REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Thu Nov 27 06:21:41 UTC 2014    [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

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
72356576 2014/11/27 05:51:35.220 38.18112 -122.27422 9.892 1.50 2 1.45 0A.1 tech 3D gE usgs
72356566 2014/11/27 05:35:24.840 38.80809 -122.82691 2.281 0.60 1 0.32 0A.1 tech 3D gE usgs GGF
72356551 2014/11/27 05:15:54.480 37.66609 -118.86924 4.689 1.20 1 0.54 0A.1 tech 3D gE usgs LVC
72356541 2014/11/27 05:10:35.370 38.81016 -122.81471 3.021 1.60 1 0.39 1A.1 tech 3D gE usgs GGF
72356536 2014/11/27 05:05:23.390 39.44263 -123.17908 0.710 0.00 2 0.03 0A.1 tech 3D gE usgs
72356521 2014/11/27 04:15:0.200 38.93650 -123.03570 8.440 0.00 - - 0A.0 tech 3D gE usgs
72356506 2014/11/27 03:40:6.730 37.62819 -118.87700 8.491 0.90 1 0.97 0A.1 tech 3D gE usgs LVC
72356501 2014/11/27 03:36:35.090 37.63077 -118.87481 8.364 1.30 1 0.47 0A.1 tech 3D gE usgs LVC
72356471 2014/11/27 02:59:37.030 40.28190 -124.32168 22.622 2.40 2 0.85 1A.1 tech 3D gE usgs MTJ
72356461 2014/11/27 02:52:7.610 37.62971 -118.87365 8.164 1.30 1 0.28 0A.1 tech 3D gE usgs LVC
72356456 2014/11/27 02:45:36.200 37.61930 -118.87130 9.030 0.80 - - 0A.0 tech 3D gE usgs LVC
72356446 2014/11/27 02:22:46.920 38.82152 -122.84549 2.778 0.90 1 0.47 1A.1 tech 3D gE usgs GGF
72356441 2014/11/27 02:17:13.550 38.95718 -122.86366 2.392 0.60 2 0.12 0A.1 tech 3D gE usgs
72356421 2014/11/27 01:17:28.510 38.82064 -122.84600 2.840 0.60 2 0.62 0A.1 tech 3D gE usgs GGF
72356401 2014/11/27 00:18:28.660 37.66760 -118.87101 4.424 0.80 2 0.54 0A.1 tech 3D gE usgs LVC
72356396 2014/11/27 00:09:3.620 38.79858 -122.80141 1.519 0.80 1 0.28 0A.1 tech 3D gE usgs GGF
72356391 2014/11/27 00:06:44.930 37.66016 -118.86906 4.765 1.20 1 0.71 0A.1 tech 3D gE usgs LVC
72356386 2014/11/26 23:48:45.250 38.84506 -122.82632 2.512 0.40 2 0.17 0A.1 tech 3D gE usgs GGF
72356381 2014/11/26 23:29:51.920 38.90700 -122.99965 2.886 1.40 2 0.68 0A.1 tech 3D gE usgs
72356371 2014/11/26 23:15:7.700 35.84670 -120.40850 2.190 0.00 - - 0A.0 tech 3D gE usgs

Events last re/processed:
72356576 2014/11/27 05:51:35.220 38.18112 -122.27422 9.892 1.50 2 1.45 0A.1 tech 3D gE usgs
72356566 2014/11/27 05:35:24.840 38.80809 -122.82691 2.281 0.60 1 0.32 0A.1 tech 3D gE usgs GGF
72356551 2014/11/27 05:15:54.480 37.66609 -118.86924 4.689 1.20 1 0.54 0A.1 tech 3D gE usgs LVC
72356541 2014/11/27 05:10:35.370 38.81016 -122.81471 3.021 1.60 1 0.39 1A.1 tech 3D gE usgs GGF
72356536 2014/11/27 05:05:23.390 39.44263 -123.17908 0.710 0.00 2 0.03 0A.1 tech 3D gE usgs
72348956 2014/11/17 22:48:14.180 37.66570 -118.87339 5.079 0.80 2 0.26 2F.1 tech 3D gE usgs LVC
72356521 2014/11/27 04:15:0.200 38.93650 -123.03570 8.440 0.00 - - 0A.0 tech 3D gE usgs
72348936 2014/11/17 22:25:16.790 37.98639 -122.05216 15.807 1.80 1 1.42 2F.1 tech 3D gE usgs
72348921 2014/11/17 22:01:25.780 37.64179 -118.94452 7.850 0.70 1 0.14 2F.1 tech 3D gE usgs LVC
72356506 2014/11/27 03:40:6.730 37.62819 -118.87700 8.491 0.90 1 0.97 0A.1 tech 3D gE usgs LVC


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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.