REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Wed Jul 27 05:22:14 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
72666901 2016/07/27 05:04:31.460 37.67950 -121.72230 17.400 1.80 - - 0A.0 tech 3D gE usgs
72666896 2016/07/27 04:35:45.160 37.60283 -119.02846 0.018 0.60 1 1.92 0A.1 tech 3D gE usgs LVC
72666881 2016/07/27 04:19:43.150 37.78180 -121.83920 15.230 1.50 - - 0A.0 tech 3D gE usgs
72666861 2016/07/27 03:48:47.130 35.69042 -121.12349 5.488 1.40 1 1.32 0A.1 tech 3D gE usgs
72666856 2016/07/27 03:42:18.310 37.68541 -121.62851 14.539 2.10 1 1.95 0A.1 tech 3D gE usgs
72666851 2016/07/27 03:23:30.170 38.49865 -122.42069 8.492 2.40 1 0.40 1A.1 tech 3D gE usgs
72666841 2016/07/27 02:35:16.530 36.68718 -121.32388 4.476 1.10 1 0.28 0A.1 tech 3D gE usgs
72666831 2016/07/27 02:14:59.250 36.05370 -120.64630 4.170 0.90 - - 0A.0 tech 3D gE usgs
72666821 2016/07/27 02:03:59.980 37.56084 -118.90238 13.650 1.00 2 5.30 0A.1 tech 3D gE usgs LVC
72666811 2016/07/27 01:54:26.030 37.67166 -121.61324 6.023 1.60 1 2.66 0A.1 tech 3D gE usgs
72666781 2016/07/27 00:33:28.280 35.66780 -121.16120 17.240 1.00 - - 0A.0 tech 3D gE usgs
72666776 2016/07/27 00:31:17.380 35.68167 -121.12363 6.583 2.20 1 0.99 1A.1 tech 3D gE usgs
72666771 2016/07/26 23:48:38.270 37.57698 -118.85773 7.546 1.10 2 2.55 0A.1 tech 3D gE usgs LVC
72666766 2016/07/26 23:34:9.970 38.81855 -122.79740 4.406 1.10 1 1.04 0A.1 tech 3D gE usgs GGF
72666756 2016/07/26 23:14:3.240 38.78914 -122.72664 2.335 1.40 2 0.82 0A.1 tech 3D gE usgs GGF
72666751 2016/07/26 23:00:1.420 37.04745 -121.12885 2.329 1.10 1 2.03 3F.1 tech 3D gE usgs
72666746 2016/07/26 22:27:29.890 38.77533 -122.72675 2.219 1.00 1 0.46 0A.1 tech 3D gE usgs GGF
72666741 2016/07/26 22:04:40.780 38.83487 -122.78250 4.700 0.50 1 1.46 0A.1 tech 3D gE usgs GGF
72666731 2016/07/26 21:23:14.110 38.50551 -122.42689 9.709 1.70 1 1.12 5F.1 tech 3D gE usgs
72666726 2016/07/26 21:08:43.160 38.83062 -122.85830 2.525 0.80 2 0.79 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72666901 2016/07/27 05:04:31.460 37.67950 -121.72230 17.400 1.80 - - 0A.0 tech 3D gE usgs
72666896 2016/07/27 04:35:45.160 37.60283 -119.02846 0.018 0.60 1 1.92 0A.1 tech 3D gE usgs LVC
72666881 2016/07/27 04:19:43.150 37.78180 -121.83920 15.230 1.50 - - 0A.0 tech 3D gE usgs
72666861 2016/07/27 03:48:47.130 35.69042 -121.12349 5.488 1.40 1 1.32 0A.1 tech 3D gE usgs
72666856 2016/07/27 03:42:18.310 37.68541 -121.62851 14.539 2.10 1 1.95 0A.1 tech 3D gE usgs
72666851 2016/07/27 03:23:30.170 38.49865 -122.42069 8.492 2.40 1 0.40 1A.1 tech 3D gE usgs
72666656 2016/07/26 16:32:1.120 36.03964 -120.57625 8.796 0.50 1 2.27 4F.1 tech 3D gE usgs PKF
72666751 2016/07/26 23:00:1.420 37.04745 -121.12885 2.329 1.10 1 2.03 3F.1 tech 3D gE usgs
72666611 2016/07/26 14:25:31.910 36.17021 -120.13238 7.586 1.60 2 1.37 3F.1 tech 3D gE usgs
72666386 2016/07/26 03:13:52.170 36.98821 -121.65555 5.495 1.90 1 1.05 3F.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.