REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Fri Dec 19 17:26:04 UTC 2014    [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

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: 2
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
72366886 2014/12/19 17:11:25.410 38.80725 -122.86001 0.010 0.90 2 1.34 0A.1 tech 3D gE usgs GGF
72366881 2014/12/19 17:07:58.140 38.80111 -122.81630 3.314 0.90 1 0.27 0A.1 tech 3D gE usgs GGF
72366876 2014/12/19 16:54:23.690 38.79393 -122.75387 2.220 0.90 1 0.52 0A.1 tech 3D gE usgs GGF
72366871 2014/12/19 16:35:43.950 36.75975 -121.34242 7.067 1.10 1 0.90 0A.1 tech 3D gE usgs
72366851 2014/12/19 14:03:48.770 38.82097 -122.76553 2.778 2.40 2 0.45 1A.1 tech 3D gE usgs GGF
72366846 2014/12/19 13:55:6.300 38.84074 -122.78291 2.266 0.80 2 0.34 0A.1 tech 3D gE usgs GGF
72366821 2014/12/19 13:31:4.010 38.79084 -122.75601 2.290 0.90 2 0.43 0A.1 tech 3D gE usgs GGF
72366816 2014/12/19 12:45:12.540 37.38310 -118.54818 7.248 1.10 1 1.97 2F.1 tech 3D gE usgs LVC
72366811 2014/12/19 12:25:44.240 37.63872 -119.04014 0.038 -0.10 1 0.78 2F.1 tech 3D gE usgs LVC
72366806 2014/12/19 12:14:24.710 38.81869 -122.75977 2.253 0.90 1 0.65 0A.1 tech 3D gE usgs GGF
72366801 2014/12/19 11:44:45.320 38.78319 -122.72851 0.023 0.60 2 0.21 0A.1 tech 3D gE usgs GGF
72366796 2014/12/19 11:29:22.200 40.49530 -124.24000 23.470 1.40 - - 0A.0 tech 3D gE usgs MTJ
72366791 2014/12/19 11:23:24.090 38.80750 -122.80045 2.028 0.90 2 0.51 0A.1 tech 3D gE usgs GGF
72366786 2014/12/19 11:06:57.540 38.80972 -122.79795 4.406 0.70 1 0.64 0A.1 tech 3D gE usgs GGF
72366781 2014/12/19 11:03:26.290 38.76086 -122.72565 2.493 0.70 1 0.40 0A.1 tech 3D gE usgs GGF
72366776 2014/12/19 10:59:25.430 38.73518 -122.42883 4.927 1.70 1 3.04 0A.1 tech 3D gE usgs
72366771 2014/12/19 10:12:53.410 38.84524 -122.82765 1.930 0.90 2 0.22 0A.1 tech 3D gE usgs GGF
72366766 2014/12/19 10:03:37.840 38.81623 -122.73930 3.919 0.70 2 0.83 0A.1 tech 3D gE usgs GGF
72366761 2014/12/19 09:33:28.170 38.82117 -122.84552 2.445 0.90 1 0.26 0A.1 tech 3D gE usgs GGF
72366756 2014/12/19 08:04:51.160 38.83565 -122.87967 2.070 0.30 2 1.01 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72366816 2014/12/19 12:45:12.540 37.38310 -118.54818 7.248 1.10 1 1.97 2F.1 tech 3D gE usgs LVC
72366886 2014/12/19 17:11:25.410 38.80725 -122.86001 0.010 0.90 2 1.34 0A.1 tech 3D gE usgs GGF
72366881 2014/12/19 17:07:58.140 38.80111 -122.81630 3.314 0.90 1 0.27 0A.1 tech 3D gE usgs GGF
72366811 2014/12/19 12:25:44.240 37.63872 -119.04014 0.038 -0.10 1 0.78 2F.1 tech 3D gE usgs LVC
72366726 2014/12/19 06:12:2.350 37.41061 -118.59987 11.303 0.90 2 1.42 2F.1 tech 3D gE usgs LVC
72366876 2014/12/19 16:54:23.690 38.79393 -122.75387 2.220 0.90 1 0.52 0A.1 tech 3D gE usgs GGF
72366691 2014/12/19 03:00:35.960 37.64388 -118.97414 7.498 0.80 1 0.68 2F.1 tech 3D gE usgs LVC
72366871 2014/12/19 16:35:43.950 36.75975 -121.34242 7.067 1.10 1 0.90 0A.1 tech 3D gE usgs
72366566 2014/12/18 22:20:6.030 37.37259 -120.00377 26.163 1.60 1 3.15 2F.1 tech 3D gE usgs
72366556 2014/12/18 21:39:57.630 37.69255 -118.96753 2.510 0.40 1 0.70 2F.1 tech 3D gE usgs LVC


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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.