REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Thu May 28 15:41:50 UTC 2015    [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
2015: 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
72456686 2015/05/28 08:42:32.490 38.82649 -122.89966 3.906 0.90 1 0.26 0A.1 tech 3D gE usgs GGF
72456681 2015/05/28 08:11:18.800 37.65500 -118.82670 2.500 0.70 - - 0A.0 tech 3D gE usgs LVC
72456676 2015/05/28 08:02:42.990 38.82374 -122.77990 1.657 0.50 1 0.33 0A.1 tech 3D gE usgs GGF
72456671 2015/05/28 07:52:44.000 38.03600 -122.65570 4.980 0.00 - - 0A.0 tech 3D gE usgs
72456661 2015/05/28 07:44:27.120 37.40823 -121.75653 7.906 1.00 2 0.93 0A.1 tech 3D gE usgs CAL
72456656 2015/05/28 07:38:17.990 38.78407 -122.73426 2.288 0.80 2 0.25 0A.1 tech 3D gE usgs GGF
72456651 2015/05/28 07:30:2.960 38.65023 -122.48852 4.775 0.00 2 0.04 0A.1 tech 3D gE usgs
72456646 2015/05/28 07:23:3.300 38.76042 -122.71357 2.389 2.30 2 0.33 1A.1 tech 3D gE usgs GGF
72456641 2015/05/28 05:37:22.810 38.78569 -122.75221 0.929 0.30 1 0.27 0A.1 tech 3D gE usgs GGF
72456636 2015/05/28 04:47:59.890 38.80867 -122.79975 2.607 1.40 1 0.63 1A.1 tech 3D gE usgs GGF
72456631 2015/05/28 04:23:13.870 35.71333 -119.90291 2.089 2.00 2 0.68 0A.1 tech 3D gE usgs
72456626 2015/05/28 04:08:27.140 38.79056 -122.73980 1.687 0.40 2 0.44 0A.1 tech 3D gE usgs GGF
72456621 2015/05/28 04:04:52.280 38.80253 -122.79041 3.711 0.50 1 0.52 0A.1 tech 3D gE usgs GGF
72456616 2015/05/28 04:03:49.920 36.38664 -120.96602 5.572 2.50 1 0.49 1A.1 tech 3D gE usgs
72456611 2015/05/28 03:52:28.670 38.82591 -122.76536 3.155 0.90 1 0.47 0A.1 tech 3D gE usgs GGF
72456606 2015/05/28 03:46:52.060 37.64992 -118.81656 2.869 0.90 1 0.26 0A.1 tech 3D gE usgs LVC
72456596 2015/05/28 02:11:52.100 38.43870 -123.09950 5.020 0.00 - - 0A.0 tech 3D gE usgs
72456591 2015/05/28 01:54:47.370 39.67202 -121.10842 4.790 2.50 1 1.40 0A.1 tech 3D gE usgs
72456581 2015/05/28 01:37:23.310 38.77540 -122.72336 1.897 0.40 2 0.42 0A.1 tech 3D gE usgs GGF
72456576 2015/05/28 01:37:1.890 38.77662 -122.72571 2.098 1.60 2 1.10 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72456686 2015/05/28 08:42:32.490 38.82649 -122.89966 3.906 0.90 1 0.26 0A.1 tech 3D gE usgs GGF
72456681 2015/05/28 08:11:18.800 37.65500 -118.82670 2.500 0.70 - - 0A.0 tech 3D gE usgs LVC
72456676 2015/05/28 08:02:42.990 38.82374 -122.77990 1.657 0.50 1 0.33 0A.1 tech 3D gE usgs GGF
72456671 2015/05/28 07:52:44.000 38.03600 -122.65570 4.980 0.00 - - 0A.0 tech 3D gE usgs
72456661 2015/05/28 07:44:27.120 37.40823 -121.75653 7.906 1.00 2 0.93 0A.1 tech 3D gE usgs CAL
72456656 2015/05/28 07:38:17.990 38.78407 -122.73426 2.288 0.80 2 0.25 0A.1 tech 3D gE usgs GGF
72456651 2015/05/28 07:30:2.960 38.65023 -122.48852 4.775 0.00 2 0.04 0A.1 tech 3D gE usgs
72456646 2015/05/28 07:23:3.300 38.76042 -122.71357 2.389 2.30 2 0.33 1A.1 tech 3D gE usgs GGF
72454286 2015/05/23 19:01:53.130 36.36356 -120.03599 19.090 2.20 2 0.41 6F.1 tech 3D gE usgs
72456641 2015/05/28 05:37:22.810 38.78569 -122.75221 0.929 0.30 1 0.27 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.