REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Wed Feb 10 17:32:06 UTC 2016    [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:
2015-08-17 M4.0 Fremont
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
2015: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2016: 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
72588945 2016/02/10 16:32:36.630 36.08944 -120.20345 6.104 2.90 2 3.27 1A.1 tech 3D gE usgs
72588935 2016/02/10 16:13:18.960 37.57600 -118.85306 7.520 0.90 1 2.52 0A.1 tech 3D gE usgs LVC
72588925 2016/02/10 16:01:34.210 38.79606 -122.82786 6.336 0.50 2 1.70 0A.1 tech 3D gE usgs GGF
72588910 2016/02/10 14:42:53.080 37.57483 -118.85369 7.470 1.10 2 2.28 0A.1 tech 3D gE usgs LVC
72588905 2016/02/10 14:22:31.790 38.81242 -122.82819 3.365 1.20 1 1.14 1A.1 tech 3D gE usgs GGF
72588900 2016/02/10 14:13:16.960 37.70498 -118.88490 0.290 0.90 2 0.59 0A.1 tech 3D gE usgs LVC
72588895 2016/02/10 13:49:25.050 38.80360 -122.81148 1.714 1.80 1 0.97 1A.1 tech 3D gE usgs GGF
72588890 2016/02/10 13:45:37.260 38.80394 -122.81131 1.637 1.30 2 1.11 1A.1 tech 3D gE usgs GGF
72588885 2016/02/10 13:34:29.860 35.92530 -120.48880 9.790 1.00 - - 0A.0 tech 3D gE usgs
72588880 2016/02/10 13:20:27.220 38.76030 -122.73046 3.237 0.50 2 3.25 0A.1 tech 3D gE usgs GGF
72588870 2016/02/10 13:04:4.700 37.57507 -118.85323 7.500 1.20 1 2.33 0A.1 tech 3D gE usgs LVC
72588865 2016/02/10 12:53:56.070 38.81915 -122.84994 8.293 0.60 2 1.72 0A.1 tech 3D gE usgs GGF
72588860 2016/02/10 11:28:42.800 38.81352 -122.83056 3.547 1.40 2 0.85 0A.1 tech 3D gE usgs GGF
72588855 2016/02/10 10:39:23.140 39.10300 -122.93280 4.160 0.00 - - 0A.0 tech 3D gE usgs
72588850 2016/02/10 10:29:50.100 36.96814 -121.45652 5.913 1.20 1 0.70 0A.1 tech 3D gE usgs
72588840 2016/02/10 10:23:53.600 38.82886 -122.75890 1.315 0.50 1 0.55 0A.1 tech 3D gE usgs GGF
72588845 2016/02/10 10:23:33.300 37.57807 -118.84656 8.031 0.00 2 3.09 2F.1 tech 3D gE usgs LVC
72588820 2016/02/10 08:21:47.130 38.82875 -122.74478 1.446 1.00 2 0.60 0A.1 tech 3D gE usgs GGF
72588815 2016/02/10 08:14:24.760 38.81866 -122.81995 3.863 0.40 2 1.10 0A.1 tech 3D gE usgs GGF
72588810 2016/02/10 08:12:14.490 36.86238 -121.59076 5.995 1.20 1 1.04 0A.1 tech 3D gE usgs

Events last re/processed:
72588845 2016/02/10 10:23:33.300 37.57807 -118.84656 8.031 0.00 2 3.09 2F.1 tech 3D gE usgs LVC
72588735 2016/02/10 03:15:12.760 37.63880 -118.87670 -1.280 0.20 - - 4F.0 tech 3D gE usgs LVC
72588735 2016/02/10 03:15:12.760 37.63880 -118.87670 -1.280 0.20 - - 4F.0 tech 3D gE usgs LVC
72588730 2016/02/10 03:11:48.900 37.65888 -119.44666 3.842 1.50 2 0.32 2F.1 tech 3D gE usgs
72588945 2016/02/10 16:32:36.630 36.08944 -120.20345 6.104 2.90 2 3.27 1A.1 tech 3D gE usgs
72588935 2016/02/10 16:13:18.960 37.57600 -118.85306 7.520 0.90 1 2.52 0A.1 tech 3D gE usgs LVC
72588925 2016/02/10 16:01:34.210 38.79606 -122.82786 6.336 0.50 2 1.70 0A.1 tech 3D gE usgs GGF
72588910 2016/02/10 14:42:53.080 37.57483 -118.85369 7.470 1.10 2 2.28 0A.1 tech 3D gE usgs LVC
72588905 2016/02/10 14:22:31.790 38.81242 -122.82819 3.365 1.20 1 1.14 1A.1 tech 3D gE usgs GGF
72588900 2016/02/10 14:13:16.960 37.70498 -118.88490 0.290 0.90 2 0.59 0A.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.