REAL-TIME DOUBLE-DIFFERENCE EARTHQUAKE LOCATIONS FOR NORTHERN CALIFORNIA


Last updated on Sat Apr 20 13:18:00 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: 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
74037921 2024/04/20 12:18:33.500 38.82509 -122.80632 3.277 0.90 1 1.35 0A.1 tech 3D gE usgs GGF
74037916 2024/04/20 12:11:13.520 39.50280 -123.14230 0.810 1.50 - - 0A.0 tech 3D gE usgs
74037906 2024/04/20 11:41:0.420 38.83951 -122.82341 2.196 0.30 2 0.68 0A.1 tech 3D gE usgs GGF
74037901 2024/04/20 11:36:38.260 38.81596 -122.81580 3.644 0.70 2 1.17 0A.1 tech 3D gE usgs GGF
74037896 2024/04/20 11:05:18.680 38.84444 -122.83897 2.449 0.40 2 0.58 0A.1 tech 3D gE usgs GGF
74037891 2024/04/20 11:03:22.590 38.82869 -122.79463 3.779 0.80 2 1.07 0A.1 tech 3D gE usgs GGF
74037886 2024/04/20 10:55:39.090 38.79274 -122.76672 5.035 0.60 2 1.47 0A.1 tech 3D gE usgs GGF
74037881 2024/04/20 10:53:45.760 38.81187 -122.82947 2.731 0.80 2 1.21 0A.1 tech 3D gE usgs GGF
74037876 2024/04/20 10:48:20.210 38.81085 -122.82903 3.049 0.80 2 1.02 0A.1 tech 3D gE usgs GGF
74037861 2024/04/20 10:05:47.920 38.81349 -122.82013 3.664 0.80 1 0.95 0A.1 tech 3D gE usgs GGF
74037856 2024/04/20 10:02:50.980 38.83691 -122.79068 2.471 0.80 1 0.71 0A.1 tech 3D gE usgs GGF
74037846 2024/04/20 09:46:35.930 38.83641 -122.78830 2.559 1.10 1 0.61 0A.1 tech 3D gE usgs GGF
74037841 2024/04/20 09:44:51.860 38.87464 -122.85265 15.530 0.80 2 0.60 0A.1 tech 3D gE usgs GGF
74037821 2024/04/20 08:32:32.900 38.82378 -122.82562 2.544 0.80 2 0.69 0A.1 tech 3D gE usgs GGF
74037816 2024/04/20 08:08:19.890 40.25600 -124.51700 20.180 0.00 - - 0A.0 tech 3D gE usgs MTJ
74037811 2024/04/20 07:57:45.690 40.08627 -123.68643 22.243 2.40 2 1.34 0A.1 tech 3D gE usgs
74037806 2024/04/20 07:47:49.160 38.13080 -121.83480 9.060 0.00 - - 0A.0 tech 3D gE usgs
74037801 2024/04/20 07:31:51.410 35.78606 -121.21698 8.394 1.40 2 0.26 0A.1 tech 3D gE usgs
74037781 2024/04/20 06:58:29.780 38.83124 -122.80122 2.972 1.10 2 0.93 0A.1 tech 3D gE usgs GGF
74037776 2024/04/20 06:49:29.350 38.83361 -122.77280 16.507 0.90 2 2.22 0A.1 tech 3D gE usgs GGF

Events last re/processed:
74037921 2024/04/20 12:18:33.500 38.82509 -122.80632 3.277 0.90 1 1.35 0A.1 tech 3D gE usgs GGF
74037916 2024/04/20 12:11:13.520 39.50280 -123.14230 0.810 1.50 - - 0A.0 tech 3D gE usgs
74037906 2024/04/20 11:41:0.420 38.83951 -122.82341 2.196 0.30 2 0.68 0A.1 tech 3D gE usgs GGF
74037901 2024/04/20 11:36:38.260 38.81596 -122.81580 3.644 0.70 2 1.17 0A.1 tech 3D gE usgs GGF
74037896 2024/04/20 11:05:18.680 38.84444 -122.83897 2.449 0.40 2 0.58 0A.1 tech 3D gE usgs GGF
74037891 2024/04/20 11:03:22.590 38.82869 -122.79463 3.779 0.80 2 1.07 0A.1 tech 3D gE usgs GGF
74037886 2024/04/20 10:55:39.090 38.79274 -122.76672 5.035 0.60 2 1.47 0A.1 tech 3D gE usgs GGF
74037881 2024/04/20 10:53:45.760 38.81187 -122.82947 2.731 0.80 2 1.21 0A.1 tech 3D gE usgs GGF
74037876 2024/04/20 10:48:20.210 38.81085 -122.82903 3.049 0.80 2 1.02 0A.1 tech 3D gE usgs GGF
74037861 2024/04/20 10:05:47.920 38.81349 -122.82013 3.664 0.80 1 0.95 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.