REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Mon Apr 20 22:53:08 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:
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
72431705 2015/04/20 22:32:1.230 38.79212 -122.72859 2.586 0.40 2 0.31 0A.1 tech 3D gE usgs GGF
72431700 2015/04/20 22:00:31.590 35.59215 -120.85964 0.323 0.90 2 0.36 0A.1 tech 3D gE usgs
72431695 2015/04/20 21:56:51.310 38.76478 -122.71692 2.153 0.70 1 0.57 0A.1 tech 3D gE usgs GGF
72431690 2015/04/20 21:49:49.120 38.83196 -122.78343 0.901 1.00 1 0.23 0A.1 tech 3D gE usgs GGF
72431680 2015/04/20 20:47:8.470 38.79592 -122.77240 1.104 0.90 2 0.22 0A.1 tech 3D gE usgs GGF
72431675 2015/04/20 20:46:56.390 38.79702 -122.77147 0.992 0.90 2 0.99 0A.1 tech 3D gE usgs GGF
72431670 2015/04/20 20:31:12.600 38.82227 -122.83729 2.604 0.10 2 0.70 0A.1 tech 3D gE usgs GGF
72431665 2015/04/20 20:23:29.770 37.59911 -118.84275 2.444 0.10 1 0.34 2F.1 tech 3D gE usgs LVC
72431660 2015/04/20 20:15:46.080 38.82422 -122.81237 4.172 1.00 1 0.66 0A.1 tech 3D gE usgs GGF
72431655 2015/04/20 20:05:6.840 38.80478 -122.79325 2.158 0.90 2 0.33 0A.1 tech 3D gE usgs GGF
72431650 2015/04/20 19:52:7.900 38.75555 -122.69584 1.233 1.00 2 0.49 0A.1 tech 3D gE usgs GGF
72431645 2015/04/20 19:42:48.940 38.52957 -122.81130 5.269 0.00 2 0.05 0A.1 tech 3D gE usgs
72431640 2015/04/20 19:37:24.440 38.43120 -123.27680 4.680 0.00 - - 0A.0 tech 3D gE usgs
72431630 2015/04/20 19:20:37.880 38.87516 -122.74621 4.603 0.00 2 0.70 0A.1 tech 3D gE usgs GGF
72431625 2015/04/20 19:18:50.470 37.13070 -121.69480 1.250 1.80 - - 0A.0 tech 3D gE usgs
72431620 2015/04/20 19:18:0.120 38.60020 -121.86120 4.940 0.00 - - 0A.0 tech 3D gE usgs
72431615 2015/04/20 18:34:22.780 36.52067 -121.10587 5.381 1.40 1 4.71 0A.1 tech 3D gE usgs
72431605 2015/04/20 18:13:19.120 38.83472 -122.78512 1.743 0.90 1 0.11 0A.1 tech 3D gE usgs GGF
72431595 2015/04/20 16:58:22.600 36.64641 -121.26873 9.913 2.30 1 0.27 1A.1 tech 3D gE usgs
72431580 2015/04/20 16:12:27.150 38.79064 -122.73355 2.281 0.90 1 0.15 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72430760 2015/04/19 04:24:4.680 37.86134 -121.78119 17.143 2.00 1 2.93 3F.1 tech 3D gE usgs
72431705 2015/04/20 22:32:1.230 38.79212 -122.72859 2.586 0.40 2 0.31 0A.1 tech 3D gE usgs GGF
72431240 2015/04/20 00:57:20.810 36.10258 -120.65683 7.927 0.60 1 0.24 2F.1 tech 3D gE usgs PKF
72430745 2015/04/19 04:14:49.440 38.81032 -122.81396 3.246 2.10 1 0.38 3F.1 tech 3D gE usgs GGF
72431665 2015/04/20 20:23:29.770 37.59911 -118.84275 2.444 0.10 1 0.34 2F.1 tech 3D gE usgs LVC
72431220 2015/04/20 00:25:30.630 37.04033 -118.38254 12.467 2.30 2 0.09 3F.1 tech 3D gE usgs
72431700 2015/04/20 22:00:31.590 35.59215 -120.85964 0.323 0.90 2 0.36 0A.1 tech 3D gE usgs
72431695 2015/04/20 21:56:51.310 38.76478 -122.71692 2.153 0.70 1 0.57 0A.1 tech 3D gE usgs GGF
72431690 2015/04/20 21:49:49.120 38.83196 -122.78343 0.901 1.00 1 0.23 0A.1 tech 3D gE usgs GGF
72430640 2015/04/19 01:34:32.690 38.74743 -122.69347 3.270 0.70 1 1.17 2F.1 tech 3D gE usgs GGF


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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.