REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Fri Jul 19 14:34:31 UTC 2019    [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
2017: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2018: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2019: 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: 1
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
73228851 2019/07/19 14:19:25.260 37.45037 -118.41657 2.011 1.50 2 1.73 0A.1 tech 3D gE usgs
73228826 2019/07/19 13:49:17.780 38.82597 -122.81060 3.028 0.70 2 1.02 0A.1 tech 3D gE usgs GGF
73228821 2019/07/19 13:48:36.400 38.80640 -122.82475 3.351 1.30 2 1.34 0A.1 tech 3D gE usgs GGF
73228811 2019/07/19 13:38:27.250 36.33820 -121.05270 17.530 1.70 - - 0A.0 tech 3D gE usgs
73228796 2019/07/19 13:34:4.370 38.18650 -123.61000 4.230 0.00 - - 0A.0 tech 3D gE usgs
73228766 2019/07/19 13:11:37.470 38.75349 -122.72428 2.659 1.20 2 1.04 0A.1 tech 3D gE usgs GGF
73228751 2019/07/19 13:02:6.620 38.65672 -122.78722 1.556 1.00 2 0.74 0A.1 tech 3D gE usgs
73228711 2019/07/19 11:49:19.110 38.75388 -122.72148 3.182 1.30 1 0.55 0A.1 tech 3D gE usgs GGF
73228661 2019/07/19 10:21:35.750 38.81041 -122.79172 11.851 0.60 2 0.57 0A.1 tech 3D gE usgs GGF
73228646 2019/07/19 10:16:25.340 35.52916 -120.83180 5.755 1.90 2 0.17 0A.1 tech 3D gE usgs
73228636 2019/07/19 10:07:40.350 38.83129 -122.75796 1.472 0.80 2 1.16 0A.1 tech 3D gE usgs GGF
73228621 2019/07/19 10:05:32.340 38.80487 -122.82266 3.985 0.90 2 1.93 0A.1 tech 3D gE usgs GGF
73228616 2019/07/19 10:02:3.220 38.79969 -122.82373 3.094 0.40 1 1.31 0A.1 tech 3D gE usgs GGF
73228606 2019/07/19 09:53:22.980 38.81311 -122.78648 3.908 1.70 1 1.13 0A.1 tech 3D gE usgs GGF
73228541 2019/07/19 08:47:3.960 36.70180 -118.36850 26.460 2.90 - - 0A.0 tech 3D gE usgs
73228526 2019/07/19 08:13:57.920 38.75247 -122.72260 2.155 0.60 2 0.78 0A.1 tech 3D gE usgs GGF
73228516 2019/07/19 08:04:50.310 38.84102 -122.82768 2.532 2.30 2 0.52 0A.1 tech 3D gE usgs GGF
73228506 2019/07/19 07:57:38.020 37.46951 -118.83965 5.890 1.60 1 0.28 0A.1 tech 3D gE usgs LVC
73228491 2019/07/19 07:51:22.290 37.44991 -118.87690 4.729 2.80 1 1.63 0A.1 tech 3D gE usgs LVC
73228471 2019/07/19 07:05:25.980 38.81761 -122.75434 0.814 0.20 2 1.64 0A.1 tech 3D gE usgs GGF

Events last re/processed:
73228851 2019/07/19 14:19:25.260 37.45037 -118.41657 2.011 1.50 2 1.73 0A.1 tech 3D gE usgs
73228826 2019/07/19 13:49:17.780 38.82597 -122.81060 3.028 0.70 2 1.02 0A.1 tech 3D gE usgs GGF
73228821 2019/07/19 13:48:36.400 38.80640 -122.82475 3.351 1.30 2 1.34 0A.1 tech 3D gE usgs GGF
73228811 2019/07/19 13:38:27.250 36.33820 -121.05270 17.530 1.70 - - 0A.0 tech 3D gE usgs
73228796 2019/07/19 13:34:4.370 38.18650 -123.61000 4.230 0.00 - - 0A.0 tech 3D gE usgs
73228766 2019/07/19 13:11:37.470 38.75349 -122.72428 2.659 1.20 2 1.04 0A.1 tech 3D gE usgs GGF
73228751 2019/07/19 13:02:6.620 38.65672 -122.78722 1.556 1.00 2 0.74 0A.1 tech 3D gE usgs
73228711 2019/07/19 11:49:19.110 38.75388 -122.72148 3.182 1.30 1 0.55 0A.1 tech 3D gE usgs GGF
73228661 2019/07/19 10:21:35.750 38.81041 -122.79172 11.851 0.60 2 0.57 0A.1 tech 3D gE usgs GGF
73228646 2019/07/19 10:16:25.340 35.52916 -120.83180 5.755 1.90 2 0.17 0A.1 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.