REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sat Aug 1 22:01:54 UTC 2015    [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
2015: 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
72498916 2015/08/01 21:28:13.380 38.77613 -122.72340 4.171 1.20 1 1.41 0A.1 tech 3D gE usgs GGF
72498911 2015/08/01 20:59:14.480 37.48453 -118.84373 8.815 1.20 1 0.43 0A.1 tech 3D gE usgs LVC
72498901 2015/08/01 20:14:28.610 37.25647 -121.64046 5.283 1.60 1 0.21 1A.1 tech 3D gE usgs CAL
72498896 2015/08/01 19:49:50.010 37.60404 -118.78503 8.134 1.20 1 0.77 0A.1 tech 3D gE usgs LVC
72498886 2015/08/01 18:54:55.100 38.82452 -122.82673 2.966 1.40 2 0.27 1A.1 tech 3D gE usgs GGF
72498866 2015/08/01 18:42:39.300 41.88570 -121.49500 5.430 3.40 - - 0A.0 tech 3D gE usgs
72498851 2015/08/01 18:31:46.190 37.48427 -118.84397 8.864 1.00 1 0.93 0A.1 tech 3D gE usgs LVC
72498846 2015/08/01 18:25:41.440 38.86810 -122.80875 9.301 0.90 2 3.79 0A.1 tech 3D gE usgs GGF
72498836 2015/08/01 17:57:18.500 35.75620 -120.31570 10.270 1.10 - - 0A.0 tech 3D gE usgs
72498826 2015/08/01 17:01:26.130 38.84320 -122.83573 1.453 0.20 2 0.06 0A.1 tech 3D gE usgs GGF
72498821 2015/08/01 16:54:43.920 38.84107 -122.82020 0.924 1.50 2 0.15 1A.1 tech 3D gE usgs GGF
72498811 2015/08/01 15:34:28.630 37.43603 -118.61497 10.392 1.20 1 0.27 0A.1 tech 3D gE usgs LVC
72498806 2015/08/01 15:27:19.100 35.87770 -120.29900 9.830 0.00 - - 0A.0 tech 3D gE usgs
72498801 2015/08/01 14:47:52.680 37.78309 -122.13232 8.950 1.20 1 1.07 0A.1 tech 3D gE usgs HAY
72498786 2015/08/01 13:16:40.910 38.75674 -122.73405 3.077 1.60 1 0.52 1A.1 tech 3D gE usgs GGF
72498776 2015/08/01 13:01:53.640 38.85938 -122.89961 3.683 0.60 2 0.09 0A.1 tech 3D gE usgs GGF
72498771 2015/08/01 12:53:19.990 36.61891 -121.14038 9.568 0.90 1 1.69 0A.1 tech 3D gE usgs
72498756 2015/08/01 12:15:28.810 38.82637 -122.80630 0.051 1.00 2 0.92 0A.1 tech 3D gE usgs GGF
72498751 2015/08/01 12:04:22.120 38.84506 -122.84093 3.182 0.50 2 0.41 0A.1 tech 3D gE usgs GGF
72498746 2015/08/01 11:52:42.860 37.73710 -122.12454 7.203 2.60 1 0.96 1A.1 tech 3D gE usgs HAY

Events last re/processed:
72498916 2015/08/01 21:28:13.380 38.77613 -122.72340 4.171 1.20 1 1.41 0A.1 tech 3D gE usgs GGF
72498911 2015/08/01 20:59:14.480 37.48453 -118.84373 8.815 1.20 1 0.43 0A.1 tech 3D gE usgs LVC
72498901 2015/08/01 20:14:28.610 37.25647 -121.64046 5.283 1.60 1 0.21 1A.1 tech 3D gE usgs CAL
72498896 2015/08/01 19:49:50.010 37.60404 -118.78503 8.134 1.20 1 0.77 0A.1 tech 3D gE usgs LVC
72498886 2015/08/01 18:54:55.100 38.82452 -122.82673 2.966 1.40 2 0.27 1A.1 tech 3D gE usgs GGF
72498866 2015/08/01 18:42:39.300 41.88570 -121.49500 5.430 3.40 - - 0A.0 tech 3D gE usgs
72498851 2015/08/01 18:31:46.190 37.48427 -118.84397 8.864 1.00 1 0.93 0A.1 tech 3D gE usgs LVC
72498846 2015/08/01 18:25:41.440 38.86810 -122.80875 9.301 0.90 2 3.79 0A.1 tech 3D gE usgs GGF
72498836 2015/08/01 17:57:18.500 35.75620 -120.31570 10.270 1.10 - - 0A.0 tech 3D gE usgs
72498826 2015/08/01 17:01:26.130 38.84320 -122.83573 1.453 0.20 2 0.06 0A.1 tech 3D gE usgs GGF


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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.