REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Thu Jul 24 02:01:31 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:
2011-10-20 M4.0 Berkeley
2012-08-06 M4.4 Parkfield
2012-10-21 M5.3 King City

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
72263446 2014/07/23 23:57:40.000 38.79176 -122.74850 1.657 0.80 1 0.18 0A.1 tech 3D gE usgs GGF
72263431 2014/07/23 23:55:53.890 38.80750 -122.81502 3.357 1.10 2 0.60 1A.1 tech 3D gE usgs GGF
72263436 2014/07/23 23:54:40.500 38.80327 -122.76843 0.268 0.90 1 0.26 0A.1 tech 3D gE usgs GGF
72263426 2014/07/23 23:50:27.700 39.99200 -120.24220 3.870 1.90 - - 0A.0 tech 3D gE usgs
72263416 2014/07/23 23:08:15.580 37.30244 -118.59678 11.434 1.20 1 0.68 0A.1 tech 3D gE usgs LVC
72263406 2014/07/23 22:35:49.380 38.84484 -122.82292 1.493 0.60 2 0.37 0A.1 tech 3D gE usgs GGF
72263401 2014/07/23 22:27:36.250 38.81389 -122.78961 3.547 0.40 2 0.52 0A.1 tech 3D gE usgs GGF
72263396 2014/07/23 22:21:40.280 38.83783 -122.87516 2.276 1.10 1 0.40 0A.1 tech 3D gE usgs GGF
72263386 2014/07/23 22:19:0.040 38.83613 -122.83001 2.943 0.60 1 0.21 0A.1 tech 3D gE usgs GGF
72263366 2014/07/23 21:47:40.550 37.35386 -121.71519 7.825 1.20 1 4.26 0A.1 tech 3D gE usgs CAL
72263351 2014/07/23 21:31:47.570 38.79261 -122.78051 2.423 1.00 1 0.24 0A.1 tech 3D gE usgs GGF
72263346 2014/07/23 21:20:32.800 38.48330 -121.24050 5.460 0.00 - - 0A.0 tech 3D gE usgs
72263331 2014/07/23 21:03:16.250 36.73936 -121.41030 6.587 1.70 2 1.83 1A.1 tech 3D gE usgs
72263326 2014/07/23 21:00:54.140 36.73914 -121.41031 6.567 1.30 1 1.83 0A.1 tech 3D gE usgs
72263321 2014/07/23 20:56:56.000 38.22120 -120.30000 4.880 0.00 - - 0A.0 tech 3D gE usgs
72263316 2014/07/23 20:56:45.940 38.81100 -122.82076 3.819 0.60 2 0.54 0A.1 tech 3D gE usgs GGF
72263306 2014/07/23 20:38:5.970 36.57061 -121.02742 9.254 0.90 1 2.39 0A.1 tech 3D gE usgs
72263296 2014/07/23 20:07:0.400 38.78595 -122.74647 0.210 1.40 2 2.26 0A.1 tech 3D gE usgs GGF
72263291 2014/07/23 19:47:5.950 38.83801 -122.78402 2.634 0.80 2 0.33 0A.1 tech 3D gE usgs GGF
72263286 2014/07/23 19:16:34.770 38.83254 -122.74577 1.664 0.90 1 0.46 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72257416 2014/07/14 22:19:43.110 35.84231 -119.83275 7.098 1.90 2 3.16 2F.1 tech 3D gE usgs
72257411 2014/07/14 22:15:52.920 35.84506 -119.79699 5.294 2.00 2 1.36 2F.1 tech 3D gE usgs
72252815 2014/07/12 22:12:57.620 38.76193 -122.72636 1.203 1.40 1 0.59 2F.1 tech 3D gE usgs GGF
72257361 2014/07/14 20:43:37.300 35.82928 -119.84545 6.291 2.00 1 3.86 2F.1 tech 3D gE usgs
72252800 2014/07/12 21:46:56.610 37.74930 -122.13280 7.269 1.30 1 1.13 2F.1 tech 3D gE usgs HAY
72263446 2014/07/23 23:57:40.000 38.79176 -122.74850 1.657 0.80 1 0.18 0A.1 tech 3D gE usgs GGF
72263431 2014/07/23 23:55:53.890 38.80750 -122.81502 3.357 1.10 2 0.60 1A.1 tech 3D gE usgs GGF
72263436 2014/07/23 23:54:40.500 38.80327 -122.76843 0.268 0.90 1 0.26 0A.1 tech 3D gE usgs GGF
72253645 2014/07/14 07:42:32.370 37.62651 -121.99631 9.609 0.90 2 1.31 3F.1 tech 3D gE usgs HAY CAL
72261026 2014/07/20 16:19:4.900 36.04400 -120.60850 6.190 0.40 - - 3F.0 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.