REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Tue Sep 1 20:11:56 UTC 2015    [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:
2015-08-17 M4.0 Fremont
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
2015: 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
72517266 2015/09/01 19:36:10.900 38.05450 -122.59230 5.210 2.00 - - 0A.0 tech 3D gE usgs
72517246 2015/09/01 19:05:59.700 38.30320 -122.86420 7.960 0.00 - - 0A.0 tech 3D gE usgs
72517221 2015/09/01 18:43:21.410 37.60072 -118.78637 8.974 0.60 2 0.34 2F.1 tech 3D gE usgs LVC
72517206 2015/09/01 18:32:58.440 37.98285 -122.45317 1.168 1.40 2 1.04 0A.1 tech 3D gE usgs
72517181 2015/09/01 17:57:32.340 38.84015 -122.87834 2.090 0.60 1 0.42 0A.1 tech 3D gE usgs GGF
72517171 2015/09/01 17:35:32.030 38.79959 -122.79865 0.003 0.60 1 1.62 0A.1 tech 3D gE usgs GGF
72517141 2015/09/01 16:50:41.110 37.64379 -118.96472 7.756 0.30 2 1.66 2F.1 tech 3D gE usgs LVC
72517041 2015/09/01 14:49:50.770 38.84317 -122.82608 1.863 0.20 2 0.57 0A.1 tech 3D gE usgs GGF
72517021 2015/09/01 14:17:7.350 37.59770 -118.78778 6.337 0.90 1 0.54 2F.1 tech 3D gE usgs LVC
72517016 2015/09/01 14:15:0.080 38.80242 -122.82111 3.562 1.50 2 0.54 1A.1 tech 3D gE usgs GGF
72517011 2015/09/01 14:10:38.110 40.26488 -124.17128 11.743 1.80 2 2.37 0A.1 tech 3D gE usgs MTJ
72517006 2015/09/01 13:47:33.160 37.18280 -121.58160 3.309 1.70 1 0.51 3F.1 tech 3D gE usgs CAL
72516996 2015/09/01 13:27:46.410 38.83895 -122.84079 2.362 1.70 1 0.33 1A.1 tech 3D gE usgs GGF
72516991 2015/09/01 13:27:29.470 38.84154 -122.83964 2.181 1.80 2 0.30 1A.1 tech 3D gE usgs GGF
72516981 2015/09/01 12:57:25.130 37.13926 -121.53045 8.261 1.70 2 0.37 0A.1 tech 3D gE usgs CAL
72516971 2015/09/01 12:12:30.700 35.69580 -120.20150 2.420 1.60 - - 0A.0 tech 3D gE usgs
72516961 2015/09/01 11:59:25.800 38.81895 -122.82149 4.959 0.60 2 1.40 0A.1 tech 3D gE usgs GGF
72516956 2015/09/01 11:29:23.160 39.04090 -123.07706 2.847 1.70 1 0.74 2F.1 tech 3D gE usgs
72516951 2015/09/01 11:21:2.980 38.81382 -122.81947 3.907 1.90 1 0.82 1A.1 tech 3D gE usgs GGF
72516936 2015/09/01 10:18:55.330 38.70575 -122.90360 3.099 1.60 1 3.67 0A.1 tech 3D gE usgs

Events last re/processed:
72517266 2015/09/01 19:36:10.900 38.05450 -122.59230 5.210 2.00 - - 0A.0 tech 3D gE usgs
72517221 2015/09/01 18:43:21.410 37.60072 -118.78637 8.974 0.60 2 0.34 2F.1 tech 3D gE usgs LVC
72517246 2015/09/01 19:05:59.700 38.30320 -122.86420 7.960 0.00 - - 0A.0 tech 3D gE usgs
72516956 2015/09/01 11:29:23.160 39.04090 -123.07706 2.847 1.70 1 0.74 2F.1 tech 3D gE usgs
72516161 2015/08/31 05:48:19.130 35.99433 -120.55479 4.739 1.90 1 0.96 3F.1 tech 3D gE usgs PKF
72517206 2015/09/01 18:32:58.440 37.98285 -122.45317 1.168 1.40 2 1.04 0A.1 tech 3D gE usgs
72511701 2015/08/24 05:58:4.040 40.19839 -121.04277 7.367 1.90 1 0.55 4F.1 tech 3D gE usgs
72516546 2015/08/31 19:26:56.360 38.82138 -122.77644 1.310 0.30 1 1.03 3F.1 tech 3D gE usgs GGF
72516541 2015/08/31 19:17:44.880 38.81150 -122.81419 2.869 0.40 1 0.50 3F.1 tech 3D gE usgs GGF
72517006 2015/09/01 13:47:33.160 37.18280 -121.58160 3.309 1.70 1 0.51 3F.1 tech 3D gE usgs CAL


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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.