REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Mon Jun 26 15:32:40 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: 5
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
72821846 2017/06/26 15:02:41.820 37.55730 -118.83200 0.670 0.90 - - 0A.0 tech 3D gE usgs LVC
72821841 2017/06/26 15:00:34.350 37.55861 -118.82986 3.102 0.90 1 2.08 0A.1 tech 3D gE usgs LVC
72821836 2017/06/26 14:33:44.740 37.52002 -118.82030 1.019 1.60 1 1.03 0A.1 tech 3D gE usgs LVC
72821831 2017/06/26 14:28:17.700 38.77281 -122.71996 2.577 0.50 2 0.36 0A.1 tech 3D gE usgs GGF
72821826 2017/06/26 14:17:59.170 38.77723 -122.71672 2.693 0.90 1 1.01 0A.1 tech 3D gE usgs GGF
72821821 2017/06/26 14:16:7.920 38.77512 -122.71987 1.138 2.00 1 1.17 0A.1 tech 3D gE usgs GGF
72821816 2017/06/26 14:04:9.350 38.77581 -122.71723 2.468 0.90 1 0.67 0A.1 tech 3D gE usgs GGF
72821806 2017/06/26 13:44:49.240 38.79998 -122.73607 1.989 0.70 2 0.33 0A.1 tech 3D gE usgs GGF
72821801 2017/06/26 13:05:32.480 40.28889 -121.86309 10.425 1.90 2 1.19 0A.1 tech 3D gE usgs
72821776 2017/06/26 11:37:49.660 38.81047 -122.83322 9.443 0.00 2 0.14 0A.1 tech 3D gE usgs GGF
72821766 2017/06/26 09:54:53.150 38.83461 -122.78280 1.940 0.40 2 0.96 0A.1 tech 3D gE usgs GGF
72821756 2017/06/26 09:52:52.400 37.94630 -122.52870 0.420 0.00 - - 0A.0 tech 3D gE usgs
72821751 2017/06/26 09:38:41.680 38.82262 -122.81199 3.826 1.00 2 0.68 0A.1 tech 3D gE usgs GGF
72821746 2017/06/26 09:38:21.090 36.37082 -121.48760 7.850 2.50 2 0.49 1A.1 tech 3D gE usgs
72821736 2017/06/26 09:10:1.610 38.81561 -122.77227 0.061 0.90 2 1.81 0A.1 tech 3D gE usgs GGF
72821721 2017/06/26 08:41:59.840 37.60042 -122.36974 8.717 0.90 2 0.65 0A.1 tech 3D gE usgs
72821711 2017/06/26 07:36:59.090 38.35130 -122.69930 4.420 0.00 - - 0A.0 tech 3D gE usgs
72821706 2017/06/26 07:36:36.490 37.57050 -118.93538 1.045 1.10 2 1.21 0A.1 tech 3D gE usgs LVC
72821696 2017/06/26 06:59:56.500 37.59058 -118.95033 3.360 1.20 2 1.42 0A.1 tech 3D gE usgs LVC
72821691 2017/06/26 06:06:57.170 37.57734 -118.82228 2.731 1.10 2 2.73 0A.1 tech 3D gE usgs LVC

Events last re/processed:
72820326 2017/06/24 05:33:43.680 37.55411 -118.87377 7.346 0.20 2 2.18 2F.1 tech 3D gE usgs LVC
72820286 2017/06/24 03:43:2.320 37.57171 -118.83010 2.698 0.40 2 2.74 2F.1 tech 3D gE usgs LVC
72820266 2017/06/24 02:50:11.120 37.55150 -118.84200 -0.130 1.00 - - 2F.0 tech 3D gE usgs LVC
72821846 2017/06/26 15:02:41.820 37.55730 -118.83200 0.670 0.90 - - 0A.0 tech 3D gE usgs LVC
72821841 2017/06/26 15:00:34.350 37.55861 -118.82986 3.102 0.90 1 2.08 0A.1 tech 3D gE usgs LVC
72821836 2017/06/26 14:33:44.740 37.52002 -118.82030 1.019 1.60 1 1.03 0A.1 tech 3D gE usgs LVC
72821831 2017/06/26 14:28:17.700 38.77281 -122.71996 2.577 0.50 2 0.36 0A.1 tech 3D gE usgs GGF
72821826 2017/06/26 14:17:59.170 38.77723 -122.71672 2.693 0.90 1 1.01 0A.1 tech 3D gE usgs GGF
72821821 2017/06/26 14:16:7.920 38.77512 -122.71987 1.138 2.00 1 1.17 0A.1 tech 3D gE usgs GGF
72821816 2017/06/26 14:04:9.350 38.77581 -122.71723 2.468 0.90 1 0.67 0A.1 tech 3D gE usgs GGF


____________________________________________________________________________________________________
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.