SAFOD Continuous and Event data available at the NCEDC

January 9th, 2007

January 9th, 2007

The NCEDC is please to announce the availability of seismic data from the San Andreas Fault Observatory at Depth (SAFOD) component of the EarthScope Project. Earthscope is a Major Research Initiative of the National Science Foundation (NSF).

SAFOD is a deep borehole observatory that will directly measure the physical conditions under which plate boundary earthquakes occur. SAFOD is drilling and instrumenting an inclined borehole across the San Andreas Fault Zone to a depth of 3.2 km, targeting a repeating microearthquake source.

The NCEDC now has online over 800 GBytes of all available SAFOD seismic data from Jan 17, 2006 to November 16, 2006. This represents continuous seismic waveform data recording at 4000 Hz from geophones in both the SAFOD Main Hole and Pilot Hole as well as event and continuous waveforms from 250 Hz data channels acquired by the USGS Northern California Seismic Network (NCSN).

The NCEDC also has event waveform data from the SAFOD Pilot Hole from September 13, 2002 to May 30, 2004. In the near future, we will make available the remainder of SAFOD data event data from the 2004 through 2005, as well as a month of continuously recorded data of the September 28, 2004 Parkfield earthquake and its aftershocks.

The SAFOD event data and continuous 250 Hz data will be permanently archived online and permanently available from the NCEDC. The 250 Hz data is delivered in real-time to the NCEDC. The continuous 4000 Hz seismic data, stored on a multi-terabyte filesystem, will be treated as a large ring buffer, where the oldest data will eventually be taken offline to make room for newer continuous SAFOD data. The 4000 Hz data will be updated on a monthly basis as the data are delivered to the NCEDC.

All SAFOD data at the NCEDC are available through the normal NCEDC data request methods. These include NetDC, BREQ_FAST, FISSURES/DHI, STP, and the SeismiQuery web interface for data availability and instrument responses. See the following pages for more details concerning the SAFOD data set at the NCEDC.

The NCEDC also has event and continuous waveform data covering the same time periods from the Parkfield borehole High Resolution Seismic Network and the Northern California Seismic Network as well as the authoritative earthquake catalog for the region.

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.

MOBB preliminary OBS data available at the NCEDC

October 30th, 2006

October 30th, 2006

The NCEDC is pleased to announce the availability of preliminary seismic, current meter, pressure timeseries from the MOBB ocean bottom seismometer (OBS) system deployed in Monterey Bay, California. The MOBB site is a joint project of the UC Berkeley Seismological Laboratory (BSL)and the Monterey Bay Aquarium Research Institute (MBARI).

The preliminary data are available in daily MiniSEED format, and can be retrieve by either HTTP or FTP protocols from the following directories:

The preliminary data has NOT had time corrections applied to the data. Time corrected data will be incorporated into the the NCEDC archive as site MOBB in the BK network.

The NCEDC is a joint project of the University of California, Berkeley and the USGS, with facilities located at the University of California, Berkeley. Please send us email at ncedcinfo@ncedc.org or fill out our comments form if you have questions or comments about these changes.

PG&E seismic data available at the NCEDC

October 20th, 2006

October 16th, 2006

The NCEDC is pleased to announce the availability of seismic phase and waveform data from the Pacific Gas and Electric seismic network that monitors seismicity in the vicinity of the Diablo Canyon nuclear powerplant. The phase data, which begins in 10/1987, have been merged into the NCSN catalog, and the NCSN locations have been re-computed from the combined phase data set. PG stations can be recognized with their network code of "PG".

The PG&E data improves the accuracy of more than 11,000 earthquakes previously available in the NCSN catalog, the majority of which are aftershocks of the San Simeon and Parkfield earthquakes. It also includes approximately 1000 new hypocenters for these two earthquake sequences. As of 2006/09/05, waveforms from all PG&E stations in the Diablo Canyon region are being imported by the NCSN and SCSN in real-time and reflected in the hypocenters and waveform data archived at the NCEDC and SCEDC.

The California Integrated Seismic Network greatly appreciates the cooperation of PG&E in monitoring earthquakes in California and their willingess to make this data set available to the public.

The NCEDC is a joint project of the University of California, Berkeley and the USGS, with facilities located at the University of California, Berkeley. Please send us email at ncedcinfo@ncedc.org or fill out our comments form if you have questions or comments about these changes.

NCEDC reorganizes EarthScope PBO strain data directory structure

March 17th, 2006

March 17th, 2006

The Northern California Earthquake Data Center has reorganized its directory structure for EarthScope Plate Boundary Observatory (PBO) raw and processed strain data in accordance with standards established by the Plate Boundary Observatory, operated by UNAVCO, Inc.

The new directory structure places all data for PBO strain site within a directory named for the site. Data are further divided into yearly directories, and for raw data, into daily directories. The following table provides top level links to each type of data.

PBO Data Type
URL
Raw borehole strain data /pbo/strain/raw/bsm/
Raw laser strain /pbo/strain/raw/lsm/
Processed borehole strain data /pbo/strain/procssed/bsm/
Processed laser strain data /pbo/strain/processed/lsm/

strain data at the NCEDC can be found at the NCEDC PBO strain data page.

The NCEDC is a joint project of the University of California, Berkeley and the USGS, with facilities located at the University of California, Berkeley. Please send us email at ncedcinfo@ncedc.org or fill out our comments form if you have questions or comments about these changes.

NCEDC adopts NCEDC.ORG domain name

September 14th, 2005

September 14th, 2005

The Northern California Earthquake Data Center is pleased to announce the acquisition and use of the domain name NCEDC.ORG for the its network facilities. The NCEDC web pages are now available at http://www.ncedc.org/, and all the webmaster can be reached at ncedcinfo@ncedc.org. Email for automated data requests should be sent to:

Email Data Requests
NetDC netdc@ncedc.org
BREQ_FAST breq_fast@ncedc.org
EVT_FAST evt_fast@ncedc.org

The previous NCEDC email addresses and URLs will continue to work.

The NCEDC is a joint project of the University of California, Berkeley and the USGS, with facilities located at the University of California, Berkeley. 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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