REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sat Mar 25 09:32:15 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
72780411 2017/03/25 09:21:43.580 38.83668 -122.84279 0.660 0.40 2 0.23 0A.1 tech 3D gE usgs GGF
72780401 2017/03/25 08:46:41.980 38.78504 -122.76346 1.313 1.90 2 1.32 0A.1 tech 3D gE usgs GGF
72780396 2017/03/25 08:36:9.190 37.61334 -122.45755 8.529 0.80 1 0.36 0A.1 tech 3D gE usgs
72780391 2017/03/25 08:27:53.120 38.85040 -122.81822 12.418 0.10 2 0.16 0A.1 tech 3D gE usgs GGF
72780386 2017/03/25 08:14:53.780 40.42020 -124.28150 29.990 2.40 - - 1A.0 tech 3D gE usgs MTJ
72780376 2017/03/25 08:03:46.350 38.77090 -122.86423 10.710 1.20 1 1.99 0A.1 tech 3D gE usgs GGF
72780371 2017/03/25 07:20:24.480 38.82889 -122.84908 2.016 0.20 2 0.74 0A.1 tech 3D gE usgs GGF
72780341 2017/03/25 05:35:14.390 37.13720 -119.06000 2.700 1.10 - - 0A.0 tech 3D gE usgs
72780331 2017/03/25 05:00:28.770 38.80789 -122.82042 3.819 2.20 2 1.23 1A.1 tech 3D gE usgs GGF
72780336 2017/03/25 04:59:31.620 38.76403 -122.91582 14.430 1.40 2 5.79 0A.1 tech 3D gE usgs GGF
72780326 2017/03/25 04:58:59.910 36.63939 -121.25666 5.220 2.00 1 1.18 1A.1 tech 3D gE usgs
72780311 2017/03/25 03:13:42.270 38.80464 -122.82296 3.887 0.70 1 0.67 2F.1 tech 3D gE usgs GGF
72780306 2017/03/25 02:20:37.480 38.82089 -122.81325 4.122 0.50 2 1.59 0A.1 tech 3D gE usgs GGF
72780301 2017/03/25 02:18:6.130 38.78449 -122.74533 1.975 1.50 2 1.28 2F.1 tech 3D gE usgs GGF
72780296 2017/03/25 02:15:58.580 38.83204 -122.79656 2.019 0.40 2 0.80 0A.1 tech 3D gE usgs GGF
72780291 2017/03/25 01:07:38.420 37.97720 -121.40880 22.480 1.90 - - 3F.0 tech 3D gE usgs
72780286 2017/03/25 00:53:28.750 37.51251 -118.67748 14.840 2.20 1 1.67 3F.1 tech 3D gE usgs LVC
72780276 2017/03/25 00:13:47.660 38.80265 -122.82177 8.184 0.60 2 4.67 0A.1 tech 3D gE usgs GGF
72780271 2017/03/25 00:03:41.840 38.83658 -122.78688 2.918 1.00 2 2.00 0A.1 tech 3D gE usgs GGF
72780266 2017/03/25 00:00:33.130 38.81426 -122.81515 3.532 1.10 2 1.17 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72780411 2017/03/25 09:21:43.580 38.83668 -122.84279 0.660 0.40 2 0.23 0A.1 tech 3D gE usgs GGF
72780401 2017/03/25 08:46:41.980 38.78504 -122.76346 1.313 1.90 2 1.32 0A.1 tech 3D gE usgs GGF
72780396 2017/03/25 08:36:9.190 37.61334 -122.45755 8.529 0.80 1 0.36 0A.1 tech 3D gE usgs
72780391 2017/03/25 08:27:53.120 38.85040 -122.81822 12.418 0.10 2 0.16 0A.1 tech 3D gE usgs GGF
72780386 2017/03/25 08:14:53.780 40.42020 -124.28150 29.990 2.40 - - 1A.0 tech 3D gE usgs MTJ
72780376 2017/03/25 08:03:46.350 38.77090 -122.86423 10.710 1.20 1 1.99 0A.1 tech 3D gE usgs GGF
72780371 2017/03/25 07:20:24.480 38.82889 -122.84908 2.016 0.20 2 0.74 0A.1 tech 3D gE usgs GGF
72780311 2017/03/25 03:13:42.270 38.80464 -122.82296 3.887 0.70 1 0.67 2F.1 tech 3D gE usgs GGF
72780301 2017/03/25 02:18:6.130 38.78449 -122.74533 1.975 1.50 2 1.28 2F.1 tech 3D gE usgs GGF
72780146 2017/03/24 16:29:54.600 38.75966 -122.71943 1.806 0.40 1 0.77 3F.1 tech 3D gE usgs GGF


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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.