REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Wed Aug 16 09:49:41 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: 1462
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
72866096 2017/08/10 23:36:23.300 37.51116 -118.79954 1.121 1.40 1 1.61 0A.1 tech 3D gE usgs LVC
72866091 2017/08/10 23:24:13.990 36.57625 -121.18057 6.804 0.40 2 0.39 0A.1 tech 3D gE usgs
72866081 2017/08/10 23:20:47.420 38.89844 -122.87235 1.276 1.70 2 1.29 0A.1 tech 3D gE usgs GGF
72866076 2017/08/10 23:15:23.350 37.54208 -118.81846 1.970 2.00 1 0.82 0A.1 tech 3D gE usgs LVC
72866071 2017/08/10 23:12:56.860 38.82465 -122.80042 4.071 1.20 1 1.41 1A.1 tech 3D gE usgs GGF
72866066 2017/08/10 23:06:52.850 37.54152 -118.81860 1.878 1.90 2 1.09 0A.1 tech 3D gE usgs LVC
72866061 2017/08/10 22:59:7.290 35.66336 -121.11498 5.099 1.50 2 0.81 0A.1 tech 3D gE usgs
72866056 2017/08/10 22:56:23.960 39.26180 -123.20600 3.940 0.00 - - 0A.0 tech 3D gE usgs
72866046 2017/08/10 22:51:9.190 36.59349 -121.20635 8.466 1.20 1 0.48 0A.1 tech 3D gE usgs
72866021 2017/08/10 22:20:51.160 38.76382 -122.74248 1.911 0.50 1 1.53 0A.1 tech 3D gE usgs GGF
72866006 2017/08/10 21:38:53.420 36.05832 -120.61105 9.924 1.10 2 2.65 0A.1 tech 3D gE usgs PKF
72866001 2017/08/10 21:22:37.610 38.80523 -122.79225 2.618 1.10 2 1.18 0A.1 tech 3D gE usgs GGF
72865971 2017/08/10 19:56:15.670 37.56780 -118.86148 0.295 0.80 2 0.72 0A.1 tech 3D gE usgs LVC
72865966 2017/08/10 19:54:17.150 39.02480 -122.79470 1.390 1.10 - - 0A.0 tech 3D gE usgs
72865961 2017/08/10 19:54:11.410 38.80853 -122.76996 1.661 1.00 2 0.93 0A.1 tech 3D gE usgs GGF
72865956 2017/08/10 19:49:43.800 38.78569 -122.75392 2.654 1.70 1 1.26 1A.1 tech 3D gE usgs GGF
72865951 2017/08/10 19:24:28.340 35.70793 -121.07417 6.188 1.60 1 0.86 0A.1 tech 3D gE usgs
72865946 2017/08/10 19:22:54.930 38.73977 -122.72767 2.862 0.50 2 0.92 0A.1 tech 3D gE usgs GGF
72865936 2017/08/10 19:05:7.180 37.60500 -118.94020 0.320 0.70 - - 0A.0 tech 3D gE usgs LVC
72865906 2017/08/10 18:20:40.950 36.89268 -121.61041 1.612 2.30 1 0.41 0A.1 tech 3D gE usgs

Events last re/processed:
72866096 2017/08/10 23:36:23.300 37.51116 -118.79954 1.121 1.40 1 1.61 0A.1 tech 3D gE usgs LVC
72861301 2017/08/05 22:23:3.220 37.56238 -118.92572 0.958 0.40 2 1.92 2F.1 tech 3D gE usgs LVC
72866091 2017/08/10 23:24:13.990 36.57625 -121.18057 6.804 0.40 2 0.39 0A.1 tech 3D gE usgs
72866081 2017/08/10 23:20:47.420 38.89844 -122.87235 1.276 1.70 2 1.29 0A.1 tech 3D gE usgs GGF
72861196 2017/08/05 20:12:46.500 37.04399 -118.31215 4.953 1.30 1 0.62 2F.1 tech 3D gE usgs
72866076 2017/08/10 23:15:23.350 37.54208 -118.81846 1.970 2.00 1 0.82 0A.1 tech 3D gE usgs LVC
72866071 2017/08/10 23:12:56.860 38.82465 -122.80042 4.071 1.20 1 1.41 1A.1 tech 3D gE usgs GGF
72866066 2017/08/10 23:06:52.850 37.54152 -118.81860 1.878 1.90 2 1.09 0A.1 tech 3D gE usgs LVC
72861056 2017/08/05 17:18:16.620 37.58770 -118.94000 0.780 0.50 - - 2F.0 tech 3D gE usgs LVC
72866061 2017/08/10 22:59:7.290 35.66336 -121.11498 5.099 1.50 2 0.81 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.