REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sat Sep 20 01:51:52 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
72302271 2014/09/20 01:03:57.820 37.54742 -121.92983 8.364 1.60 1 0.61 0A.1 tech 3D gE usgs HAY CAL
72302256 2014/09/20 00:33:21.400 36.02530 -117.86000 7.840 3.50 - - 3A.0 tech 3D gE usgs
72302251 2014/09/20 00:21:57.710 38.81076 -122.81409 2.719 1.60 1 0.53 1A.1 tech 3D gE usgs GGF
72302246 2014/09/20 00:16:27.080 38.80144 -122.81025 3.859 0.60 2 0.61 0A.1 tech 3D gE usgs GGF
72302231 2014/09/19 23:34:20.570 38.66479 -122.81952 6.974 1.70 1 1.47 0A.1 tech 3D gE usgs
72302216 2014/09/19 22:24:24.170 38.82852 -122.79560 3.709 0.90 1 0.33 1A.1 tech 3D gE usgs GGF
72302211 2014/09/19 22:22:48.560 38.83876 -122.82726 2.458 1.20 1 0.24 0A.1 tech 3D gE usgs GGF
72302206 2014/09/19 22:21:44.750 36.49587 -121.44504 9.326 1.40 2 0.29 0A.1 tech 3D gE usgs
72302186 2014/09/19 21:40:29.240 36.65168 -121.23357 4.959 1.30 2 0.95 0A.1 tech 3D gE usgs
72302176 2014/09/19 21:26:29.040 38.80592 -122.80076 2.187 0.40 2 0.62 0A.1 tech 3D gE usgs GGF
72302161 2014/09/19 20:49:11.990 37.57010 -119.02433 4.807 0.20 1 0.61 2F.1 tech 3D gE usgs LVC
72302141 2014/09/19 20:24:47.270 38.78664 -122.76255 1.934 0.30 1 4.67 0A.1 tech 3D gE usgs GGF
72302131 2014/09/19 20:23:16.370 38.35981 -122.39558 6.901 1.60 2 1.10 0A.1 tech 3D gE usgs
72302181 2014/09/19 20:09:23.200 37.63607 -119.33774 9.370 0.70 1 1.87 2F.1 tech 3D gE usgs
72302121 2014/09/19 20:01:45.400 35.85650 -120.41030 2.420 0.00 - - 0A.0 tech 3D gE usgs
72302116 2014/09/19 19:56:33.420 40.33919 -124.18640 27.305 1.70 1 1.03 0A.1 tech 3D gE usgs MTJ
72302106 2014/09/19 19:51:47.930 38.84090 -122.80772 2.904 0.70 2 0.61 0A.1 tech 3D gE usgs GGF
72302111 2014/09/19 19:51:16.600 39.65320 -123.40780 4.770 0.00 - - 0A.0 tech 3D gE usgs
72302096 2014/09/19 19:02:26.050 38.21632 -122.31335 7.353 1.70 2 1.07 0A.1 tech 3D gE usgs
72302091 2014/09/19 19:00:21.400 38.45430 -122.58630 0.160 0.00 - - 0A.0 tech 3D gE usgs

Events last re/processed:
72299596 2014/09/15 15:58:5.360 38.77195 -122.71401 2.471 1.10 1 0.47 2F.1 tech 3D gE usgs GGF
72299201 2014/09/15 05:47:39.680 38.73307 -122.71434 3.674 1.10 1 1.26 2F.1 tech 3D gE usgs GGF
72302271 2014/09/20 01:03:57.820 37.54742 -121.92983 8.364 1.60 1 0.61 0A.1 tech 3D gE usgs HAY CAL
72299006 2014/09/14 23:48:36.500 38.36594 -122.14198 6.895 1.90 1 2.98 2F.1 tech 3D gE usgs
72302256 2014/09/20 00:33:21.400 36.02530 -117.86000 7.840 3.50 - - 3A.0 tech 3D gE usgs
72302251 2014/09/20 00:21:57.710 38.81076 -122.81409 2.719 1.60 1 0.53 1A.1 tech 3D gE usgs GGF
72282716 2014/08/24 10:21:45.510 38.23206 -122.31974 9.121 3.80 2 0.33 9F.1 tech 3D gE usgs
72302246 2014/09/20 00:16:27.080 38.80144 -122.81025 3.859 0.60 2 0.61 0A.1 tech 3D gE usgs GGF
71086369 2014/08/24 10:21:10.950 38.76167 -122.73569 0.566 0.00 1 0.91 5F.1 tech 3D gE usgs GGF
72301976 2014/09/19 14:37:56.500 38.33217 -122.36750 9.603 1.20 1 1.15 2F.1 tech 3D gE usgs


____________________________________________________________________________________________________
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.