REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sat Feb 25 09:12:30 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
72767696 2017/02/25 08:46:1.940 38.81541 -122.82211 3.873 0.40 2 0.95 0A.1 tech 3D gE usgs GGF
72767686 2017/02/25 07:41:6.680 36.42764 -120.94493 7.548 1.40 2 0.75 0A.1 tech 3D gE usgs
72767676 2017/02/25 05:46:48.690 39.53580 -123.28500 20.160 2.10 - - 0A.0 tech 3D gE usgs
72767671 2017/02/25 05:36:2.410 37.49800 -118.84480 6.800 0.90 - - 0A.0 tech 3D gE usgs LVC
72767661 2017/02/25 03:28:24.270 37.55033 -118.80200 1.453 0.80 1 1.61 3F.1 tech 3D gE usgs LVC
72767656 2017/02/25 03:20:7.680 37.55306 -118.80699 1.881 1.10 1 1.92 0A.1 tech 3D gE usgs LVC
72767651 2017/02/25 03:06:49.160 36.18128 -120.15845 6.407 1.70 2 1.86 3F.1 tech 3D gE usgs
72767646 2017/02/25 02:46:2.720 38.79316 -122.82417 2.798 1.00 1 0.77 2F.1 tech 3D gE usgs GGF
72767641 2017/02/25 02:42:34.640 40.79869 -123.80336 21.204 1.80 2 0.02 3F.1 tech 3D gE usgs MTJ
72767631 2017/02/25 01:45:24.960 38.79447 -122.86252 9.855 0.90 2 0.93 0A.1 tech 3D gE usgs GGF
72767626 2017/02/25 01:26:19.760 37.52544 -118.45617 5.999 0.80 2 1.68 3F.1 tech 3D gE usgs
72767621 2017/02/25 01:04:40.940 37.61834 -118.86317 0.730 -0.10 1 0.44 2F.1 tech 3D gE usgs LVC
72767616 2017/02/25 00:37:4.870 38.74498 -122.70815 3.755 0.50 1 0.61 0A.1 tech 3D gE usgs GGF
72767601 2017/02/24 23:19:1.620 38.80654 -122.73867 2.607 1.20 2 1.10 0A.1 tech 3D gE usgs GGF
72767596 2017/02/24 22:52:1.800 38.78560 -122.83483 12.783 0.60 2 1.65 0A.1 tech 3D gE usgs GGF
72767586 2017/02/24 21:54:46.430 39.40680 -122.39820 3.480 0.00 - - 0A.0 tech 3D gE usgs
72767566 2017/02/24 20:58:29.650 38.83521 -122.80794 1.139 0.50 1 1.06 0A.1 tech 3D gE usgs GGF
72767556 2017/02/24 20:23:48.320 38.82369 -122.78385 2.689 0.90 1 1.15 0A.1 tech 3D gE usgs GGF
72767546 2017/02/24 19:44:56.270 38.83852 -122.84960 3.536 0.10 2 2.09 0A.1 tech 3D gE usgs GGF
72767541 2017/02/24 19:37:21.170 38.78402 -122.73809 1.928 0.50 1 0.39 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72767696 2017/02/25 08:46:1.940 38.81541 -122.82211 3.873 0.40 2 0.95 0A.1 tech 3D gE usgs GGF
72767686 2017/02/25 07:41:6.680 36.42764 -120.94493 7.548 1.40 2 0.75 0A.1 tech 3D gE usgs
72767391 2017/02/24 09:28:5.450 38.84759 -122.71017 3.391 0.90 1 0.75 2F.1 tech 3D gE usgs GGF
72767381 2017/02/24 08:47:32.850 35.92086 -120.47694 5.146 0.30 2 1.13 2F.1 tech 3D gE usgs PKF
72766641 2017/02/22 18:14:49.600 38.81188 -122.78343 1.405 0.20 1 0.71 3F.1 tech 3D gE usgs GGF
72767341 2017/02/24 06:38:1.040 38.79624 -122.88171 1.180 0.70 1 0.51 2F.1 tech 3D gE usgs GGF
72767326 2017/02/24 05:23:18.910 38.83557 -122.77306 2.357 0.30 1 0.79 2F.1 tech 3D gE usgs GGF
72767251 2017/02/24 00:01:15.900 38.78633 -122.77211 2.354 1.20 1 0.57 2F.1 tech 3D gE usgs GGF
72767246 2017/02/23 23:53:8.990 38.75054 -122.69659 2.260 1.20 2 1.37 4F.1 tech 3D gE usgs GGF
72767246 2017/02/23 23:53:8.990 38.75054 -122.69659 2.260 1.20 2 1.37 2F.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.