Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Wed Jul 8 17:18:05 UTC 2026 ( Wed Jul 8 13:18:05 EDT 2026 )

IMPORTANT CHANGE NOTE:
This is a comprehensive update of the previous DD-RT system for Northern California. Main changes are: (1) New DD base catalog with events from 1984-2021. (2) All earthquake depths now with respect to geoid (consistent with USGS locations).

About:
This website displays double-difference hypocenter locations computed in real-time (DD-RT) for earthquakes recorded at the Northern California Seismic Network (NCSN). New earthquakes are automatically cross-correlated and relocated relative to a high-resolution base catalog (1984-2021). For more details see here. This site is updated every 5 minutes.

Faults of interest:
Hayward | Calaveras | SAF Parkfield

Earthquakes of interest:
2023-08-10 M4.3 Parkfield
2025-01-10 M3.6 San Francisco

Archived DDRT solutions:
2022: 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12
2023: 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12
2024: 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12
2025: 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12
2026: 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12

Downloads:
DD real-time catalog, Jan 2022 - present
DD base catalog, 1984-2021
Search either catalog here.

Most recent events (events in queue = 0):

Q: Solution quality DX: Shift between DD and network location (km); V: version (CISN.DD)
If Q='-': No DDRT solution computed.
tech: technical information; 3D: 3D viewer; waves: wave plots; USGS: USGS event page
Faults/regions of interest:
HAY = Hayward F; CAL = Calaveras F; PKF = Parkfield; LVC = Long Valley
GGF = Geysers Geothermal Field; MTJ = Mendocino Triple Junction

ID DATE TIME (UTC) LAT LON DEPTH ML Q DX V
75392096 2026/07/08 17:12:31.250 38.78062 -122.72055 1.560 1.00 1 0.17 0A.3 tech 3D waves usgs GGF
75392071 2026/07/08 16:37:12.880 37.52054 -121.81557 6.894 2.20 1 0.74 0A.3 tech 3D waves usgs CAL
75392066 2026/07/08 16:36:36.990 38.83599 -122.79856 2.300 0.70 2 0.14 0A.3 tech 3D waves usgs GGF
75392056 2026/07/08 16:02:22.680 38.75789 -122.72940 1.858 1.10 2 0.23 0A.3 tech 3D waves usgs GGF
75392026 2026/07/08 15:19:40.230 38.83870 -122.78293 2.228 0.60 2 0.61 0A.3 tech 3D waves usgs GGF
75391986 2026/07/08 13:43:56.150 38.80372 -122.76464 4.217 0.30 2 0.87 0A.3 tech 3D waves usgs GGF
75391981 2026/07/08 13:32:23.570 38.84315 -122.83380 8.281 0.40 2 0.64 0A.3 tech 3D waves usgs GGF
75391976 2026/07/08 13:27:54.500 37.60037 -122.47056 9.597 1.10 1 0.51 0A.3 tech 3D waves usgs
75391971 2026/07/08 13:20:31.770 37.60002 -122.46888 9.547 1.70 1 0.48 0A.3 tech 3D waves usgs
75391966 2026/07/08 13:12:54.480 39.34828 -123.19581 8.491 1.40 1 0.46 0A.3 tech 3D waves usgs
75391956 2026/07/08 12:21:30.300 37.48335 -118.80825 6.048 1.70 1 1.71 0A.3 tech 3D waves usgs LVC
75391941 2026/07/08 11:40:37.730 38.72873 -122.88949 -0.603 0.80 2 5.52 0A.3 tech 3D waves usgs
75391936 2026/07/08 11:36:50.030 38.82667 -122.73939 13.988 1.00 2 0.77 0A.3 tech 3D waves usgs GGF
75391931 2026/07/08 11:18:16.220 38.86428 -122.75898 16.403 1.40 2 0.55 0A.3 tech 3D waves usgs GGF
75391926 2026/07/08 10:49:18.020 36.96485 -121.45242 4.261 1.30 1 1.23 0A.3 tech 3D waves usgs
75391921 2026/07/08 10:47:33.810 38.85021 -122.82938 0.984 1.00 2 0.34 0A.3 tech 3D waves usgs GGF
75391911 2026/07/08 10:14:26.700 38.79574 -122.78311 3.793 0.70 1 0.27 0A.3 tech 3D waves usgs GGF
75391906 2026/07/08 10:08:8.760 36.78187 -121.40265 4.964 1.10 1 0.33 0A.3 tech 3D waves usgs
75391901 2026/07/08 10:07:8.820 38.82395 -122.85295 2.617 0.50 2 0.50 0A.3 tech 3D waves usgs GGF
75391891 2026/07/08 09:22:35.130 38.83753 -122.78630 1.866 0.70 2 0.17 0A.3 tech 3D waves usgs GGF

Events last processed:
75392096 2026/07/08 17:12:31.250 38.78062 -122.72055 1.560 1.00 1 0.17 0A.3 tech 3D waves usgs GGF
75392071 2026/07/08 16:37:12.880 37.52054 -121.81557 6.894 2.20 1 0.74 0A.3 tech 3D waves usgs CAL
75392066 2026/07/08 16:36:36.990 38.83599 -122.79856 2.300 0.70 2 0.14 0A.3 tech 3D waves usgs GGF
75392056 2026/07/08 16:02:22.680 38.75789 -122.72940 1.858 1.10 2 0.23 0A.3 tech 3D waves usgs GGF
75392026 2026/07/08 15:19:40.230 38.83870 -122.78293 2.228 0.60 2 0.61 0A.3 tech 3D waves usgs GGF
75391986 2026/07/08 13:43:56.150 38.80372 -122.76464 4.217 0.30 2 0.87 0A.3 tech 3D waves usgs GGF
75391981 2026/07/08 13:32:23.570 38.84315 -122.83380 8.281 0.40 2 0.64 0A.3 tech 3D waves usgs GGF
75391976 2026/07/08 13:27:54.500 37.60037 -122.47056 9.597 1.10 1 0.51 0A.3 tech 3D waves usgs
75391971 2026/07/08 13:20:31.770 37.60002 -122.46888 9.547 1.70 1 0.48 0A.3 tech 3D waves usgs
75391966 2026/07/08 13:12:54.480 39.34828 -123.19581 8.491 1.40 1 0.46 0A.3 tech 3D waves usgs



____________________________________________________________________________________________________
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-NEHRP grants 06HQGR0054, 08HQGR0043, G09AP00018, G10AC00040, G20AP00025.
Website developed and maintained by Felix Waldhauser and Ben Engebreth at LDEO, Columbia University.
[DD-RT Version 3.0.ncsn | Contact:  felixw@ldeo.columbia.edu]