BSL earthquake catalog available in database

December 19th, 2003

December 19, 2003

The NCEDC is gradually converting the Northern California earthquake catalogs from "flat files" to a database structure. At present, the BSL BDSN catalog is transferred from 1984-present and the information is accessible through a search interface here:

As part of this conversion, the "flat file" search of the BSL catalog available here is no longer being kept up to date. Please access the new database search for access to the most current catalog from the BSL.

We are currently working to convert the USGS earthquake catalog to the database structure. This should be available in the next few months.

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.

Problem with Schumann resonance calculations resolved

December 1st, 2003

December 01, 2003

The NCEDC resolved software problems associated with the computation of magnetic activity and Schumann resonance. Computations resumed in July 2003 and are ongoing. We apologize for the late notification!

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.

Disk drive died with NetDC, BREQ_FAST, and EVT_FAST requests

October 28th, 2003

October 28, 2003

During a computer upgrade at the NCEDC, the disk drive holding the current queue of NetDC, BREQ_FAST, and EVT_FAST request died. We restored the filesystem from backup tapes, but are unable to recover any unprocessed requests. If you recently submitted a request for data and did not receive a reply with the data's URL for pickup, please resubmit your request.

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.

Modifications to the FIR filters on the BDSN and Mini-PBO Q4120 dataloggers

June 30th, 2003

June 30, 2003

The BDSN and MiniPBO Q4120 Quanterras will be reconfigured and rebooted at 5 pm PST today (July 1, 00:00 UTC) in order to change the FIR filter for the 100 Hz channels from acausal to causal. The affected stations are:

BDSN

  • BDM
  • CVS
  • FARB
  • PACP
  • POTP
  • POTR
  • WENL
  • HUMO

MiniPBO

  • OHLN
  • SBRN

The new BDSN Q4120 station MNRC was upgraded yesterday, since it is a new station and continuous telemetry has not yet been installed.

This change is motivated by the desire to improve phase picking on the 100 Hz channels. This writeup by Bob Uhrhammer and Bob Nadeau describes how the change affects the data.

This change means that all Q4120/Q730 dataloggers operated by the BSL will use causal filters for sampling rates of 100 Hz and higher (The HRSN and NHFN have traditionally used causal filters for the higher sampling rates). Lower data rates will continue to use the acausal filters. This change does NOT apply to the BDSN sites with Q680/980 dataloggers, as they cannot be configured for causal filtering.

Updated instrument responses will be available soon.

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.

NCEDC rebuilding mass store filesystem

April 23rd, 2003

April 23, 2003

The NCEDC is in the process of rebuilding the mass store file system. As a result, certain filesystems are unavailable at this time. The process will take place over the next few days.

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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