REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Tue Dec 6 19:43:43 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: 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
72733880 2016/12/06 19:06:51.760 38.78928 -122.75416 1.499 0.50 2 1.19 0A.1 tech 3D gE usgs GGF
72733870 2016/12/06 18:23:57.470 38.83915 -122.78334 7.993 1.00 2 0.46 0A.1 tech 3D gE usgs GGF
72733860 2016/12/06 18:12:56.600 38.82911 -122.80857 2.873 1.10 1 1.01 0A.1 tech 3D gE usgs GGF
72733840 2016/12/06 17:02:8.860 38.80618 -122.77352 1.482 1.00 1 1.45 0A.1 tech 3D gE usgs GGF
72733835 2016/12/06 16:51:23.150 36.47091 -121.00779 7.884 2.10 1 1.51 1A.1 tech 3D gE usgs
72733830 2016/12/06 16:41:32.360 36.53297 -121.07020 8.328 0.90 1 1.06 0A.1 tech 3D gE usgs
72733820 2016/12/06 16:20:55.580 36.00480 -120.57400 0.540 0.80 - - 0A.0 tech 3D gE usgs
72733810 2016/12/06 15:32:26.850 36.53578 -121.06638 7.860 2.30 1 3.04 0A.1 tech 3D gE usgs
72733800 2016/12/06 15:15:14.640 37.21746 -120.17069 4.127 2.30 2 0.10 0A.1 tech 3D gE usgs
72733795 2016/12/06 14:25:9.880 38.83107 -122.77970 1.020 1.00 2 1.02 0A.1 tech 3D gE usgs GGF
72733790 2016/12/06 13:57:41.940 38.83298 -122.85064 1.832 0.40 2 0.56 0A.1 tech 3D gE usgs GGF
72733785 2016/12/06 13:29:52.100 38.82732 -122.81549 0.511 1.00 1 0.69 0A.1 tech 3D gE usgs GGF
72733775 2016/12/06 13:09:8.600 38.79995 -122.80967 2.967 1.40 2 1.01 0A.1 tech 3D gE usgs GGF
72733765 2016/12/06 12:21:3.470 38.84362 -122.83013 2.818 0.70 2 1.20 0A.1 tech 3D gE usgs GGF
72733740 2016/12/06 11:28:13.440 38.82615 -122.82564 1.586 1.40 2 0.85 0A.1 tech 3D gE usgs GGF
72733735 2016/12/06 11:02:12.960 38.85165 -122.83206 0.253 0.20 2 0.44 0A.1 tech 3D gE usgs GGF
72733725 2016/12/06 11:00:3.830 38.82686 -122.82771 0.539 1.70 2 0.53 0A.1 tech 3D gE usgs GGF
72733730 2016/12/06 11:00:10.090 38.82514 -122.82630 1.070 1.30 2 1.06 0A.1 tech 3D gE usgs GGF
72733720 2016/12/06 10:55:39.610 37.26027 -120.06449 24.238 1.80 2 0.48 2F.1 tech 3D gE usgs
72733715 2016/12/06 10:51:14.520 38.82350 -122.82382 1.484 0.80 2 0.79 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72732765 2016/12/04 06:47:16.320 35.99273 -120.11913 14.617 2.30 2 2.14 3F.1 tech 3D gE usgs
72732655 2016/12/04 03:01:55.830 36.00267 -120.10507 17.696 1.60 1 1.48 2F.1 tech 3D gE usgs
72733880 2016/12/06 19:06:51.760 38.78928 -122.75416 1.499 0.50 2 1.19 0A.1 tech 3D gE usgs GGF
72732635 2016/12/04 01:38:28.050 38.80212 -122.77108 3.280 1.30 1 1.17 2F.1 tech 3D gE usgs GGF
72732770 2016/12/04 06:48:40.440 35.99235 -120.11475 14.685 2.10 2 3.17 3F.1 tech 3D gE usgs
72733340 2016/12/05 14:53:33.220 37.49383 -118.99579 5.415 1.20 1 2.23 2F.1 tech 3D gE usgs LVC
72733265 2016/12/05 11:14:50.050 37.66081 -118.90493 5.338 1.00 2 1.79 2F.1 tech 3D gE usgs LVC
72732625 2016/12/04 00:09:35.000 38.78575 -122.76331 1.791 1.00 1 0.53 2F.1 tech 3D gE usgs GGF
72733250 2016/12/05 10:25:54.830 37.64389 -118.94834 7.771 0.80 1 2.84 2F.1 tech 3D gE usgs LVC
72733870 2016/12/06 18:23:57.470 38.83915 -122.78334 7.993 1.00 2 0.46 0A.1 tech 3D gE usgs GGF


____________________________________________________________________________________________________
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.