REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Tue Sep 2 09:01:45 UTC 2014    [DD-RT Version 2.0 | Contact: felixw@ldeo.columbia.edu]

CHANGE NOTE: Events after 2013/10/16 are computed with updated software (v2.0) and base catalog (NCAeqDD.201112.1).

How it works:
This website displays automatic near-real-time double-difference (DD-RT) hypocenter locations for earthquakes recorded in northern California and routinely processed at the Northern California Seismic Network (NCSN). The DD-RT process relocates new earthquakes relative to a high-resolution DD catalog of background seismicity, NCAeqDD, by using differential times between the new event and its neighboring (reference) events in the DD catalog. Routinely determined parametric data of new events, such as phase picks and hypocentral information, are automatically sent to LDEO by the NCSN and waveforms are accessed from the real-time DART server at the Northern California Earthquake Data Center (NCEDC) in Berkeley. Data associated with the reference events are accessed from a locally stored copy of the entire Northern CA seismic archive. See Waldhauser (BSSA, 2009) for more information. This web site is updated every 10 minutes.

Faults of special interest:
Hayward Fault | Calaveras Fault | Parkfield

Earthquakes of special interest:
2014-08-24 M6.0 South Napa
2012-10-21 M5.3 King City
2012-08-06 M4.4 Parkfield
2011-10-20 M4.0 Berkeley

Archived DDRT solutions:
2012: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2013: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2014: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

Downloads:
Download the real-time double-difference catalog, Jan 2012 - present, here .
Download the double-difference base catalog, 1984-2011, here.
Search either catalog here.

Most recent events:
Events in queue: 0
Q: Quality of DDRT solution; DX: Shift between DD and network location (km); V: version (CISN.DD)
If Q='-': No DDRT solution computed.
tech: link to technical information; 3D: link to 3D viewer; gE: link to google Earth viewer
Faults/regions of special interest:
HAY = Hayward Fault; CAL = Calaveras Fault; PKF = Parkfield; LVC = Long Valley;
GGF = Geysers Geothermal Field; MTJ = Mendocino TJ

EVENT ID DATE TIME (UTC) LAT LON DEPTH ML Q DX V
72290126 2014/09/02 07:46:54.460 38.81002 -122.81907 3.758 0.50 2 0.52 0A.1 tech 3D gE usgs GGF
72290111 2014/09/02 07:23:38.900 36.22220 -120.57020 5.240 1.80 - - 0A.0 tech 3D gE usgs
72290096 2014/09/02 07:00:11.900 38.67030 -122.99000 15.620 0.30 - - 0A.0 tech 3D gE usgs
72290071 2014/09/02 06:49:1.800 39.11000 -121.57500 4.990 0.00 - - 0A.0 tech 3D gE usgs
72290066 2014/09/02 06:44:1.900 36.18620 -119.98200 27.400 2.30 - - 0A.0 tech 3D gE usgs
72290056 2014/09/02 06:36:14.900 36.97527 -121.46485 5.226 1.30 1 0.27 0A.1 tech 3D gE usgs
72290041 2014/09/02 06:34:21.460 37.43164 -121.77271 10.370 1.20 1 0.51 0A.1 tech 3D gE usgs CAL
72290031 2014/09/02 06:30:47.470 38.81924 -122.79904 4.714 1.00 1 0.53 1A.1 tech 3D gE usgs GGF
72290021 2014/09/02 06:22:18.000 36.79750 -120.15020 7.230 1.70 - - 0A.0 tech 3D gE usgs
72290006 2014/09/02 05:46:55.300 33.71280 -116.77370 18.110 2.10 - - 0A.0 tech 3D gE usgs
72289991 2014/09/02 04:55:35.160 38.79473 -122.74707 1.970 0.60 1 0.28 0A.1 tech 3D gE usgs GGF
72289986 2014/09/02 04:35:56.000 36.02320 -120.62450 1.840 0.00 - - 0A.0 tech 3D gE usgs
72289976 2014/09/02 03:54:36.260 38.78786 -122.81326 4.200 0.10 2 1.61 0A.1 tech 3D gE usgs GGF
72289966 2014/09/02 03:45:10.770 38.80678 -122.81191 3.028 0.40 2 0.20 0A.1 tech 3D gE usgs GGF
72289956 2014/09/02 03:33:48.960 37.52871 -118.82984 7.397 1.30 1 0.62 0A.1 tech 3D gE usgs LVC
72289951 2014/09/02 03:32:35.700 38.86445 -122.79442 1.817 0.20 2 0.67 0A.1 tech 3D gE usgs GGF
72289941 2014/09/02 02:39:50.210 36.57432 -121.14928 7.753 1.10 1 0.50 0A.1 tech 3D gE usgs
72289931 2014/09/02 02:12:29.590 38.83873 -122.83938 2.470 0.80 2 0.09 0A.1 tech 3D gE usgs GGF
72289921 2014/09/02 01:33:3.420 36.68927 -121.32299 6.416 0.70 1 0.49 0A.1 tech 3D gE usgs
72289916 2014/09/02 00:46:38.150 36.98343 -121.46376 5.491 2.00 1 0.63 1A.1 tech 3D gE usgs

Events last re/processed:
72290126 2014/09/02 07:46:54.460 38.81002 -122.81907 3.758 0.50 2 0.52 0A.1 tech 3D gE usgs GGF
72290111 2014/09/02 07:23:38.900 36.22220 -120.57020 5.240 1.80 - - 0A.0 tech 3D gE usgs
72290096 2014/09/02 07:00:11.900 38.67030 -122.99000 15.620 0.30 - - 0A.0 tech 3D gE usgs
72290071 2014/09/02 06:49:1.800 39.11000 -121.57500 4.990 0.00 - - 0A.0 tech 3D gE usgs
72290066 2014/09/02 06:44:1.900 36.18620 -119.98200 27.400 2.30 - - 0A.0 tech 3D gE usgs
72290056 2014/09/02 06:36:14.900 36.97527 -121.46485 5.226 1.30 1 0.27 0A.1 tech 3D gE usgs
72290041 2014/09/02 06:34:21.460 37.43164 -121.77271 10.370 1.20 1 0.51 0A.1 tech 3D gE usgs CAL
72290031 2014/09/02 06:30:47.470 38.81924 -122.79904 4.714 1.00 1 0.53 1A.1 tech 3D gE usgs GGF
72290021 2014/09/02 06:22:18.000 36.79750 -120.15020 7.230 1.70 - - 0A.0 tech 3D gE usgs
72290006 2014/09/02 05:46:55.300 33.71280 -116.77370 18.110 2.10 - - 0A.0 tech 3D gE usgs


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Data sources: U.S. Geological Survey, Menlo Park; University of California, Berkeley; California Institute of Technology; University of Nevada, Reno; California Division of Water Resources; University of Utah; University of Southern California. Real-time data from the Northern California Seismic Network (NCSN) (parametric) and the Northern California Earthquake Data Center (NCEDC) (waveforms).
Project funded by USGS under its NEHRP program (06HQGR0054,08HQGR0043).
Website developed and maintained by Felix Waldhauser and Ben Engebreth at LDEO, Columbia University.