REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Mon Mar 2 07:11:45 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
72404070 2015/03/02 06:51:59.580 38.83651 -122.84677 1.095 0.80 2 0.25 0A.1 tech 3D gE usgs GGF
72404055 2015/03/02 06:31:16.940 38.81804 -122.84840 1.332 0.50 2 2.39 0A.1 tech 3D gE usgs GGF
72404050 2015/03/02 06:24:13.630 38.82043 -122.82696 1.191 0.40 2 0.26 0A.1 tech 3D gE usgs GGF
72404040 2015/03/02 06:05:15.480 38.82628 -122.80618 3.214 0.50 1 0.16 0A.1 tech 3D gE usgs GGF
72404030 2015/03/02 06:01:55.870 38.79430 -122.77707 0.003 0.50 1 0.80 0A.1 tech 3D gE usgs GGF
72404020 2015/03/02 05:55:59.480 38.78834 -122.86448 10.223 0.00 2 4.32 0A.1 tech 3D gE usgs GGF
72404015 2015/03/02 05:55:48.300 38.36800 -122.95230 23.630 0.00 - - 0A.0 tech 3D gE usgs
72404010 2015/03/02 05:55:20.280 38.79469 -122.78184 0.759 0.40 2 0.25 0A.1 tech 3D gE usgs GGF
72403985 2015/03/02 05:54:5.210 38.79412 -122.77979 1.374 2.30 1 1.34 1A.1 tech 3D gE usgs GGF
72404000 2015/03/02 05:54:47.320 38.82159 -122.85016 2.251 0.70 2 0.68 0A.1 tech 3D gE usgs GGF
72403995 2015/03/02 05:54:34.120 38.79605 -122.77991 0.986 0.60 2 0.31 0A.1 tech 3D gE usgs GGF
72403990 2015/03/02 05:54:22.650 38.79421 -122.78242 0.377 0.90 1 0.59 0A.1 tech 3D gE usgs GGF
72403980 2015/03/02 05:08:40.000 38.83869 -122.84251 2.846 0.90 2 0.41 0A.1 tech 3D gE usgs GGF
72403960 2015/03/02 03:45:10.010 38.82220 -122.77875 2.168 0.50 1 0.20 0A.1 tech 3D gE usgs GGF
72403955 2015/03/02 03:05:58.480 37.80369 -122.19466 8.583 1.70 1 0.65 1A.1 tech 3D gE usgs HAY
72403945 2015/03/02 02:40:8.450 38.47514 -122.44986 4.885 0.00 2 0.23 0A.1 tech 3D gE usgs
72403940 2015/03/02 02:24:8.600 35.93350 -120.47350 6.250 0.70 - - 0A.0 tech 3D gE usgs
72403920 2015/03/02 01:24:39.930 38.77352 -122.71811 2.287 0.60 1 0.46 0A.1 tech 3D gE usgs GGF
72403915 2015/03/02 01:20:55.160 36.68838 -121.32110 3.592 1.40 1 0.16 0A.1 tech 3D gE usgs
72403885 2015/03/01 23:30:38.100 38.19730 -122.46500 5.000 0.00 - - 0A.0 tech 3D gE usgs

Events last re/processed:
72404070 2015/03/02 06:51:59.580 38.83651 -122.84677 1.095 0.80 2 0.25 0A.1 tech 3D gE usgs GGF
72404055 2015/03/02 06:31:16.940 38.81804 -122.84840 1.332 0.50 2 2.39 0A.1 tech 3D gE usgs GGF
72404050 2015/03/02 06:24:13.630 38.82043 -122.82696 1.191 0.40 2 0.26 0A.1 tech 3D gE usgs GGF
72404040 2015/03/02 06:05:15.480 38.82628 -122.80618 3.214 0.50 1 0.16 0A.1 tech 3D gE usgs GGF
72404030 2015/03/02 06:01:55.870 38.79430 -122.77707 0.003 0.50 1 0.80 0A.1 tech 3D gE usgs GGF
72404020 2015/03/02 05:55:59.480 38.78834 -122.86448 10.223 0.00 2 4.32 0A.1 tech 3D gE usgs GGF
72404015 2015/03/02 05:55:48.300 38.36800 -122.95230 23.630 0.00 - - 0A.0 tech 3D gE usgs
72404010 2015/03/02 05:55:20.280 38.79469 -122.78184 0.759 0.40 2 0.25 0A.1 tech 3D gE usgs GGF
72403985 2015/03/02 05:54:5.210 38.79412 -122.77979 1.374 2.30 1 1.34 1A.1 tech 3D gE usgs GGF
72403995 2015/03/02 05:54:34.120 38.79605 -122.77991 0.986 0.60 2 0.31 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.