REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Fri Apr 29 21:36:52 UTC 2016    [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: 2
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
72628740 2016/04/29 21:26:11.090 38.79744 -122.81290 4.074 0.50 1 0.69 0A.1 tech 3D gE usgs GGF
72628730 2016/04/29 21:19:34.230 37.72932 -122.12515 3.990 2.90 1 0.82 1A.1 tech 3D gE usgs HAY
72628725 2016/04/29 21:05:4.960 38.84756 -122.84764 0.515 1.10 2 4.08 0A.1 tech 3D gE usgs GGF
72628720 2016/04/29 20:47:57.420 38.83156 -122.80908 2.683 1.00 2 0.56 0A.1 tech 3D gE usgs GGF
72628715 2016/04/29 20:41:16.970 38.82046 -122.75648 5.016 0.60 1 0.63 0A.1 tech 3D gE usgs GGF
72628710 2016/04/29 20:37:26.940 38.81403 -122.82131 4.071 2.10 2 1.54 1A.1 tech 3D gE usgs GGF
72628705 2016/04/29 20:19:53.160 38.87383 -122.81973 2.959 1.40 2 0.46 1A.1 tech 3D gE usgs GGF
72628695 2016/04/29 20:03:12.940 38.79500 -122.75662 2.950 1.50 2 1.39 1A.1 tech 3D gE usgs GGF
72628690 2016/04/29 19:59:36.890 38.81570 -122.78143 2.827 0.50 1 0.99 0A.1 tech 3D gE usgs GGF
72628685 2016/04/29 19:50:40.420 38.78585 -122.72609 2.255 1.00 2 0.63 2F.1 tech 3D gE usgs GGF
72628680 2016/04/29 19:38:29.820 37.99285 -121.79099 4.737 1.00 2 0.39 0A.1 tech 3D gE usgs
72628665 2016/04/29 18:43:29.660 37.93250 -121.80766 11.563 2.80 2 3.40 1A.1 tech 3D gE usgs
72628660 2016/04/29 18:34:34.500 38.79419 -122.76444 3.558 0.50 1 1.31 0A.1 tech 3D gE usgs GGF
72628655 2016/04/29 18:31:33.190 38.81772 -122.82107 3.224 0.60 2 0.87 0A.1 tech 3D gE usgs GGF
72628615 2016/04/29 17:00:47.760 38.81348 -122.82873 3.414 1.00 2 1.10 0A.1 tech 3D gE usgs GGF
72628610 2016/04/29 16:51:13.060 38.81286 -122.83018 3.308 0.60 1 0.74 7F.1 tech 3D gE usgs GGF
72628605 2016/04/29 16:50:10.620 38.81329 -122.83005 3.529 1.30 1 1.07 4F.1 tech 3D gE usgs GGF
72628600 2016/04/29 16:38:26.020 38.80017 -122.80996 2.964 0.90 1 0.89 0A.1 tech 3D gE usgs GGF
72628585 2016/04/29 15:56:4.900 38.80419 -122.79638 4.603 0.90 2 1.47 0A.1 tech 3D gE usgs GGF
72628575 2016/04/29 15:51:57.930 39.02580 -122.58595 4.703 2.10 1 2.59 4F.1 tech 3D gE usgs

Events last re/processed:
72628740 2016/04/29 21:26:11.090 38.79744 -122.81290 4.074 0.50 1 0.69 0A.1 tech 3D gE usgs GGF
72213691 2014/05/01 12:41:36.970 38.80673 -122.82327 2.945 1.30 1 1.14 3F.1 tech 3D gE usgs GGF
72628730 2016/04/29 21:19:34.230 37.72932 -122.12515 3.990 2.90 1 0.82 1A.1 tech 3D gE usgs HAY
72628685 2016/04/29 19:50:40.420 38.78585 -122.72609 2.255 1.00 2 0.63 2F.1 tech 3D gE usgs GGF
72213591 2014/05/01 09:17:18.900 38.81328 -122.82082 3.356 0.30 1 0.91 2F.1 tech 3D gE usgs GGF
72213561 2014/05/01 08:46:50.020 38.77515 -122.75565 0.954 0.20 1 0.96 2F.1 tech 3D gE usgs GGF
72628725 2016/04/29 21:05:4.960 38.84756 -122.84764 0.515 1.10 2 4.08 0A.1 tech 3D gE usgs GGF
72628720 2016/04/29 20:47:57.420 38.83156 -122.80908 2.683 1.00 2 0.56 0A.1 tech 3D gE usgs GGF
72628715 2016/04/29 20:41:16.970 38.82046 -122.75648 5.016 0.60 1 0.63 0A.1 tech 3D gE usgs GGF
72628710 2016/04/29 20:37:26.940 38.81403 -122.82131 4.071 2.10 2 1.54 1A.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.