REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Mon Aug 8 03:26:19 UTC 2022    [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:
2021-07-08 M6.0 SmithValley
2020-08-19 M4.0 Willits
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
2019: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2020: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2021: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2022: 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
73765315 2022/08/08 02:38:51.040 36.67185 -121.06824 10.484 3.40 1 2.82 2A.1 tech 3D gE usgs
73765310 2022/08/08 02:26:24.920 38.81336 -122.80588 3.100 1.10 1 0.91 0A.1 tech 3D gE usgs GGF
73765305 2022/08/08 02:02:39.960 38.83868 -122.79106 2.806 0.50 1 0.98 0A.1 tech 3D gE usgs GGF
73765265 2022/08/08 00:19:11.280 38.78348 -122.73300 3.647 0.80 2 1.29 0A.1 tech 3D gE usgs GGF
73765260 2022/08/07 23:33:51.110 36.58270 -121.17835 4.195 1.50 1 0.86 0A.1 tech 3D gE usgs
73765245 2022/08/07 22:05:18.310 38.83381 -122.79105 2.665 1.10 2 0.92 0A.1 tech 3D gE usgs GGF
73765240 2022/08/07 21:47:6.400 36.08730 -120.19030 5.430 1.20 - - 0A.0 tech 3D gE usgs
73765235 2022/08/07 20:54:31.690 38.81580 -122.81792 3.709 0.80 1 0.93 0A.1 tech 3D gE usgs GGF
73765220 2022/08/07 19:42:17.880 38.92125 -122.89544 4.007 1.40 1 1.63 0A.1 tech 3D gE usgs
73765195 2022/08/07 18:19:34.210 38.82554 -122.80969 3.002 0.90 2 0.56 0A.1 tech 3D gE usgs GGF
73765190 2022/08/07 17:10:14.420 38.77958 -122.74045 0.010 0.20 1 0.02 0A.1 tech 3D gE usgs GGF
73765185 2022/08/07 16:58:7.460 36.01680 -120.57850 1.250 1.10 - - 0A.0 tech 3D gE usgs
73765170 2022/08/07 16:14:26.480 38.83861 -122.82779 1.908 0.90 1 0.66 0A.1 tech 3D gE usgs GGF
73765165 2022/08/07 16:04:51.660 38.83918 -122.82712 1.858 1.20 2 0.49 0A.1 tech 3D gE usgs GGF
73765160 2022/08/07 15:27:50.730 38.81483 -122.81982 1.874 0.50 1 0.65 0A.1 tech 3D gE usgs GGF
73765155 2022/08/07 15:21:40.700 38.68680 -122.34270 4.080 0.50 - - 3F.0 tech 3D gE usgs
73765150 2022/08/07 14:58:59.380 38.81515 -122.81959 1.826 0.90 2 0.75 0A.1 tech 3D gE usgs GGF
73765145 2022/08/07 14:51:50.270 38.81405 -122.81942 1.975 0.90 1 0.59 0A.1 tech 3D gE usgs GGF
73765140 2022/08/07 14:50:45.510 38.81451 -122.81944 2.080 1.80 1 0.96 0A.1 tech 3D gE usgs GGF
73765135 2022/08/07 14:45:29.070 37.69770 -122.06180 0.860 0.00 - - 0A.0 tech 3D gE usgs

Events last re/processed:
73765315 2022/08/08 02:38:51.040 36.67185 -121.06824 10.484 3.40 1 2.82 2A.1 tech 3D gE usgs
73765310 2022/08/08 02:26:24.920 38.81336 -122.80588 3.100 1.10 1 0.91 0A.1 tech 3D gE usgs GGF
73765305 2022/08/08 02:02:39.960 38.83868 -122.79106 2.806 0.50 1 0.98 0A.1 tech 3D gE usgs GGF
73765265 2022/08/08 00:19:11.280 38.78348 -122.73300 3.647 0.80 2 1.29 0A.1 tech 3D gE usgs GGF
73765260 2022/08/07 23:33:51.110 36.58270 -121.17835 4.195 1.50 1 0.86 0A.1 tech 3D gE usgs
73765245 2022/08/07 22:05:18.310 38.83381 -122.79105 2.665 1.10 2 0.92 0A.1 tech 3D gE usgs GGF
73765240 2022/08/07 21:47:6.400 36.08730 -120.19030 5.430 1.20 - - 0A.0 tech 3D gE usgs
73765235 2022/08/07 20:54:31.690 38.81580 -122.81792 3.709 0.80 1 0.93 0A.1 tech 3D gE usgs GGF
73765220 2022/08/07 19:42:17.880 38.92125 -122.89544 4.007 1.40 1 1.63 0A.1 tech 3D gE usgs
73765130 2022/08/07 14:32:1.590 38.59672 -122.36907 4.162 1.30 1 1.70 3F.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.