REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Fri Sep 21 19:53:25 UTC 2018    [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
2016: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2017: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2018: 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: 1
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
73087806 2018/09/21 19:45:12.780 38.82575 -122.78072 2.367 1.10 2 1.36 0A.1 tech 3D gE usgs GGF
73087791 2018/09/21 19:24:50.640 39.80080 -122.08420 4.630 1.50 - - 0A.0 tech 3D gE usgs
73087786 2018/09/21 19:04:9.600 38.80553 -122.78280 0.010 1.10 2 1.62 0A.1 tech 3D gE usgs GGF
73087771 2018/09/21 18:11:6.580 36.89308 -121.60619 2.434 1.60 1 0.96 0A.1 tech 3D gE usgs
73087766 2018/09/21 18:06:45.640 38.80551 -122.79478 1.630 0.00 2 0.88 0A.1 tech 3D gE usgs GGF
73087756 2018/09/21 17:35:23.920 38.83935 -122.83102 2.702 0.60 2 0.88 0A.1 tech 3D gE usgs GGF
73087751 2018/09/21 17:00:44.390 36.76770 -121.77950 2.140 1.90 - - 0A.0 tech 3D gE usgs
73087741 2018/09/21 16:42:18.410 37.07449 -121.15997 9.172 1.20 2 1.14 4F.1 tech 3D gE usgs
73087736 2018/09/21 16:32:19.640 36.92510 -121.32463 8.516 1.10 1 0.77 2F.1 tech 3D gE usgs
73087731 2018/09/21 16:31:46.110 38.83682 -122.82773 1.918 0.60 2 0.62 2F.1 tech 3D gE usgs GGF
73087726 2018/09/21 15:56:48.610 36.55402 -121.12418 8.800 1.80 1 0.32 2F.1 tech 3D gE usgs
73087721 2018/09/21 14:56:12.110 37.65898 -118.94253 3.245 0.30 1 2.36 2F.1 tech 3D gE usgs LVC
73087716 2018/09/21 14:35:38.570 40.43535 -121.98155 12.144 1.70 2 1.83 2F.1 tech 3D gE usgs
73087706 2018/09/21 14:09:19.380 37.62863 -118.87134 7.965 0.40 1 2.88 4F.1 tech 3D gE usgs LVC
73087696 2018/09/21 12:41:46.560 38.87859 -122.81579 4.682 0.60 2 5.84 0A.1 tech 3D gE usgs GGF
73087691 2018/09/21 12:12:0.690 37.45023 -118.80956 17.332 1.00 2 2.44 4F.1 tech 3D gE usgs LVC
73087686 2018/09/21 11:03:23.970 38.80294 -122.82593 2.683 0.00 2 0.47 0A.1 tech 3D gE usgs GGF
73087681 2018/09/21 10:51:28.360 37.65844 -118.94335 3.083 0.20 2 1.81 2F.1 tech 3D gE usgs LVC
73087676 2018/09/21 10:39:29.450 40.38550 -124.40030 11.830 0.00 - - 0A.0 tech 3D gE usgs MTJ
73087661 2018/09/21 09:54:9.060 37.63732 -118.91629 8.658 0.70 2 2.52 2F.1 tech 3D gE usgs LVC

Events last re/processed:
73087736 2018/09/21 16:32:19.640 36.92510 -121.32463 8.516 1.10 1 0.77 2F.1 tech 3D gE usgs
73087806 2018/09/21 19:45:12.780 38.82575 -122.78072 2.367 1.10 2 1.36 0A.1 tech 3D gE usgs GGF
73087566 2018/09/21 02:13:59.230 38.48430 -122.71745 5.665 2.30 1 1.27 4F.1 tech 3D gE usgs
73087791 2018/09/21 19:24:50.640 39.80080 -122.08420 4.630 1.50 - - 0A.0 tech 3D gE usgs
73087566 2018/09/21 02:13:59.230 38.48430 -122.71745 5.665 2.30 1 1.27 4F.1 tech 3D gE usgs
73087786 2018/09/21 19:04:9.600 38.80553 -122.78280 0.010 1.10 2 1.62 0A.1 tech 3D gE usgs GGF
73087741 2018/09/21 16:42:18.410 37.07449 -121.15997 9.172 1.20 2 1.14 4F.1 tech 3D gE usgs
73087741 2018/09/21 16:42:18.410 37.07449 -121.15997 9.172 1.20 2 1.14 2F.1 tech 3D gE usgs
73087731 2018/09/21 16:31:46.110 38.83682 -122.82773 1.918 0.60 2 0.62 2F.1 tech 3D gE usgs GGF
73087726 2018/09/21 15:56:48.610 36.55402 -121.12418 8.800 1.80 1 0.32 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.