REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Thu Oct 23 15:01:51 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: 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
72332296 2014/10/23 14:55:49.200 38.03820 -121.86470 5.000 0.00 - - 0A.0 tech 3D gE usgs
72332286 2014/10/23 14:37:40.080 37.47752 -118.78435 6.490 1.40 1 0.49 0A.1 tech 3D gE usgs LVC
72332281 2014/10/23 14:28:58.900 38.03000 -122.87000 4.900 0.00 - - 0A.0 tech 3D gE usgs
72332276 2014/10/23 14:22:3.310 38.79297 -122.74511 2.202 0.90 2 0.86 0A.1 tech 3D gE usgs GGF
72332271 2014/10/23 14:16:26.500 40.19720 -119.84300 0.040 2.40 - - 0A.0 tech 3D gE usgs
72332261 2014/10/23 14:13:14.730 38.81859 -122.76239 2.273 0.50 2 0.77 0A.1 tech 3D gE usgs GGF
72332241 2014/10/23 13:50:40.880 38.81482 -122.79375 3.660 0.50 1 0.66 0A.1 tech 3D gE usgs GGF
72332231 2014/10/23 13:31:29.700 37.48306 -118.78093 6.800 1.50 1 0.86 0A.1 tech 3D gE usgs LVC
72332221 2014/10/23 13:05:37.900 36.02130 -120.58650 2.040 0.80 - - 0A.0 tech 3D gE usgs
72332186 2014/10/23 11:39:34.330 39.39600 -120.16296 8.928 0.90 1 0.82 0A.1 tech 3D gE usgs
72332181 2014/10/23 11:12:38.960 38.80254 -122.76636 2.223 0.10 1 0.83 0A.1 tech 3D gE usgs GGF
72332141 2014/10/23 08:23:3.620 37.47599 -118.78375 6.169 1.50 1 0.70 0A.1 tech 3D gE usgs LVC
72332136 2014/10/23 08:00:41.110 38.82097 -122.75756 2.537 0.90 1 0.61 0A.1 tech 3D gE usgs GGF
72332131 2014/10/23 07:57:55.970 38.81811 -122.80820 6.208 0.10 2 0.70 0A.1 tech 3D gE usgs GGF
72332121 2014/10/23 07:39:29.330 38.81817 -122.80250 3.784 0.50 1 0.54 0A.1 tech 3D gE usgs GGF
72332111 2014/10/23 07:08:4.200 38.84353 -122.79997 2.208 0.40 2 0.30 0A.1 tech 3D gE usgs GGF
72332106 2014/10/23 06:19:30.440 38.83725 -122.85583 2.144 0.50 2 0.40 0A.1 tech 3D gE usgs GGF
72332096 2014/10/23 06:12:0.280 38.80944 -122.83658 3.565 0.10 1 1.33 0A.1 tech 3D gE usgs GGF
72332081 2014/10/23 05:37:52.940 40.29728 -124.32432 21.314 2.40 2 1.20 0A.1 tech 3D gE usgs MTJ
72332076 2014/10/23 05:36:56.750 38.83408 -122.82107 0.025 0.80 2 0.77 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72332296 2014/10/23 14:55:49.200 38.03820 -121.86470 5.000 0.00 - - 0A.0 tech 3D gE usgs
72332286 2014/10/23 14:37:40.080 37.47752 -118.78435 6.490 1.40 1 0.49 0A.1 tech 3D gE usgs LVC
72332281 2014/10/23 14:28:58.900 38.03000 -122.87000 4.900 0.00 - - 0A.0 tech 3D gE usgs
72332276 2014/10/23 14:22:3.310 38.79297 -122.74511 2.202 0.90 2 0.86 0A.1 tech 3D gE usgs GGF
72332271 2014/10/23 14:16:26.500 40.19720 -119.84300 0.040 2.40 - - 0A.0 tech 3D gE usgs
72332261 2014/10/23 14:13:14.730 38.81859 -122.76239 2.273 0.50 2 0.77 0A.1 tech 3D gE usgs GGF
72332241 2014/10/23 13:50:40.880 38.81482 -122.79375 3.660 0.50 1 0.66 0A.1 tech 3D gE usgs GGF
72332231 2014/10/23 13:31:29.700 37.48306 -118.78093 6.800 1.50 1 0.86 0A.1 tech 3D gE usgs LVC
72332221 2014/10/23 13:05:37.900 36.02130 -120.58650 2.040 0.80 - - 0A.0 tech 3D gE usgs
72332186 2014/10/23 11:39:34.330 39.39600 -120.16296 8.928 0.90 1 0.82 0A.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.