REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Fri Dec 15 11:42:55 UTC 2017    [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

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
72940336 2017/12/15 11:19:46.900 38.82528 -122.83355 13.883 0.80 2 0.62 0A.1 tech 3D gE usgs GGF
72940331 2017/12/15 10:54:11.740 38.78748 -122.75190 1.084 0.90 1 1.10 0A.1 tech 3D gE usgs GGF
72940316 2017/12/15 10:35:20.720 39.17750 -121.76050 111.660 3.10 - - 0A.0 tech 3D gE usgs
72940311 2017/12/15 10:35:17.110 37.08620 -120.89880 2.160 1.60 - - 0A.0 tech 3D gE usgs
72940301 2017/12/15 10:05:36.260 39.93070 -123.88500 3.740 0.00 - - 0A.0 tech 3D gE usgs
72940296 2017/12/15 09:45:38.090 37.54261 -118.82730 2.144 1.00 2 2.14 0A.1 tech 3D gE usgs LVC
72940291 2017/12/15 09:36:43.930 38.82281 -122.76282 2.635 0.90 1 1.28 0A.1 tech 3D gE usgs GGF
72940281 2017/12/15 09:28:22.550 37.44036 -118.72887 14.935 1.70 2 2.92 0A.1 tech 3D gE usgs LVC
72940276 2017/12/15 09:28:10.320 37.41383 -118.73086 2.914 1.40 2 0.28 0A.1 tech 3D gE usgs LVC
72940266 2017/12/15 09:13:28.720 38.82747 -122.80242 3.728 1.10 2 1.62 0A.1 tech 3D gE usgs GGF
72940261 2017/12/15 09:03:35.050 38.81778 -122.81663 2.867 0.90 2 0.75 0A.1 tech 3D gE usgs GGF
72940251 2017/12/15 08:48:14.390 35.98906 -120.54768 4.201 0.90 1 0.85 0A.1 tech 3D gE usgs PKF
72940246 2017/12/15 08:35:25.140 36.56043 -121.15483 8.472 0.80 1 0.53 0A.1 tech 3D gE usgs
72940241 2017/12/15 08:34:15.390 38.38930 -121.82080 16.950 0.00 - - 0A.0 tech 3D gE usgs
72940231 2017/12/15 08:24:5.490 36.56361 -121.14788 9.302 3.30 2 0.72 3A.1 tech 3D gE usgs
72940236 2017/12/15 08:23:57.460 37.44109 -118.72813 14.967 1.60 1 2.65 0A.1 tech 3D gE usgs LVC
72940226 2017/12/15 08:04:15.170 38.78415 -122.75991 1.355 0.50 2 1.51 0A.1 tech 3D gE usgs GGF
72940216 2017/12/15 07:59:34.970 37.53068 -118.98451 2.439 1.70 2 0.61 0A.1 tech 3D gE usgs LVC
72940211 2017/12/15 07:57:49.270 39.48520 -121.97350 49.800 2.30 - - 0A.0 tech 3D gE usgs
72940206 2017/12/15 07:55:6.810 39.54280 -121.94220 30.040 2.00 - - 0A.0 tech 3D gE usgs

Events last re/processed:
72940336 2017/12/15 11:19:46.900 38.82528 -122.83355 13.883 0.80 2 0.62 0A.1 tech 3D gE usgs GGF
72940331 2017/12/15 10:54:11.740 38.78748 -122.75190 1.084 0.90 1 1.10 0A.1 tech 3D gE usgs GGF
72940316 2017/12/15 10:35:20.720 39.17750 -121.76050 111.660 3.10 - - 0A.0 tech 3D gE usgs
72940311 2017/12/15 10:35:17.110 37.08620 -120.89880 2.160 1.60 - - 0A.0 tech 3D gE usgs
72940301 2017/12/15 10:05:36.260 39.93070 -123.88500 3.740 0.00 - - 0A.0 tech 3D gE usgs
72940296 2017/12/15 09:45:38.090 37.54261 -118.82730 2.144 1.00 2 2.14 0A.1 tech 3D gE usgs LVC
72940291 2017/12/15 09:36:43.930 38.82281 -122.76282 2.635 0.90 1 1.28 0A.1 tech 3D gE usgs GGF
72940281 2017/12/15 09:28:22.550 37.44036 -118.72887 14.935 1.70 2 2.92 0A.1 tech 3D gE usgs LVC
72940276 2017/12/15 09:28:10.320 37.41383 -118.73086 2.914 1.40 2 0.28 0A.1 tech 3D gE usgs LVC
72940266 2017/12/15 09:13:28.720 38.82747 -122.80242 3.728 1.10 2 1.62 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.