REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Fri Oct 31 16:56:39 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: 116
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
72335991 2014/10/31 01:50:49.940 38.82492 -122.80239 2.920 0.90 2 0.46 0A.1 tech 3D gE usgs GGF
72335986 2014/10/31 01:48:11.610 38.82212 -122.84637 2.259 0.80 1 0.32 0A.1 tech 3D gE usgs GGF
72335981 2014/10/31 01:33:58.420 37.88236 -121.57763 10.402 1.90 2 0.36 0A.1 tech 3D gE usgs
72335976 2014/10/31 00:53:4.720 36.76187 -121.26974 6.531 0.90 1 0.94 0A.1 tech 3D gE usgs
72335971 2014/10/30 23:51:9.320 36.52472 -121.08673 5.840 1.30 2 0.96 0A.1 tech 3D gE usgs
72335966 2014/10/30 23:45:49.370 38.82061 -122.76585 2.287 1.20 2 0.54 0A.1 tech 3D gE usgs GGF
72335961 2014/10/30 23:33:17.860 38.78737 -122.78349 3.742 0.90 1 0.71 0A.1 tech 3D gE usgs GGF
72335956 2014/10/30 23:16:2.800 38.66250 -121.71370 4.840 0.00 - - 0A.0 tech 3D gE usgs
72335951 2014/10/30 22:53:48.240 38.78426 -122.73547 1.627 0.50 1 4.81 0A.1 tech 3D gE usgs GGF
72335941 2014/10/30 22:40:56.840 38.83041 -122.88266 4.913 0.00 1 0.51 0A.1 tech 3D gE usgs GGF
72335936 2014/10/30 22:06:13.370 37.46965 -118.81502 6.442 1.50 1 1.14 1A.1 tech 3D gE usgs LVC
72335926 2014/10/30 21:27:12.880 37.47277 -118.78245 7.302 1.40 1 0.12 0A.1 tech 3D gE usgs LVC
72335921 2014/10/30 21:27:0.340 38.81205 -122.85619 3.300 0.40 2 2.24 0A.1 tech 3D gE usgs GGF
72335916 2014/10/30 21:24:39.280 38.82988 -122.80487 2.079 0.30 1 0.78 0A.1 tech 3D gE usgs GGF
72335891 2014/10/30 20:54:31.130 36.56194 -121.15594 2.534 1.00 2 0.20 0A.1 tech 3D gE usgs
72335886 2014/10/30 20:52:42.500 37.64570 -118.64850 4.820 0.70 - - 0A.0 tech 3D gE usgs LVC
72335881 2014/10/30 20:45:4.320 40.19044 -121.19936 2.536 1.90 2 0.30 0A.1 tech 3D gE usgs
72335876 2014/10/30 20:37:19.450 38.82401 -122.80129 2.775 0.80 1 0.51 0A.1 tech 3D gE usgs GGF
72335866 2014/10/30 20:16:57.600 37.75450 -123.26500 5.000 0.00 - - 0A.0 tech 3D gE usgs
72335851 2014/10/30 19:46:36.600 38.70880 -122.86980 16.920 0.00 - - 0A.0 tech 3D gE usgs

Events last re/processed:
72335991 2014/10/31 01:50:49.940 38.82492 -122.80239 2.920 0.90 2 0.46 0A.1 tech 3D gE usgs GGF
72335986 2014/10/31 01:48:11.610 38.82212 -122.84637 2.259 0.80 1 0.32 0A.1 tech 3D gE usgs GGF
72335981 2014/10/31 01:33:58.420 37.88236 -121.57763 10.402 1.90 2 0.36 0A.1 tech 3D gE usgs
71087574 2014/10/20 13:48:51.670 38.81596 -122.79370 4.484 0.10 1 1.64 5F.1 tech 3D gE usgs GGF
72330701 2014/10/20 13:48:11.790 38.75067 -122.73595 2.016 0.30 1 0.71 6F.1 tech 3D gE usgs GGF
72335976 2014/10/31 00:53:4.720 36.76187 -121.26974 6.531 0.90 1 0.94 0A.1 tech 3D gE usgs
72335836 2014/10/30 19:29:0.470 37.65207 -118.90006 2.579 0.80 1 0.58 2F.1 tech 3D gE usgs LVC
72335781 2014/10/30 16:52:9.120 37.49519 -118.67010 16.227 1.70 1 1.02 3F.1 tech 3D gE usgs LVC
72335736 2014/10/30 15:09:19.920 36.02357 -120.58610 1.138 0.90 2 0.40 2F.1 tech 3D gE usgs PKF
72335516 2014/10/30 03:43:1.190 37.62953 -118.92684 8.913 1.00 1 0.30 2F.1 tech 3D gE usgs LVC


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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.