REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Wed Jan 28 14:01:44 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
72387686 2015/01/28 13:09:18.300 38.83952 -122.80474 2.603 0.20 2 0.26 0A.1 tech 3D gE usgs GGF
72387676 2015/01/28 13:01:35.230 37.65618 -118.85036 4.459 1.30 1 0.91 0A.1 tech 3D gE usgs LVC
72387656 2015/01/28 12:37:1.460 37.64927 -118.84980 5.075 1.00 2 1.90 0A.1 tech 3D gE usgs LVC
72387651 2015/01/28 11:54:38.690 38.78487 -122.73555 2.242 1.00 2 0.38 0A.1 tech 3D gE usgs GGF
72387641 2015/01/28 11:32:50.020 38.79375 -122.75922 1.773 1.60 1 0.12 0A.1 tech 3D gE usgs GGF
72387636 2015/01/28 11:24:0.820 35.97952 -120.53628 3.775 0.70 2 0.57 0A.1 tech 3D gE usgs PKF
72387631 2015/01/28 11:17:25.780 35.98828 -120.54926 4.847 0.80 2 1.73 0A.1 tech 3D gE usgs PKF
72387626 2015/01/28 10:55:59.470 38.82749 -122.78014 2.185 0.60 1 0.34 0A.1 tech 3D gE usgs GGF
72387621 2015/01/28 10:55:14.400 38.75512 -122.72904 2.341 0.90 1 0.51 0A.1 tech 3D gE usgs GGF
72387606 2015/01/28 09:16:19.280 38.80523 -122.77157 2.465 0.50 1 0.30 0A.1 tech 3D gE usgs GGF
72387601 2015/01/28 08:56:59.700 38.84411 -122.84250 2.306 1.20 2 0.28 0A.1 tech 3D gE usgs GGF
72387596 2015/01/28 08:56:34.990 38.80874 -122.81400 4.050 0.80 1 1.26 0A.1 tech 3D gE usgs GGF
72387586 2015/01/28 08:27:2.850 38.82164 -122.79208 3.816 0.90 1 0.56 1A.1 tech 3D gE usgs GGF
72387581 2015/01/28 08:24:53.440 38.97439 -123.04743 4.600 1.90 1 0.32 0A.1 tech 3D gE usgs
72387576 2015/01/28 08:01:45.300 33.64130 -116.67970 10.540 1.90 - - 0A.0 tech 3D gE usgs
72387571 2015/01/28 07:23:0.020 36.48950 -121.06524 4.646 1.40 1 0.37 0A.1 tech 3D gE usgs
72387561 2015/01/28 06:36:45.100 38.37430 -118.10300 0.040 2.50 - - 1A.0 tech 3D gE usgs
72387556 2015/01/28 06:35:48.300 38.37550 -118.11350 0.000 2.50 - - 1A.0 tech 3D gE usgs
72387551 2015/01/28 06:33:40.470 38.81537 -122.81129 2.974 0.90 2 0.34 0A.1 tech 3D gE usgs GGF
72387546 2015/01/28 06:33:26.760 38.80925 -122.81369 4.336 0.40 1 1.95 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72387686 2015/01/28 13:09:18.300 38.83952 -122.80474 2.603 0.20 2 0.26 0A.1 tech 3D gE usgs GGF
72387676 2015/01/28 13:01:35.230 37.65618 -118.85036 4.459 1.30 1 0.91 0A.1 tech 3D gE usgs LVC
72387656 2015/01/28 12:37:1.460 37.64927 -118.84980 5.075 1.00 2 1.90 0A.1 tech 3D gE usgs LVC
72387651 2015/01/28 11:54:38.690 38.78487 -122.73555 2.242 1.00 2 0.38 0A.1 tech 3D gE usgs GGF
72387641 2015/01/28 11:32:50.020 38.79375 -122.75922 1.773 1.60 1 0.12 0A.1 tech 3D gE usgs GGF
72387636 2015/01/28 11:24:0.820 35.97952 -120.53628 3.775 0.70 2 0.57 0A.1 tech 3D gE usgs PKF
72387631 2015/01/28 11:17:25.780 35.98828 -120.54926 4.847 0.80 2 1.73 0A.1 tech 3D gE usgs PKF
72387626 2015/01/28 10:55:59.470 38.82749 -122.78014 2.185 0.60 1 0.34 0A.1 tech 3D gE usgs GGF
72387621 2015/01/28 10:55:14.400 38.75512 -122.72904 2.341 0.90 1 0.51 0A.1 tech 3D gE usgs GGF
72387606 2015/01/28 09:16:19.280 38.80523 -122.77157 2.465 0.50 1 0.30 0A.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.