REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Tue May 30 17:37:43 UTC 2023    [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:
2022-10-25 M5.0 Calaveras
2021-07-08 M6.0 SmithValley
2020-08-19 M4.0 Willits
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
2020: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2021: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2022: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2023: 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: 4
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
73891675 2023/05/30 17:22:29.180 38.82563 -122.79623 4.063 0.80 1 1.30 0A.1 tech 3D gE usgs GGF
73891670 2023/05/30 17:12:2.850 37.43414 -118.53761 4.792 1.60 2 0.49 0A.1 tech 3D gE usgs LVC
73891665 2023/05/30 17:07:1.250 38.83899 -122.83369 17.797 1.10 2 0.08 0A.1 tech 3D gE usgs GGF
73891660 2023/05/30 17:06:52.040 38.83136 -122.80337 0.146 1.20 2 1.70 0A.1 tech 3D gE usgs GGF
73891655 2023/05/30 16:03:30.270 37.39670 -119.99400 19.730 1.60 - - 3F.0 tech 3D gE usgs
73891650 2023/05/30 15:48:54.120 38.85488 -122.81620 2.487 0.60 1 0.90 0A.1 tech 3D gE usgs GGF
73891645 2023/05/30 15:40:21.730 38.79276 -122.76817 3.382 0.70 1 1.54 0A.1 tech 3D gE usgs GGF
73891640 2023/05/30 15:34:2.580 38.81054 -122.78472 2.272 0.80 1 1.12 0A.1 tech 3D gE usgs GGF
73891625 2023/05/30 13:56:33.260 38.78667 -122.74633 2.028 0.80 2 0.63 0A.1 tech 3D gE usgs GGF
73891620 2023/05/30 13:32:58.300 38.81438 -122.82498 3.081 1.70 1 1.18 0A.1 tech 3D gE usgs GGF
73891615 2023/05/30 12:44:25.390 40.40480 -124.20850 16.790 2.10 - - 0A.0 tech 3D gE usgs MTJ
73891610 2023/05/30 12:37:41.900 38.83861 -122.83741 2.431 0.80 2 0.78 0A.1 tech 3D gE usgs GGF
73891605 2023/05/30 11:00:18.770 40.38480 -125.03120 0.690 3.10 - - 2A.0 tech 3D gE usgs MTJ
73891600 2023/05/30 10:21:59.280 38.82099 -122.80754 3.607 0.50 1 0.63 0A.1 tech 3D gE usgs GGF
73891590 2023/05/30 09:55:31.090 38.46622 -122.66165 3.910 1.40 2 0.51 0A.1 tech 3D gE usgs
73891585 2023/05/30 08:52:32.010 38.78881 -122.75925 2.845 1.10 1 0.98 0A.1 tech 3D gE usgs GGF
73891575 2023/05/30 08:31:38.260 37.29380 -117.57280 -1.320 3.20 - - 2A.0 tech 3D gE usgs
73891570 2023/05/30 08:22:39.160 38.82218 -122.82156 3.337 0.80 1 0.97 0A.1 tech 3D gE usgs GGF
73891565 2023/05/30 07:58:10.460 38.75735 -122.73831 2.339 1.50 1 0.92 0A.1 tech 3D gE usgs GGF
73891560 2023/05/30 06:38:20.640 38.80373 -122.81694 1.579 0.40 1 1.60 0A.1 tech 3D gE usgs GGF

Events last re/processed:
73891675 2023/05/30 17:22:29.180 38.82563 -122.79623 4.063 0.80 1 1.30 0A.1 tech 3D gE usgs GGF
73890460 2023/05/27 01:56:58.490 37.38643 -118.44888 10.947 1.40 1 1.17 3F.1 tech 3D gE usgs
73890400 2023/05/27 00:14:26.960 40.24133 -121.14359 6.495 2.60 2 0.16 3F.1 tech 3D gE usgs
73891670 2023/05/30 17:12:2.850 37.43414 -118.53761 4.792 1.60 2 0.49 0A.1 tech 3D gE usgs LVC
73891665 2023/05/30 17:07:1.250 38.83899 -122.83369 17.797 1.10 2 0.08 0A.1 tech 3D gE usgs GGF
73891660 2023/05/30 17:06:52.040 38.83136 -122.80337 0.146 1.20 2 1.70 0A.1 tech 3D gE usgs GGF
73891655 2023/05/30 16:03:30.270 37.39670 -119.99400 19.730 1.60 - - 3F.0 tech 3D gE usgs
73890405 2023/05/27 00:21:47.080 38.82113 -122.82336 2.999 1.30 1 0.86 4F.1 tech 3D gE usgs GGF
73890395 2023/05/27 00:14:29.170 38.82378 -122.80529 3.971 0.40 1 0.96 2F.1 tech 3D gE usgs GGF
73891650 2023/05/30 15:48:54.120 38.85488 -122.81620 2.487 0.60 1 0.90 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.