REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Thu Apr 27 15:12:54 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
2017: 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: 1
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
72794781 2017/04/27 15:01:9.020 37.62884 -118.85454 9.621 0.70 2 2.24 0A.1 tech 3D gE usgs LVC
72794776 2017/04/27 14:59:47.960 35.52557 -120.78490 5.949 1.80 1 0.52 1A.1 tech 3D gE usgs
72794756 2017/04/27 12:22:50.670 36.24428 -120.80370 6.457 1.50 1 0.37 0A.1 tech 3D gE usgs
72794751 2017/04/27 12:22:50.440 37.62734 -118.85253 9.986 1.80 2 2.32 1A.1 tech 3D gE usgs LVC
72794746 2017/04/27 12:17:1.890 38.84015 -122.82725 2.488 1.10 2 0.95 0A.1 tech 3D gE usgs GGF
72794731 2017/04/27 12:01:22.090 37.50891 -118.62696 0.002 1.00 2 0.27 0A.1 tech 3D gE usgs LVC
72794726 2017/04/27 11:28:54.530 37.62584 -118.84935 9.513 1.10 1 4.16 0A.1 tech 3D gE usgs LVC
72794721 2017/04/27 09:51:27.450 38.88086 -122.83096 0.123 0.90 2 0.32 0A.1 tech 3D gE usgs GGF
72794691 2017/04/27 08:57:3.530 38.82820 -122.80555 2.758 0.60 2 0.80 0A.1 tech 3D gE usgs GGF
72794686 2017/04/27 08:40:41.760 37.89138 -122.16322 8.452 0.90 1 0.77 0A.1 tech 3D gE usgs
72794671 2017/04/27 08:21:16.830 38.78838 -122.74375 1.522 1.30 2 1.17 0A.1 tech 3D gE usgs GGF
72794666 2017/04/27 08:17:37.700 38.78820 -122.74409 2.037 0.50 2 0.92 0A.1 tech 3D gE usgs GGF
72794641 2017/04/27 07:46:18.420 37.62687 -118.85219 10.023 1.40 2 2.38 0A.1 tech 3D gE usgs LVC
72794626 2017/04/27 07:37:46.880 40.06350 -122.18120 27.000 1.60 - - 0A.0 tech 3D gE usgs
72794591 2017/04/27 07:16:44.680 38.78824 -122.86958 3.674 1.30 2 2.60 0A.1 tech 3D gE usgs GGF
72794561 2017/04/27 06:45:10.960 40.32700 -122.37630 0.830 1.30 - - 0A.0 tech 3D gE usgs
72794556 2017/04/27 06:43:58.330 40.26480 -122.37930 3.550 1.50 - - 0A.0 tech 3D gE usgs
72794551 2017/04/27 06:39:23.620 37.62741 -118.85282 10.123 2.30 1 2.51 1A.1 tech 3D gE usgs LVC
72794531 2017/04/27 06:10:33.870 37.62627 -118.85279 9.938 2.30 2 2.54 1A.1 tech 3D gE usgs LVC
72794526 2017/04/27 06:07:16.290 38.82948 -122.85952 2.406 0.60 2 1.13 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72794776 2017/04/27 14:59:47.960 35.52557 -120.78490 5.949 1.80 1 0.52 1A.1 tech 3D gE usgs
72794781 2017/04/27 15:01:9.020 37.62884 -118.85454 9.621 0.70 2 2.24 0A.1 tech 3D gE usgs LVC
72794751 2017/04/27 12:22:50.440 37.62734 -118.85253 9.986 1.80 2 2.32 1A.1 tech 3D gE usgs LVC
72794756 2017/04/27 12:22:50.670 36.24428 -120.80370 6.457 1.50 1 0.37 0A.1 tech 3D gE usgs
72794746 2017/04/27 12:17:1.890 38.84015 -122.82725 2.488 1.10 2 0.95 0A.1 tech 3D gE usgs GGF
72794731 2017/04/27 12:01:22.090 37.50891 -118.62696 0.002 1.00 2 0.27 0A.1 tech 3D gE usgs LVC
72794726 2017/04/27 11:28:54.530 37.62584 -118.84935 9.513 1.10 1 4.16 0A.1 tech 3D gE usgs LVC
72794721 2017/04/27 09:51:27.450 38.88086 -122.83096 0.123 0.90 2 0.32 0A.1 tech 3D gE usgs GGF
72794691 2017/04/27 08:57:3.530 38.82820 -122.80555 2.758 0.60 2 0.80 0A.1 tech 3D gE usgs GGF
72794686 2017/04/27 08:40:41.760 37.89138 -122.16322 8.452 0.90 1 0.77 0A.1 tech 3D gE usgs


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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.