REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Fri Nov 16 16:23:36 UTC 2018    [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

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
73111651 2018/11/16 16:08:1.110 38.02580 -122.28400 10.540 0.80 - - 0A.0 tech 3D gE usgs
73111636 2018/11/16 15:25:33.870 38.80670 -122.81199 2.792 1.70 2 1.19 0A.1 tech 3D gE usgs GGF
73111626 2018/11/16 14:46:51.580 36.86471 -121.59681 7.140 1.00 1 1.21 0A.1 tech 3D gE usgs
73111611 2018/11/16 13:33:3.730 38.82592 -122.80264 3.126 0.70 2 1.20 0A.1 tech 3D gE usgs GGF
73111606 2018/11/16 12:57:54.270 38.82684 -122.79863 4.012 1.60 2 1.42 0A.1 tech 3D gE usgs GGF
73111601 2018/11/16 12:52:23.870 38.85384 -122.79660 6.994 0.00 2 0.33 0A.1 tech 3D gE usgs GGF
73111586 2018/11/16 12:13:2.710 38.83696 -122.79254 1.812 1.00 2 0.47 0A.1 tech 3D gE usgs GGF
73111576 2018/11/16 11:41:3.820 38.83878 -122.78283 2.445 1.40 2 0.91 0A.1 tech 3D gE usgs GGF
73111571 2018/11/16 11:36:13.640 38.81276 -122.82041 2.628 1.10 2 0.61 0A.1 tech 3D gE usgs GGF
73111546 2018/11/16 10:46:9.930 38.82601 -122.85601 2.970 0.90 2 1.29 0A.1 tech 3D gE usgs GGF
73111541 2018/11/16 09:30:56.820 38.78872 -122.76222 2.288 0.60 2 1.32 0A.1 tech 3D gE usgs GGF
73111521 2018/11/16 08:51:45.500 37.41684 -121.76807 5.835 1.80 1 0.82 0A.1 tech 3D gE usgs CAL
73111516 2018/11/16 08:43:10.380 40.27280 -124.34380 17.160 2.70 - - 0A.0 tech 3D gE usgs MTJ
73111511 2018/11/16 08:28:14.480 38.04501 -122.29225 6.869 1.60 1 0.45 0A.1 tech 3D gE usgs
73111506 2018/11/16 08:11:44.550 38.75961 -122.72956 2.125 0.70 1 0.65 0A.1 tech 3D gE usgs GGF
73111501 2018/11/16 08:10:55.200 38.75794 -122.73071 2.255 2.50 2 0.90 0A.1 tech 3D gE usgs GGF
73111481 2018/11/16 06:05:38.790 37.28569 -122.22510 1.745 1.90 2 1.10 0A.1 tech 3D gE usgs
73111476 2018/11/16 05:45:39.410 38.79775 -122.86589 5.122 0.00 2 1.42 0A.1 tech 3D gE usgs GGF
73111456 2018/11/16 03:32:30.030 35.61330 -121.50050 0.270 2.00 - - 0A.0 tech 3D gE usgs
73111451 2018/11/16 03:28:38.290 38.82025 -122.79811 3.894 0.40 2 0.74 0A.1 tech 3D gE usgs GGF

Events last re/processed:
73111651 2018/11/16 16:08:1.110 38.02580 -122.28400 10.540 0.80 - - 0A.0 tech 3D gE usgs
73109931 2018/11/12 15:34:27.480 36.55907 -121.13944 9.750 0.70 1 1.42 2F.1 tech 3D gE usgs
73111636 2018/11/16 15:25:33.870 38.80670 -122.81199 2.792 1.70 2 1.19 0A.1 tech 3D gE usgs GGF
73111626 2018/11/16 14:46:51.580 36.86471 -121.59681 7.140 1.00 1 1.21 0A.1 tech 3D gE usgs
73111611 2018/11/16 13:33:3.730 38.82592 -122.80264 3.126 0.70 2 1.20 0A.1 tech 3D gE usgs GGF
73111606 2018/11/16 12:57:54.270 38.82684 -122.79863 4.012 1.60 2 1.42 0A.1 tech 3D gE usgs GGF
73111601 2018/11/16 12:52:23.870 38.85384 -122.79660 6.994 0.00 2 0.33 0A.1 tech 3D gE usgs GGF
73111586 2018/11/16 12:13:2.710 38.83696 -122.79254 1.812 1.00 2 0.47 0A.1 tech 3D gE usgs GGF
73111576 2018/11/16 11:41:3.820 38.83878 -122.78283 2.445 1.40 2 0.91 0A.1 tech 3D gE usgs GGF
73111571 2018/11/16 11:36:13.640 38.81276 -122.82041 2.628 1.10 2 0.61 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.