REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Wed Jan 18 07:53:39 UTC 2017    [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
72753665 2017/01/18 07:42:1.480 37.52139 -118.84452 13.512 1.40 1 7.08 0A.1 tech 3D gE usgs LVC
72753660 2017/01/18 07:29:48.900 38.78581 -122.73497 2.204 1.60 2 0.58 0A.1 tech 3D gE usgs GGF
72753655 2017/01/18 07:29:43.850 38.78531 -122.73424 2.225 1.90 2 0.57 0A.1 tech 3D gE usgs GGF
72753650 2017/01/18 07:16:17.350 35.86330 -120.42620 5.100 0.00 - - 0A.0 tech 3D gE usgs
72753630 2017/01/18 06:00:42.110 38.84030 -122.83178 1.967 0.70 1 0.60 0A.1 tech 3D gE usgs GGF
72753625 2017/01/18 05:59:51.160 38.84031 -122.83007 1.998 0.90 2 0.97 0A.1 tech 3D gE usgs GGF
72753620 2017/01/18 05:59:41.750 38.83915 -122.83273 2.071 0.80 2 0.59 0A.1 tech 3D gE usgs GGF
72753615 2017/01/18 05:59:36.160 38.85011 -122.83162 0.520 1.60 2 1.37 0A.1 tech 3D gE usgs GGF
72753605 2017/01/18 05:16:30.350 38.75024 -122.86034 6.301 1.20 2 1.42 0A.1 tech 3D gE usgs GGF
72753595 2017/01/18 05:02:12.380 38.80065 -122.76872 1.797 0.90 2 0.88 0A.1 tech 3D gE usgs GGF
72753590 2017/01/18 05:01:31.020 39.24970 -123.21420 4.290 0.00 - - 0A.0 tech 3D gE usgs
72753585 2017/01/18 04:45:41.290 38.35830 -122.39330 1.880 1.10 - - 0A.0 tech 3D gE usgs
72753580 2017/01/18 04:41:36.530 37.47916 -118.78541 7.010 2.60 1 2.75 1A.1 tech 3D gE usgs LVC
72753575 2017/01/18 04:33:13.610 38.77813 -122.75677 1.729 0.50 1 0.77 0A.1 tech 3D gE usgs GGF
72753560 2017/01/18 04:07:31.490 37.47867 -118.78506 7.125 2.40 1 2.76 1A.1 tech 3D gE usgs LVC
72753540 2017/01/18 03:27:20.990 37.47425 -118.78460 6.965 2.30 1 2.27 1A.1 tech 3D gE usgs LVC
72753535 2017/01/18 03:22:6.640 37.47979 -118.78474 7.189 2.50 1 3.03 3A.1 tech 3D gE usgs LVC
72753530 2017/01/18 03:10:55.620 37.47856 -118.78368 7.339 2.70 1 3.07 1A.1 tech 3D gE usgs LVC
72753515 2017/01/18 02:53:36.380 37.48013 -118.78171 7.609 3.10 1 2.75 3A.1 tech 3D gE usgs LVC
72753510 2017/01/18 02:50:8.350 38.79196 -122.76547 3.135 0.50 1 2.24 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72753665 2017/01/18 07:42:1.480 37.52139 -118.84452 13.512 1.40 1 7.08 0A.1 tech 3D gE usgs LVC
72753660 2017/01/18 07:29:48.900 38.78581 -122.73497 2.204 1.60 2 0.58 0A.1 tech 3D gE usgs GGF
72753655 2017/01/18 07:29:43.850 38.78531 -122.73424 2.225 1.90 2 0.57 0A.1 tech 3D gE usgs GGF
72753650 2017/01/18 07:16:17.350 35.86330 -120.42620 5.100 0.00 - - 0A.0 tech 3D gE usgs
72753630 2017/01/18 06:00:42.110 38.84030 -122.83178 1.967 0.70 1 0.60 0A.1 tech 3D gE usgs GGF
72753625 2017/01/18 05:59:51.160 38.84031 -122.83007 1.998 0.90 2 0.97 0A.1 tech 3D gE usgs GGF
72753620 2017/01/18 05:59:41.750 38.83915 -122.83273 2.071 0.80 2 0.59 0A.1 tech 3D gE usgs GGF
72753615 2017/01/18 05:59:36.160 38.85011 -122.83162 0.520 1.60 2 1.37 0A.1 tech 3D gE usgs GGF
72749850 2017/01/08 10:22:9.260 38.79573 -122.76616 2.263 0.70 2 0.86 2F.1 tech 3D gE usgs GGF
72753605 2017/01/18 05:16:30.350 38.75024 -122.86034 6.301 1.20 2 1.42 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.