REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Tue Jul 17 13:13:08 UTC 2018    [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
2018: 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
73048121 2018/07/17 11:58:58.980 38.82129 -122.89697 4.487 0.60 2 1.67 0A.1 tech 3D gE usgs GGF
73048101 2018/07/17 11:15:34.210 38.81364 -122.81429 3.720 0.00 2 1.14 0A.1 tech 3D gE usgs GGF
73048096 2018/07/17 11:05:45.340 37.71399 -122.10187 4.959 1.70 1 0.35 1A.1 tech 3D gE usgs HAY
73048056 2018/07/17 10:08:3.150 39.57333 -121.98523 9.841 1.10 2 1.17 0A.1 tech 3D gE usgs
73048041 2018/07/17 09:21:6.050 38.78970 -122.76215 4.167 1.40 2 1.35 0A.1 tech 3D gE usgs GGF
73048026 2018/07/17 08:59:31.670 38.81711 -122.80052 3.339 0.80 2 1.09 0A.1 tech 3D gE usgs GGF
73048021 2018/07/17 08:50:14.630 39.82130 -121.90530 1.570 2.00 - - 0A.0 tech 3D gE usgs
73047956 2018/07/17 07:44:27.230 39.74230 -122.01200 74.450 0.00 - - 0A.0 tech 3D gE usgs
73047921 2018/07/17 07:15:29.430 39.49935 -122.13863 2.177 1.50 2 0.62 0A.1 tech 3D gE usgs
73047911 2018/07/17 07:13:14.080 39.46839 -122.08255 0.012 0.00 2 1.11 0A.1 tech 3D gE usgs
73047896 2018/07/17 07:01:49.730 38.96082 -122.77977 9.098 0.00 2 0.22 0A.1 tech 3D gE usgs
73047871 2018/07/17 06:44:13.260 37.13459 -121.53409 7.719 1.10 2 0.53 0A.1 tech 3D gE usgs CAL
73047846 2018/07/17 06:09:56.710 38.82240 -122.79486 3.820 1.10 1 1.10 0A.1 tech 3D gE usgs GGF
73047841 2018/07/17 06:02:35.730 37.62681 -119.00282 0.994 0.80 2 5.01 0A.1 tech 3D gE usgs LVC
73047836 2018/07/17 06:02:23.830 37.44300 -119.15150 15.880 1.80 - - 0A.0 tech 3D gE usgs
73047811 2018/07/17 05:30:24.000 38.40249 -122.41943 8.003 1.40 1 0.61 0A.1 tech 3D gE usgs
73047806 2018/07/17 05:24:10.170 38.84086 -122.82664 2.788 0.90 2 0.62 0A.1 tech 3D gE usgs GGF
73047796 2018/07/17 05:20:32.180 38.81014 -122.82618 2.866 1.40 2 1.30 0A.1 tech 3D gE usgs GGF
73047781 2018/07/17 05:13:20.500 39.56644 -121.93092 4.887 1.80 2 1.07 0A.1 tech 3D gE usgs
73047771 2018/07/17 05:06:6.610 38.82675 -122.85585 2.482 1.00 2 0.60 0A.1 tech 3D gE usgs GGF

Events last re/processed:
73048121 2018/07/17 11:58:58.980 38.82129 -122.89697 4.487 0.60 2 1.67 0A.1 tech 3D gE usgs GGF
73048101 2018/07/17 11:15:34.210 38.81364 -122.81429 3.720 0.00 2 1.14 0A.1 tech 3D gE usgs GGF
73048096 2018/07/17 11:05:45.340 37.71399 -122.10187 4.959 1.70 1 0.35 1A.1 tech 3D gE usgs HAY
73048056 2018/07/17 10:08:3.150 39.57333 -121.98523 9.841 1.10 2 1.17 0A.1 tech 3D gE usgs
73048041 2018/07/17 09:21:6.050 38.78970 -122.76215 4.167 1.40 2 1.35 0A.1 tech 3D gE usgs GGF
73048026 2018/07/17 08:59:31.670 38.81711 -122.80052 3.339 0.80 2 1.09 0A.1 tech 3D gE usgs GGF
73048021 2018/07/17 08:50:14.630 39.82130 -121.90530 1.570 2.00 - - 0A.0 tech 3D gE usgs
73047956 2018/07/17 07:44:27.230 39.74230 -122.01200 74.450 0.00 - - 0A.0 tech 3D gE usgs
73047921 2018/07/17 07:15:29.430 39.49935 -122.13863 2.177 1.50 2 0.62 0A.1 tech 3D gE usgs
73045956 2018/07/14 20:28:6.310 40.85950 -125.37700 25.530 2.90 - - 9F.0 tech 3D gE usgs MTJ


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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.