REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sun Jun 25 17:22:37 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: 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
72821221 2017/06/25 17:05:42.410 37.57680 -118.94930 -1.440 1.10 - - 0A.0 tech 3D gE usgs LVC
72821216 2017/06/25 16:58:37.470 38.81266 -122.81051 3.434 0.90 1 0.86 0A.1 tech 3D gE usgs GGF
72821206 2017/06/25 16:47:0.650 36.35652 -120.93277 6.827 2.30 1 0.60 1A.1 tech 3D gE usgs
72821201 2017/06/25 16:45:35.630 37.58780 -118.95030 -0.620 1.10 - - 0A.0 tech 3D gE usgs LVC
72821196 2017/06/25 16:44:52.980 37.58250 -118.94980 -1.830 0.80 - - 0A.0 tech 3D gE usgs LVC
72821186 2017/06/25 15:39:2.680 38.78685 -122.77645 2.023 0.60 2 1.09 0A.1 tech 3D gE usgs GGF
72821181 2017/06/25 15:27:33.070 38.78578 -122.76251 1.943 1.20 2 0.93 0A.1 tech 3D gE usgs GGF
72821171 2017/06/25 14:54:19.120 38.85097 -122.85527 0.020 0.60 2 2.07 0A.1 tech 3D gE usgs GGF
72821161 2017/06/25 14:27:53.180 40.70149 -124.54657 17.489 2.20 2 2.00 1A.1 tech 3D gE usgs MTJ
72821131 2017/06/25 12:39:56.590 38.78742 -122.80156 2.103 0.00 2 0.79 0A.1 tech 3D gE usgs GGF
72821121 2017/06/25 11:27:17.980 38.83786 -122.78822 3.001 0.90 2 1.28 0A.1 tech 3D gE usgs GGF
72821111 2017/06/25 10:27:33.260 37.55674 -118.83182 2.247 1.20 1 2.26 0A.1 tech 3D gE usgs LVC
72821066 2017/06/25 09:16:8.180 35.91850 -120.47900 1.130 1.00 - - 0A.0 tech 3D gE usgs
72821051 2017/06/25 08:01:38.520 37.60400 -119.01930 -0.580 0.90 - - 0A.0 tech 3D gE usgs LVC
72821026 2017/06/25 07:01:41.670 37.57679 -118.95080 0.118 1.10 2 0.22 0A.1 tech 3D gE usgs LVC
72821021 2017/06/25 07:00:57.680 37.58420 -118.95400 -0.960 0.80 - - 0A.0 tech 3D gE usgs LVC
72821001 2017/06/25 05:42:54.870 37.59500 -119.00330 -0.480 1.30 - - 0A.0 tech 3D gE usgs LVC
72820991 2017/06/25 05:14:37.230 35.98130 -120.18070 13.490 0.00 - - 0A.0 tech 3D gE usgs
72820951 2017/06/25 04:16:31.590 38.79026 -122.80049 4.016 0.90 2 1.23 0A.1 tech 3D gE usgs GGF
72820936 2017/06/25 03:51:22.470 37.55673 -119.02826 2.869 1.80 1 2.88 0A.1 tech 3D gE usgs LVC

Events last re/processed:
72821221 2017/06/25 17:05:42.410 37.57680 -118.94930 -1.440 1.10 - - 0A.0 tech 3D gE usgs LVC
72821216 2017/06/25 16:58:37.470 38.81266 -122.81051 3.434 0.90 1 0.86 0A.1 tech 3D gE usgs GGF
72821206 2017/06/25 16:47:0.650 36.35652 -120.93277 6.827 2.30 1 0.60 1A.1 tech 3D gE usgs
72821201 2017/06/25 16:45:35.630 37.58780 -118.95030 -0.620 1.10 - - 0A.0 tech 3D gE usgs LVC
72821196 2017/06/25 16:44:52.980 37.58250 -118.94980 -1.830 0.80 - - 0A.0 tech 3D gE usgs LVC
72821186 2017/06/25 15:39:2.680 38.78685 -122.77645 2.023 0.60 2 1.09 0A.1 tech 3D gE usgs GGF
72821181 2017/06/25 15:27:33.070 38.78578 -122.76251 1.943 1.20 2 0.93 0A.1 tech 3D gE usgs GGF
72821171 2017/06/25 14:54:19.120 38.85097 -122.85527 0.020 0.60 2 2.07 0A.1 tech 3D gE usgs GGF
72821161 2017/06/25 14:27:53.180 40.70149 -124.54657 17.489 2.20 2 2.00 1A.1 tech 3D gE usgs MTJ
72821131 2017/06/25 12:39:56.590 38.78742 -122.80156 2.103 0.00 2 0.79 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.