REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Tue Mar 19 03:24:55 UTC 2024    [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 5 minutes.

Faults of special interest:
Hayward Fault | Calaveras Fault | Parkfield

Earthquakes of special interest:
2023-08-10 M4.3 Parkfield
2022-10-25 M5.0 Calaveras
2021-07-08 M6.0 SmithValley
2020-08-19 M4.0 Willits
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
2019: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2020: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2021: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2022: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2023: Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2024: 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: 1
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
74019751 2024/03/19 03:15:21.070 38.79444 -122.75662 0.980 1.10 2 2.09 0A.1 tech 3D gE usgs GGF
74019746 2024/03/19 03:14:53.270 37.55150 -118.82327 10.328 1.00 2 1.78 0A.1 tech 3D gE usgs LVC
74019741 2024/03/19 03:00:30.630 38.74102 -122.90724 19.890 1.40 2 0.00 0A.1 tech 3D gE usgs
74019731 2024/03/19 02:54:50.600 38.79545 -122.75754 0.019 0.80 1 0.07 0A.1 tech 3D gE usgs GGF
74019726 2024/03/19 02:43:31.070 38.80765 -122.81249 2.690 1.00 2 0.79 0A.1 tech 3D gE usgs GGF
74019721 2024/03/19 02:31:40.870 35.85766 -121.29447 2.833 2.10 2 0.61 0A.1 tech 3D gE usgs
74019716 2024/03/19 02:23:24.570 40.37380 -125.39500 2.280 3.80 - - 2A.0 tech 3D gE usgs MTJ
74019711 2024/03/19 01:59:46.280 38.80396 -122.76517 2.303 0.70 1 0.60 0A.1 tech 3D gE usgs GGF
74019706 2024/03/19 01:51:19.060 38.79935 -122.80947 2.600 0.80 1 0.22 0A.1 tech 3D gE usgs GGF
74019696 2024/03/19 01:18:6.020 38.83621 -122.80653 3.163 1.00 2 0.96 0A.1 tech 3D gE usgs GGF
74019681 2024/03/19 00:58:56.820 38.81303 -122.82812 2.739 1.10 1 0.87 0A.1 tech 3D gE usgs GGF
74019676 2024/03/19 00:58:31.790 38.81217 -122.82752 2.854 1.10 2 1.00 0A.1 tech 3D gE usgs GGF
74019666 2024/03/19 00:53:45.210 36.98520 -120.23820 10.100 0.00 - - 0A.0 tech 3D gE usgs
74019661 2024/03/19 00:35:9.760 38.80011 -122.80861 2.661 0.90 2 0.70 0A.1 tech 3D gE usgs GGF
74019656 2024/03/19 00:32:41.060 38.79934 -122.81038 2.790 1.00 2 0.80 0A.1 tech 3D gE usgs GGF
74019641 2024/03/19 00:03:54.440 38.82431 -122.85726 2.645 0.30 2 0.60 0A.1 tech 3D gE usgs GGF
74019631 2024/03/18 23:57:53.160 36.59830 -121.27950 1.950 2.80 - - 0A.0 tech 3D gE usgs
74019636 2024/03/18 23:57:26.780 36.62631 -121.21840 5.299 3.40 2 4.69 2A.1 tech 3D gE usgs
74019616 2024/03/18 23:52:44.090 38.85674 -122.81929 0.499 0.30 2 2.72 0A.1 tech 3D gE usgs GGF
74019611 2024/03/18 23:51:50.040 38.81377 -122.81573 1.550 1.60 2 0.95 0A.1 tech 3D gE usgs GGF

Events last re/processed:
74019751 2024/03/19 03:15:21.070 38.79444 -122.75662 0.980 1.10 2 2.09 0A.1 tech 3D gE usgs GGF
74019746 2024/03/19 03:14:53.270 37.55150 -118.82327 10.328 1.00 2 1.78 0A.1 tech 3D gE usgs LVC
74019741 2024/03/19 03:00:30.630 38.74102 -122.90724 19.890 1.40 2 0.00 0A.1 tech 3D gE usgs
74019731 2024/03/19 02:54:50.600 38.79545 -122.75754 0.019 0.80 1 0.07 0A.1 tech 3D gE usgs GGF
74019726 2024/03/19 02:43:31.070 38.80765 -122.81249 2.690 1.00 2 0.79 0A.1 tech 3D gE usgs GGF
74019721 2024/03/19 02:31:40.870 35.85766 -121.29447 2.833 2.10 2 0.61 0A.1 tech 3D gE usgs
74019716 2024/03/19 02:23:24.570 40.37380 -125.39500 2.280 3.80 - - 2A.0 tech 3D gE usgs MTJ
74019711 2024/03/19 01:59:46.280 38.80396 -122.76517 2.303 0.70 1 0.60 0A.1 tech 3D gE usgs GGF
74019706 2024/03/19 01:51:19.060 38.79935 -122.80947 2.600 0.80 1 0.22 0A.1 tech 3D gE usgs GGF
74019696 2024/03/19 01:18:6.020 38.83621 -122.80653 3.163 1.00 2 0.96 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.