Detwiler Fire impacts NC network stations

July 21st, 2017

UPDATE: The outage is over. As of 2017/07/26 2131 UTC most channels are seismic again (except those that were flat before the outage).

The 2017 fire season in underway and the Detwiler fire has disrupted communications from 19 stations in the Northern California Seismic Network (NCSN - network code NC). These sites provide sparse coverage in the south San Joaquin Valley from San Luis Reservoir to Coalinga on the west side and from Copperopolis to Visalia in the Sierra foothills. The stations affected by this outage include: BMS, BRM, HSL, MBE, MBU, MCUB, MHD, MMI, MMT, MPR, MRH, MYL, PAR, PDR, PHB,​ PJC, PJU, PKE, and PWM. Because these are analog stations digitized at a central site, their traces will appear as flat lines during this outage. The telemetry outage started 2017/07/18 0538 UTC (2017/07/17 2238 PDT).

Gap in BG (Geysers) data July 8-9, 2017

July 19th, 2017

On July 8, 2017, the NCSN experienced a wave server failure at its BG acquisition system.
Most of the data have been recovered except for the following time interval:
2017/07/08 05:00 (UTC) to 2017/07/09 08:00 (UTC)

NCEDC waveform server down from 11:00-13:00 PT today for system update

June 28th, 2017

The NCEDC waveform computer will be down form 11:00-13:00 PT today for
system update. NCEDC archive waveforms will NOT be available during this time.
Please plan accordingly.

NCEDC Catalogs snapshot available on Github

June 6th, 2017

The NCEDC is pleased to announce the availability of daily snapshots for the earthquake parameters catalog of the Northern California Seismic System through GitHub. This means that at any time the catalog can be retrieved as it was on a given date. The catalog repository is available at:

The files contain information from 1966 to present and are available in the EHP CSV format. For documentation on the format, please go to:

A current snapshot of these files can also be found at:

In the GitHub repository, a file 'index.txt' is provided that contains the mapping between the commit times and the hash keys. It can be used to retrieve a version of the catalog at a given time.

How to use the index file

This file contains entries similar to the following:

NCSS catalogs as of 2017-03-13 01:00:02 --> 4f3c8891402c14c260350afcde15f55d46f36974
NCSS catalogs as of 2017-03-12 01:00:01 --> 84e6697c9f7f482cc47751fada331dc1b360d4b3
NCSS catalogs as of 2017-03-11 01:00:01 --> 5a14aebedc36c05339d511ae9ae6190c37ff73b4
NCSS catalogs as of 2017-03-10 01:00:02 --> d1a3f36bd71b04dc175c7711409c5b9c2fc20454

For example, a snapshot of the catalog on 2017/03/11 13:00:00 would be available at:

Specific snapshots are available at:<HASH_KEY>

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

FISSURES DHI services to be retired (Jan 2017)

January 6th, 2017

The NCEDC provides a number of web services that provide improved functionality formerly provided by the FISSURES Data Handling Interface (DHI) system. FISSURES DHI, initially developed by IRIS, defined a client/server system for querying and delivering station and channel metadata as well as time series data. IRIS and all other data centers have already retired their FISSURES DHI services.

The FDSN-compatible and NCEDC web services are available at

The NCEDC will shut down its FISSURES DHI servers and primary DHI name server for DHI server lookups on Fri Jan 20 2017. Please contact the NCEDC at if you have any questions.

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