REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sat Aug 27 15:37:49 UTC 2016    [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

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
72686056 2016/08/27 15:24:3.570 38.78914 -122.74948 0.897 1.40 2 0.92 0A.1 tech 3D gE usgs GGF
72686066 2016/08/27 15:24:20.800 37.63978 -118.92100 7.223 0.60 2 3.11 0A.1 tech 3D gE usgs LVC
72686061 2016/08/27 15:24:20.650 38.78961 -122.75006 1.001 1.30 1 0.91 0A.1 tech 3D gE usgs GGF
72686051 2016/08/27 15:22:34.560 37.64111 -118.91774 7.139 1.10 1 6.37 0A.1 tech 3D gE usgs LVC
72686046 2016/08/27 15:19:57.140 37.63630 -118.92491 8.699 0.90 1 3.64 0A.1 tech 3D gE usgs LVC
72686041 2016/08/27 15:11:57.830 37.63914 -118.92359 7.597 0.70 1 3.13 0A.1 tech 3D gE usgs LVC
72686036 2016/08/27 15:02:45.610 37.63850 -118.92630 5.470 0.70 - - 0A.0 tech 3D gE usgs LVC
72686031 2016/08/27 15:00:9.620 37.63712 -118.92535 8.207 0.90 2 3.75 0A.1 tech 3D gE usgs LVC
72686026 2016/08/27 15:00:5.580 35.50807 -120.75466 3.954 2.20 1 0.40 1A.1 tech 3D gE usgs
72686016 2016/08/27 14:56:44.080 37.63920 -118.92265 7.634 1.10 1 3.67 0A.1 tech 3D gE usgs LVC
72686011 2016/08/27 14:54:28.650 39.15150 -123.23050 5.090 1.10 - - 0A.0 tech 3D gE usgs
72686006 2016/08/27 14:54:16.090 38.82989 -122.76498 5.772 0.10 2 0.57 0A.1 tech 3D gE usgs GGF
72685996 2016/08/27 14:18:13.350 37.63170 -118.89470 -0.600 0.50 - - 0A.0 tech 3D gE usgs LVC
72685986 2016/08/27 14:16:31.980 37.63461 -118.90750 5.767 0.60 1 2.71 0A.1 tech 3D gE usgs LVC
72685981 2016/08/27 14:15:55.900 36.69987 -121.34150 3.923 1.20 2 0.87 0A.1 tech 3D gE usgs
72685976 2016/08/27 14:14:34.350 38.82458 -122.77607 2.747 0.40 2 1.09 0A.1 tech 3D gE usgs GGF
72685966 2016/08/27 13:57:32.210 37.64320 -118.88554 1.581 1.30 2 1.60 0A.1 tech 3D gE usgs LVC
72685961 2016/08/27 13:52:8.220 38.78822 -122.92914 6.653 0.60 2 0.24 0A.1 tech 3D gE usgs
72685956 2016/08/27 13:45:43.750 40.31245 -124.42878 18.955 3.20 2 2.35 2A.1 tech 3D gE usgs MTJ
72685946 2016/08/27 13:19:43.030 39.73070 -123.17770 4.880 0.00 - - 0A.0 tech 3D gE usgs

Events last re/processed:
72686066 2016/08/27 15:24:20.800 37.63978 -118.92100 7.223 0.60 2 3.11 0A.1 tech 3D gE usgs LVC
72686061 2016/08/27 15:24:20.650 38.78961 -122.75006 1.001 1.30 1 0.91 0A.1 tech 3D gE usgs GGF
72686056 2016/08/27 15:24:3.570 38.78914 -122.74948 0.897 1.40 2 0.92 0A.1 tech 3D gE usgs GGF
72686051 2016/08/27 15:22:34.560 37.64111 -118.91774 7.139 1.10 1 6.37 0A.1 tech 3D gE usgs LVC
72686046 2016/08/27 15:19:57.140 37.63630 -118.92491 8.699 0.90 1 3.64 0A.1 tech 3D gE usgs LVC
72686041 2016/08/27 15:11:57.830 37.63914 -118.92359 7.597 0.70 1 3.13 0A.1 tech 3D gE usgs LVC
72686036 2016/08/27 15:02:45.610 37.63850 -118.92630 5.470 0.70 - - 0A.0 tech 3D gE usgs LVC
72686031 2016/08/27 15:00:9.620 37.63712 -118.92535 8.207 0.90 2 3.75 0A.1 tech 3D gE usgs LVC
72686026 2016/08/27 15:00:5.580 35.50807 -120.75466 3.954 2.20 1 0.40 1A.1 tech 3D gE usgs
72686016 2016/08/27 14:56:44.080 37.63920 -118.92265 7.634 1.10 1 3.67 0A.1 tech 3D gE usgs LVC


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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.