity gain so that timeseries data for these channels can be distributed in SEED format.

Completion of the NCSN SEED data coversion project has been a long, hard process. This project would not been completed without significant effort from USGS personnel Fred Klein, Gray Jenson, Bob Somera, Will Kohler, and David Oppenheimer and BSL/NCEDC personnel Doug Neuhauser and Stephane Zuzlewski. We are very grateful for their contributions to this project.

*Note:
The NCSN waveform archive consists primarily of earthquakes recorded and processed by the USGS CUSP system for the period 1984-2004. Earthquakes detected by systems other than the CUSP system result in phase and catalog entries at the NCEDC, but without waveforms. Waveforms should be available at the NCEDC for earthquakes with following range of NCSN event ID#'s:

         1  -30,999,999 
60,000,000 - 69,999,999

In addition to these event triggers, continuous data from the broadband stations operated by the NCSN are also available. The NCSN continues to perform Q/C on historic waveform data. If you find an event in the above range without waveforms, please send email at the address below.

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 if you have questions or comments about these changes.

Availability of Parkfield data

September 28th, 2004

September 28, 2004

The NCEDC is gathering data related to the 2004 Parkfield earthquake and making them available for researchers. Data are coming in now and will continue to be collected over the next few days and weeks.

Information about the available data is here:

2004 Parkfield earthquake data

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 if you have questions or comments about these changes.

BDSN HH & HL data now continuous

September 25th, 2004

September 25, 2004

As of September 25, the NCEDC is archiving continuous data from the BDSN HH and HL channels. In the past, we had archived waveform snippets or triggers for events for the HH and HL channels, while archiving BH and lower data rates continuously (with a few exceptions such as after large earthquakes such as the Denali and San Simeon events).

With this change in policy, the NCEDC will archive all data transmitted to the BSL. In general, we will not make efforts to fill in missing data from the HH and HL channels, unless the gaps occur in a record of interest. Our usual efforts to provide continuous data for the other channels will be the same.

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 if you have questions or comments about these changes.

BDSN BH channels changed to 40 Hz sampling

June 15th, 2004

June 15, 2004

The BSL converted most - but not quite all - of the BDSN BH data streams from 20 samples per second to 40 samples per second at the beginning of the GMT day on June 15th (day 167). This change affects: BDM, BKS, BRIB (broadband sensor only), CMB, CVS, FARB, HOPS, HUMO, JCC, JRSC, MHC, MNRC, MOD, ORV, PACP, PKD, POTR, RFSB (surface strong-motion only), SAO, SCCB, WDC, and YBH. Stations BRK, KCC, and WENL will be converted at the beginning of day 168.

As a result of this upgrade, stations CMB and SCCB are currently down, but we anticipate that they will be back up shortly.

This change in sampling rate was made in order to be consistent with the USArray specifications. USArray is part of the Earthscope project to study the structure and evolution of the North American continent.

At this time, we do no intend to change the sampling rate of the BP channels associated with the BSL borehole networks - the NHFN, MPBO, and HRSN.

June 16, 2004 - update

We completed the migration of the remaining BDSN stations today - BRK, KCC, and WENL. In addition, both CMB and SCCB have been brought back online.

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 if you have questions or comments about these changes.

Discrepancy in magnitude from database search

June 14th, 2004

June 14, 2004

We have discovered an inconsistency between the magnitudes reported in the new database search of the UC Berkeley earthquake catalogs (http://www.ncedc.org/db/Search/PI/dbselect.html) and the older, flat file search ( http://www.ncedc.org/ncedc/catalog-search.html). The inconsistency arose during the conversion of the catalog from an older PC-based database. The magnitudes currently reported in the database search were computed using a older set of station adjustments and thus differ from the magnitudes reported in the flat file search.

We are currently looking into the best way to resolve this inconsistency. For the present, we advise users for whom magnitude is a critical parameter to use the flat file search.

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 if you have questions or comments about these changes.


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