REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sat Oct 25 05:21:39 UTC 2014    [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:
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

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: 2
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
72332991 2014/10/25 03:18:11.150 37.47348 -118.78026 7.104 1.10 1 0.59 0A.1 tech 3D gE usgs LVC
72332976 2014/10/25 02:47:42.500 37.08300 -120.39250 29.820 1.50 - - 0A.0 tech 3D gE usgs
72332961 2014/10/25 02:26:31.470 38.79042 -122.81119 4.852 0.60 2 1.35 0A.1 tech 3D gE usgs GGF
72332951 2014/10/25 02:07:52.580 38.82407 -122.85739 2.315 0.60 1 0.54 0A.1 tech 3D gE usgs GGF
72332946 2014/10/25 01:56:53.060 38.76120 -122.80224 6.441 1.80 2 0.29 0A.1 tech 3D gE usgs GGF
72332916 2014/10/25 00:20:27.170 36.56712 -121.16536 3.515 1.40 1 0.47 0A.1 tech 3D gE usgs
72332911 2014/10/25 00:15:15.190 38.80583 -122.84897 8.079 0.40 2 0.78 0A.1 tech 3D gE usgs GGF
72332906 2014/10/24 23:55:37.900 37.53320 -118.88750 2.530 0.60 - - 0A.0 tech 3D gE usgs LVC
72332901 2014/10/24 23:36:1.280 38.76901 -122.71043 2.507 0.90 1 0.48 0A.1 tech 3D gE usgs GGF
72332861 2014/10/24 21:38:9.690 38.77749 -122.71588 2.569 0.50 2 1.73 0A.1 tech 3D gE usgs GGF
72332851 2014/10/24 21:29:16.340 37.54145 -118.82884 6.459 0.80 1 1.56 2F.1 tech 3D gE usgs LVC
72332846 2014/10/24 21:14:55.450 38.77678 -122.71392 3.761 0.60 1 0.69 0A.1 tech 3D gE usgs GGF
72332841 2014/10/24 21:07:55.270 38.77767 -122.71559 2.611 1.20 1 0.85 0A.1 tech 3D gE usgs GGF
72332831 2014/10/24 20:03:37.130 40.21084 -121.29672 8.678 1.90 1 0.60 0A.1 tech 3D gE usgs
72332826 2014/10/24 20:00:34.140 40.74786 -122.30472 2.583 1.90 2 0.57 0A.1 tech 3D gE usgs
72332816 2014/10/24 19:25:5.950 38.84439 -122.82250 1.833 0.20 1 0.59 0A.1 tech 3D gE usgs GGF
72332811 2014/10/24 19:07:53.980 36.89336 -121.61746 3.122 1.40 1 2.49 0A.1 tech 3D gE usgs
72332796 2014/10/24 18:11:35.350 38.84143 -122.82439 2.138 1.60 1 0.40 1A.1 tech 3D gE usgs GGF
72332786 2014/10/24 18:03:21.400 38.53920 -122.50870 4.860 0.00 - - 0A.0 tech 3D gE usgs
72332781 2014/10/24 17:55:19.350 37.42986 -121.77299 8.990 2.20 1 0.87 1A.1 tech 3D gE usgs CAL

Events last re/processed:
72328066 2014/10/16 00:20:29.680 37.66357 -118.84928 4.697 0.30 2 0.95 2F.1 tech 3D gE usgs LVC
72328051 2014/10/16 00:04:9.550 37.66438 -118.85062 4.105 0.30 2 0.72 2F.1 tech 3D gE usgs LVC
72329331 2014/10/18 00:46:14.480 39.23497 -123.14125 0.520 1.80 2 0.63 2F.1 tech 3D gE usgs
72327971 2014/10/15 21:41:23.710 37.66279 -118.84870 4.398 1.20 1 0.49 2F.1 tech 3D gE usgs LVC
72327951 2014/10/15 20:50:20.660 37.61745 -118.86587 2.660 0.60 1 0.84 3F.1 tech 3D gE usgs LVC
72327946 2014/10/15 20:19:59.050 37.47852 -118.78588 6.660 1.30 1 0.43 2F.1 tech 3D gE usgs LVC
72327901 2014/10/15 18:33:11.730 37.47799 -118.78498 5.956 1.60 1 0.62 2F.1 tech 3D gE usgs LVC
72327811 2014/10/15 13:21:2.680 37.64670 -118.85072 4.411 0.50 1 0.95 3F.1 tech 3D gE usgs LVC
72327896 2014/10/15 18:26:0.480 37.53013 -118.83040 8.480 1.50 1 0.35 2F.1 tech 3D gE usgs LVC
72327986 2014/10/15 22:43:20.340 36.37965 -120.94865 2.349 1.10 1 0.82 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.