REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Tue Jul 29 20:42:17 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: 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
72267356 2014/07/29 20:24:6.140 38.84563 -122.88079 1.653 0.80 2 1.13 0A.1 tech 3D gE usgs GGF
72267321 2014/07/29 19:01:39.270 38.78698 -122.76276 1.603 0.50 2 0.39 0A.1 tech 3D gE usgs GGF
72267311 2014/07/29 18:29:9.390 38.78734 -122.73694 2.473 1.30 1 0.26 1A.1 tech 3D gE usgs GGF
72267306 2014/07/29 18:27:21.190 39.74888 -120.60562 5.769 1.30 1 2.41 0A.1 tech 3D gE usgs
72267301 2014/07/29 18:23:35.860 36.01375 -120.57279 4.678 1.80 1 0.65 1A.1 tech 3D gE usgs PKF
72267296 2014/07/29 18:18:40.700 38.78630 -123.37870 5.000 0.00 - - 0A.0 tech 3D gE usgs
72267291 2014/07/29 18:13:23.690 36.22690 -120.33833 9.724 1.90 2 0.48 0A.1 tech 3D gE usgs
72267276 2014/07/29 17:43:10.990 38.74372 -122.38113 7.986 2.20 1 0.81 1A.1 tech 3D gE usgs
72267271 2014/07/29 17:40:4.380 38.79523 -122.75573 2.955 1.00 1 0.67 0A.1 tech 3D gE usgs GGF
72267266 2014/07/29 17:31:59.860 35.72980 -121.10251 6.679 1.00 1 1.01 0A.1 tech 3D gE usgs
72267261 2014/07/29 17:29:32.050 37.31868 -122.10831 0.521 1.40 1 0.28 0A.1 tech 3D gE usgs
72267251 2014/07/29 17:22:26.090 38.83939 -122.80619 2.566 0.70 2 0.17 0A.1 tech 3D gE usgs GGF
72267241 2014/07/29 16:55:34.360 38.77180 -122.74627 2.909 0.30 1 0.33 0A.1 tech 3D gE usgs GGF
72267231 2014/07/29 16:40:5.340 35.48916 -120.78915 4.598 1.10 2 0.34 0A.1 tech 3D gE usgs
72267226 2014/07/29 16:38:6.600 38.74848 -122.73045 3.472 1.30 2 3.77 0A.1 tech 3D gE usgs GGF
72267221 2014/07/29 16:37:44.730 38.75486 -122.73028 2.227 0.50 2 0.37 0A.1 tech 3D gE usgs GGF
72267216 2014/07/29 16:04:51.320 38.80521 -122.82307 3.044 0.80 2 0.23 0A.1 tech 3D gE usgs GGF
72267211 2014/07/29 16:02:35.100 38.75831 -122.72651 1.945 0.50 1 0.80 0A.1 tech 3D gE usgs GGF
72267201 2014/07/29 14:59:22.320 38.84110 -122.87785 2.256 1.10 2 0.46 0A.1 tech 3D gE usgs GGF
72267196 2014/07/29 14:57:44.900 38.76056 -122.70589 3.134 0.60 2 0.92 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72260726 2014/07/20 04:18:37.630 37.70370 -121.93289 10.035 1.10 1 2.20 2F.1 tech 3D gE usgs
72267356 2014/07/29 20:24:6.140 38.84563 -122.88079 1.653 0.80 2 1.13 0A.1 tech 3D gE usgs GGF
72260706 2014/07/20 04:01:19.410 38.75595 -122.71497 2.185 1.00 1 0.33 2F.1 tech 3D gE usgs GGF
72267321 2014/07/29 19:01:39.270 38.78698 -122.76276 1.603 0.50 2 0.39 0A.1 tech 3D gE usgs GGF
72265771 2014/07/28 07:04:6.700 37.64284 -118.94549 7.209 0.20 1 0.24 2F.1 tech 3D gE usgs LVC
72260666 2014/07/20 03:08:45.530 37.53284 -118.81519 6.991 1.30 1 0.32 2F.1 tech 3D gE usgs LVC
72260631 2014/07/20 01:10:23.880 38.82658 -122.79937 2.344 1.10 1 0.15 2F.1 tech 3D gE usgs GGF
72267311 2014/07/29 18:29:9.390 38.78734 -122.73694 2.473 1.30 1 0.26 1A.1 tech 3D gE usgs GGF
72267306 2014/07/29 18:27:21.190 39.74888 -120.60562 5.769 1.30 1 2.41 0A.1 tech 3D gE usgs
72260626 2014/07/20 01:04:22.680 40.28479 -121.39198 3.498 2.30 1 1.96 2F.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.