REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Tue Oct 21 10:11:51 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: 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
72331111 2014/10/21 10:06:59.000 35.94300 -119.79400 5.000 2.20 - - 0A.0 tech 3D gE usgs
72331106 2014/10/21 09:35:38.640 38.82049 -122.79923 3.297 0.90 1 0.52 0A.1 tech 3D gE usgs GGF
72331101 2014/10/21 09:29:13.540 37.65867 -118.85788 3.875 1.10 2 2.24 0A.1 tech 3D gE usgs LVC
72331096 2014/10/21 09:28:59.600 40.24730 -124.19080 12.670 1.70 - - 0A.0 tech 3D gE usgs MTJ
72331091 2014/10/21 09:25:39.390 38.80953 -122.79002 3.472 0.60 2 0.35 0A.1 tech 3D gE usgs GGF
72331066 2014/10/21 08:46:17.700 36.00130 -120.56500 1.700 0.00 - - 0A.0 tech 3D gE usgs
72331061 2014/10/21 08:28:44.800 39.01750 -122.66170 9.260 0.00 - - 0A.0 tech 3D gE usgs
72331051 2014/10/21 08:14:40.700 38.76049 -122.71722 2.458 0.80 1 0.28 0A.1 tech 3D gE usgs GGF
72331046 2014/10/21 07:57:27.000 37.29320 -118.51800 40.190 1.60 - - 0A.0 tech 3D gE usgs
72331041 2014/10/21 07:26:21.070 38.75143 -122.70006 3.305 0.60 1 1.15 0A.1 tech 3D gE usgs GGF
72331031 2014/10/21 06:28:17.000 37.58580 -118.89200 0.030 0.60 - - 0A.0 tech 3D gE usgs LVC
72331026 2014/10/21 06:28:11.480 37.47231 -118.78495 6.403 1.10 1 0.53 0A.1 tech 3D gE usgs LVC
72331011 2014/10/21 06:11:31.670 37.47281 -118.78824 5.770 2.30 1 0.27 1A.1 tech 3D gE usgs LVC
72331006 2014/10/21 06:10:32.160 37.47467 -118.78724 6.818 3.00 1 0.49 1A.1 tech 3D gE usgs LVC
72331016 2014/10/21 06:10:24.730 36.77994 -121.47581 4.260 0.70 2 0.85 0A.1 tech 3D gE usgs
72330996 2014/10/21 05:34:21.100 35.98920 -120.54680 3.580 0.20 - - 0A.0 tech 3D gE usgs
72330991 2014/10/21 05:30:5.160 38.83129 -122.77337 4.409 0.80 2 0.94 0A.1 tech 3D gE usgs GGF
72330986 2014/10/21 05:14:32.900 38.82923 -122.78058 2.082 1.20 1 0.42 0A.1 tech 3D gE usgs GGF
72330981 2014/10/21 05:06:26.070 38.73706 -122.68656 8.417 0.50 2 0.84 0A.1 tech 3D gE usgs GGF
72330976 2014/10/21 04:33:17.440 38.82811 -122.85303 2.262 1.10 1 0.26 0A.1 tech 3D gE usgs GGF

Events last re/processed:
72331111 2014/10/21 10:06:59.000 35.94300 -119.79400 5.000 2.20 - - 0A.0 tech 3D gE usgs
72331106 2014/10/21 09:35:38.640 38.82049 -122.79923 3.297 0.90 1 0.52 0A.1 tech 3D gE usgs GGF
72331101 2014/10/21 09:29:13.540 37.65867 -118.85788 3.875 1.10 2 2.24 0A.1 tech 3D gE usgs LVC
72331096 2014/10/21 09:28:59.600 40.24730 -124.19080 12.670 1.70 - - 0A.0 tech 3D gE usgs MTJ
72331091 2014/10/21 09:25:39.390 38.80953 -122.79002 3.472 0.60 2 0.35 0A.1 tech 3D gE usgs GGF
72331066 2014/10/21 08:46:17.700 36.00130 -120.56500 1.700 0.00 - - 0A.0 tech 3D gE usgs
72331061 2014/10/21 08:28:44.800 39.01750 -122.66170 9.260 0.00 - - 0A.0 tech 3D gE usgs
72331051 2014/10/21 08:14:40.700 38.76049 -122.71722 2.458 0.80 1 0.28 0A.1 tech 3D gE usgs GGF
72331046 2014/10/21 07:57:27.000 37.29320 -118.51800 40.190 1.60 - - 0A.0 tech 3D gE usgs
72331041 2014/10/21 07:26:21.070 38.75143 -122.70006 3.305 0.60 1 1.15 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.