REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sat Feb 16 21:53:24 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: 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
73143016 2019/02/16 19:04:23.750 39.98659 -121.23716 0.007 3.10 2 0.96 2A.1 tech 3D gE usgs
73143011 2019/02/16 16:46:19.180 38.81576 -122.81027 4.048 1.30 2 1.47 0A.1 tech 3D gE usgs GGF
73143006 2019/02/16 16:38:47.660 38.77703 -122.75493 1.201 1.00 1 0.82 0A.1 tech 3D gE usgs GGF
73142996 2019/02/16 14:09:2.730 38.77559 -122.71395 1.858 0.60 2 0.76 0A.1 tech 3D gE usgs GGF
73142991 2019/02/16 13:59:14.960 37.30929 -121.68336 6.272 1.60 1 0.85 0A.1 tech 3D gE usgs CAL
73142986 2019/02/16 13:58:2.780 38.82196 -122.78745 2.056 0.70 1 0.52 0A.1 tech 3D gE usgs GGF
73142976 2019/02/16 13:28:54.350 38.83177 -122.79278 2.423 1.60 1 1.04 0A.1 tech 3D gE usgs GGF
73142971 2019/02/16 13:24:6.260 38.79124 -122.75731 1.946 1.60 2 0.94 0A.1 tech 3D gE usgs GGF
73142966 2019/02/16 12:33:11.690 36.67751 -121.30346 3.865 1.90 1 0.54 0A.1 tech 3D gE usgs
73142961 2019/02/16 12:28:1.120 38.78608 -122.76263 2.783 0.90 2 0.82 0A.1 tech 3D gE usgs GGF
73142956 2019/02/16 12:12:22.360 38.77824 -122.71829 3.961 0.00 1 0.53 0A.1 tech 3D gE usgs GGF
73142951 2019/02/16 12:05:17.210 36.67672 -121.30274 4.399 2.20 1 1.28 0A.1 tech 3D gE usgs
73142946 2019/02/16 10:43:18.790 38.81833 -122.75821 2.265 0.50 2 0.79 0A.1 tech 3D gE usgs GGF
73142941 2019/02/16 10:25:2.630 37.04290 -121.14150 8.518 2.70 1 1.75 0A.1 tech 3D gE usgs
73142936 2019/02/16 10:13:35.850 36.00490 -120.56316 4.464 1.10 1 1.54 0A.1 tech 3D gE usgs PKF
73142931 2019/02/16 09:33:49.840 38.81054 -122.73905 2.918 0.60 2 0.85 0A.1 tech 3D gE usgs GGF
73142926 2019/02/16 09:26:5.820 39.21692 -123.11677 0.037 2.70 2 0.91 0A.1 tech 3D gE usgs
73142921 2019/02/16 09:21:40.970 38.90010 -122.71447 10.072 0.60 2 0.36 0A.1 tech 3D gE usgs GGF
73142916 2019/02/16 09:15:20.580 37.04753 -121.50307 7.584 1.60 1 1.00 0A.1 tech 3D gE usgs
73142911 2019/02/16 08:48:32.870 38.77949 -122.71758 2.449 2.20 2 0.91 0A.1 tech 3D gE usgs GGF

Events last re/processed:
73143016 2019/02/16 19:04:23.750 39.98659 -121.23716 0.007 3.10 2 0.96 2A.1 tech 3D gE usgs
73143011 2019/02/16 16:46:19.180 38.81576 -122.81027 4.048 1.30 2 1.47 0A.1 tech 3D gE usgs GGF
73143006 2019/02/16 16:38:47.660 38.77703 -122.75493 1.201 1.00 1 0.82 0A.1 tech 3D gE usgs GGF
73142996 2019/02/16 14:09:2.730 38.77559 -122.71395 1.858 0.60 2 0.76 0A.1 tech 3D gE usgs GGF
73142991 2019/02/16 13:59:14.960 37.30929 -121.68336 6.272 1.60 1 0.85 0A.1 tech 3D gE usgs CAL
73142986 2019/02/16 13:58:2.780 38.82196 -122.78745 2.056 0.70 1 0.52 0A.1 tech 3D gE usgs GGF
73142976 2019/02/16 13:28:54.350 38.83177 -122.79278 2.423 1.60 1 1.04 0A.1 tech 3D gE usgs GGF
73142971 2019/02/16 13:24:6.260 38.79124 -122.75731 1.946 1.60 2 0.94 0A.1 tech 3D gE usgs GGF
73142966 2019/02/16 12:33:11.690 36.67751 -121.30346 3.865 1.90 1 0.54 0A.1 tech 3D gE usgs
73142961 2019/02/16 12:28:1.120 38.78608 -122.76263 2.783 0.90 2 0.82 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.