REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Wed Oct 18 07:24:32 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
72910806 2017/10/18 07:05:50.610 38.37754 -122.64019 2.004 2.70 2 4.15 1A.1 tech 3D gE usgs
72910791 2017/10/18 06:20:15.750 37.66223 -118.85696 6.957 0.90 2 2.73 0A.1 tech 3D gE usgs LVC
72910786 2017/10/18 06:17:39.270 37.66141 -118.85575 6.921 0.90 1 2.13 0A.1 tech 3D gE usgs LVC
72910781 2017/10/18 06:16:38.840 37.66185 -118.85593 6.948 1.40 2 1.80 0A.1 tech 3D gE usgs LVC
72910771 2017/10/18 06:03:27.560 37.65919 -118.85620 6.805 1.10 1 2.02 0A.1 tech 3D gE usgs LVC
72910756 2017/10/18 05:41:16.390 39.27488 -122.75413 9.553 2.40 1 6.01 1A.1 tech 3D gE usgs
72910751 2017/10/18 05:37:10.480 38.80900 -122.79603 4.578 0.80 2 1.67 0A.1 tech 3D gE usgs GGF
72910736 2017/10/18 05:31:43.990 39.46080 -122.02820 41.130 2.30 - - 0A.0 tech 3D gE usgs
72910721 2017/10/18 05:04:20.260 37.66395 -118.85788 6.098 0.90 2 2.31 0A.1 tech 3D gE usgs LVC
72910696 2017/10/18 04:33:22.380 37.66537 -118.86922 3.744 0.90 2 1.54 0A.1 tech 3D gE usgs LVC
72910681 2017/10/18 04:25:44.720 37.64800 -118.84580 8.480 1.20 - - 0A.0 tech 3D gE usgs LVC
72910676 2017/10/18 04:23:41.080 37.65675 -118.85140 7.837 1.10 1 3.18 0A.1 tech 3D gE usgs LVC
72910671 2017/10/18 04:23:17.560 37.66038 -118.85617 6.888 1.20 1 2.00 0A.1 tech 3D gE usgs LVC
72910666 2017/10/18 04:22:31.420 37.66049 -118.85603 6.897 1.50 2 1.89 0A.1 tech 3D gE usgs LVC
72910661 2017/10/18 04:19:37.190 37.65720 -118.85970 1.520 0.70 - - 0A.0 tech 3D gE usgs LVC
72910651 2017/10/18 03:39:53.270 38.74168 -122.69626 2.606 0.80 1 2.01 0A.1 tech 3D gE usgs GGF
72910646 2017/10/18 03:34:53.130 37.66310 -118.86086 5.511 0.90 2 1.57 0A.1 tech 3D gE usgs LVC
72910641 2017/10/18 03:32:50.300 38.79256 -122.75710 2.201 1.60 2 1.57 0A.1 tech 3D gE usgs GGF
72910636 2017/10/18 02:25:52.420 37.65977 -118.85883 6.796 0.90 2 2.67 0A.1 tech 3D gE usgs LVC
72910631 2017/10/18 02:17:32.030 37.66459 -118.85845 7.745 -0.20 2 4.53 2F.1 tech 3D gE usgs LVC

Events last re/processed:
72910806 2017/10/18 07:05:50.610 38.37754 -122.64019 2.004 2.70 2 4.15 1A.1 tech 3D gE usgs
72910791 2017/10/18 06:20:15.750 37.66223 -118.85696 6.957 0.90 2 2.73 0A.1 tech 3D gE usgs LVC
72910786 2017/10/18 06:17:39.270 37.66141 -118.85575 6.921 0.90 1 2.13 0A.1 tech 3D gE usgs LVC
72910781 2017/10/18 06:16:38.840 37.66185 -118.85593 6.948 1.40 2 1.80 0A.1 tech 3D gE usgs LVC
72910771 2017/10/18 06:03:27.560 37.65919 -118.85620 6.805 1.10 1 2.02 0A.1 tech 3D gE usgs LVC
72910756 2017/10/18 05:41:16.390 39.27488 -122.75413 9.553 2.40 1 6.01 1A.1 tech 3D gE usgs
72910751 2017/10/18 05:37:10.480 38.80900 -122.79603 4.578 0.80 2 1.67 0A.1 tech 3D gE usgs GGF
72910736 2017/10/18 05:31:43.990 39.46080 -122.02820 41.130 2.30 - - 0A.0 tech 3D gE usgs
72908191 2017/10/13 05:52:59.720 37.46342 -118.79785 1.254 1.60 1 0.64 2F.1 tech 3D gE usgs LVC
72910721 2017/10/18 05:04:20.260 37.66395 -118.85788 6.098 0.90 2 2.31 0A.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.