REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Thu Apr 25 00:14:13 UTC 2019    [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
2018: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2019: 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: 3
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
73171475 2019/04/25 00:02:42.580 36.47773 -121.05974 5.748 1.80 1 0.56 0A.1 tech 3D gE usgs
73171470 2019/04/25 00:00:41.950 38.83180 -122.79060 2.437 0.60 2 0.98 0A.1 tech 3D gE usgs GGF
73171465 2019/04/24 23:53:34.250 38.83595 -122.80107 2.952 1.40 2 0.73 0A.1 tech 3D gE usgs GGF
73171460 2019/04/24 23:42:45.850 38.78986 -122.73689 2.456 1.00 1 0.97 0A.1 tech 3D gE usgs GGF
73171450 2019/04/24 23:21:0.850 38.79313 -122.76082 1.751 0.50 2 1.48 0A.1 tech 3D gE usgs GGF
73171445 2019/04/24 23:17:17.660 36.73365 -121.40539 5.773 0.90 1 0.43 0A.1 tech 3D gE usgs
73171440 2019/04/24 23:09:8.580 38.83622 -122.80172 2.824 0.90 2 0.71 0A.1 tech 3D gE usgs GGF
73171430 2019/04/24 22:11:58.480 38.78722 -122.72915 1.511 0.50 2 0.56 0A.1 tech 3D gE usgs GGF
73171425 2019/04/24 22:00:3.140 38.80843 -122.73877 2.870 1.00 2 0.92 0A.1 tech 3D gE usgs GGF
73171420 2019/04/24 21:27:41.330 36.94500 -121.56770 4.090 1.40 - - 0A.0 tech 3D gE usgs
73171410 2019/04/24 21:25:37.830 38.82185 -122.81931 8.141 0.00 2 1.33 0A.1 tech 3D gE usgs GGF
73171415 2019/04/24 21:25:36.230 37.14857 -117.91979 0.002 1.80 2 0.27 0A.1 tech 3D gE usgs
73171405 2019/04/24 21:14:30.960 38.84015 -122.82791 2.509 0.60 1 0.47 0A.1 tech 3D gE usgs GGF
73171400 2019/04/24 21:07:5.140 38.81497 -122.82109 3.137 0.90 1 1.04 0A.1 tech 3D gE usgs GGF
73171395 2019/04/24 20:54:53.880 37.49459 -122.41887 4.431 1.40 2 0.88 0A.1 tech 3D gE usgs
73171390 2019/04/24 20:49:2.970 40.41720 -124.75930 24.610 2.40 - - 0A.0 tech 3D gE usgs MTJ
73171380 2019/04/24 20:22:58.320 38.83678 -122.80242 2.991 0.80 2 0.86 0A.1 tech 3D gE usgs GGF
73171375 2019/04/24 19:56:42.890 38.84397 -122.84131 2.691 0.90 2 0.98 0A.1 tech 3D gE usgs GGF
73171370 2019/04/24 19:37:3.870 38.94220 -122.68380 1.990 1.10 - - 0A.0 tech 3D gE usgs
73171365 2019/04/24 19:20:56.700 36.46226 -121.04849 5.759 1.70 1 0.60 0A.1 tech 3D gE usgs

Events last re/processed:
73171475 2019/04/25 00:02:42.580 36.47773 -121.05974 5.748 1.80 1 0.56 0A.1 tech 3D gE usgs
73171470 2019/04/25 00:00:41.950 38.83180 -122.79060 2.437 0.60 2 0.98 0A.1 tech 3D gE usgs GGF
73171465 2019/04/24 23:53:34.250 38.83595 -122.80107 2.952 1.40 2 0.73 0A.1 tech 3D gE usgs GGF
73170065 2019/04/22 03:48:39.470 38.81607 -122.80128 3.338 1.30 1 0.65 2F.1 tech 3D gE usgs GGF
73171460 2019/04/24 23:42:45.850 38.78986 -122.73689 2.456 1.00 1 0.97 0A.1 tech 3D gE usgs GGF
73170055 2019/04/22 03:32:47.760 38.82953 -122.80072 3.706 1.30 1 1.17 2F.1 tech 3D gE usgs GGF
73171450 2019/04/24 23:21:0.850 38.79313 -122.76082 1.751 0.50 2 1.48 0A.1 tech 3D gE usgs GGF
73171445 2019/04/24 23:17:17.660 36.73365 -121.40539 5.773 0.90 1 0.43 0A.1 tech 3D gE usgs
73170040 2019/04/22 01:04:5.150 38.81871 -122.81401 3.781 1.40 2 0.72 2F.1 tech 3D gE usgs GGF
73171440 2019/04/24 23:09:8.580 38.83622 -122.80172 2.824 0.90 2 0.71 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.