Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Sun Jun 7 17:32:06 UTC 2026 ( Sun Jun 7 13:32:06 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
75372516 2026/06/07 17:24:43.500 38.83628 -122.83634 1.948 0.60 1 0.14 0A.3 tech 3D waves usgs GGF
75372511 2026/06/07 17:17:27.830 35.79762 -121.26649 6.645 1.20 2 2.03 0A.3 tech 3D waves usgs
75372501 2026/06/07 17:11:34.250 38.84811 -122.84683 1.671 1.30 2 0.05 0A.3 tech 3D waves usgs GGF
75372496 2026/06/07 17:06:5.410 38.77749 -122.72526 1.657 1.10 2 0.20 0A.3 tech 3D waves usgs GGF
75372491 2026/06/07 16:56:13.760 38.84883 -122.84681 1.654 1.10 1 0.45 0A.3 tech 3D waves usgs GGF
75372486 2026/06/07 16:50:13.560 36.74420 -120.62920 -0.490 0.00 - - 0A.0 tech 3D waves usgs
75372481 2026/06/07 16:44:13.180 38.84805 -122.84605 1.184 0.20 2 0.04 0A.3 tech 3D waves usgs GGF
75372476 2026/06/07 16:37:9.220 38.84648 -122.84778 1.563 0.70 2 0.12 0A.3 tech 3D waves usgs GGF
75372471 2026/06/07 16:36:40.430 38.84778 -122.84570 1.386 0.60 2 0.09 0A.3 tech 3D waves usgs GGF
75372466 2026/06/07 16:32:33.570 38.80146 -122.77195 1.502 1.10 2 0.09 0A.3 tech 3D waves usgs GGF
75372461 2026/06/07 16:31:35.170 38.84827 -122.85020 1.501 0.20 2 0.14 0A.3 tech 3D waves usgs GGF
75372456 2026/06/07 16:31:21.190 38.84742 -122.84552 1.365 0.20 2 0.16 0A.3 tech 3D waves usgs GGF
75372446 2026/06/07 16:21:16.690 38.15000 -122.14950 4.610 0.00 - - 0A.0 tech 3D waves usgs
75372441 2026/06/07 15:56:13.090 37.84052 -122.04398 11.868 1.90 1 0.75 0A.3 tech 3D waves usgs
75372436 2026/06/07 15:50:9.970 38.82917 -122.80649 -0.930 1.00 2 5.32 0A.3 tech 3D waves usgs GGF
75372426 2026/06/07 15:37:48.920 37.83799 -122.04179 12.073 3.50 2 2.51 2A.3 tech 3D waves usgs
75372421 2026/06/07 15:23:56.040 38.83361 -122.96579 10.267 0.50 2 9.11 0A.3 tech 3D waves usgs
75372416 2026/06/07 15:13:51.630 38.63030 -122.70000 4.180 1.20 - - 0A.0 tech 3D waves usgs
75372406 2026/06/07 15:00:6.420 39.93800 -120.41350 0.440 1.90 - - 0A.0 tech 3D waves usgs
75372401 2026/06/07 14:58:3.970 39.92562 -120.41049 8.918 2.20 2 0.68 0A.3 tech 3D waves usgs

Events last processed:
75372516 2026/06/07 17:24:43.500 38.83628 -122.83634 1.948 0.60 1 0.14 0A.3 tech 3D waves usgs GGF
75372511 2026/06/07 17:17:27.830 35.79762 -121.26649 6.645 1.20 2 2.03 0A.3 tech 3D waves usgs
75372501 2026/06/07 17:11:34.250 38.84811 -122.84683 1.671 1.30 2 0.05 0A.3 tech 3D waves usgs GGF
75372496 2026/06/07 17:06:5.410 38.77749 -122.72526 1.657 1.10 2 0.20 0A.3 tech 3D waves usgs GGF
75372491 2026/06/07 16:56:13.760 38.84883 -122.84681 1.654 1.10 1 0.45 0A.3 tech 3D waves usgs GGF
75372486 2026/06/07 16:50:13.560 36.74420 -120.62920 -0.490 0.00 - - 0A.0 tech 3D waves usgs
75372481 2026/06/07 16:44:13.180 38.84805 -122.84605 1.184 0.20 2 0.04 0A.3 tech 3D waves usgs GGF
75372476 2026/06/07 16:37:9.220 38.84648 -122.84778 1.563 0.70 2 0.12 0A.3 tech 3D waves usgs GGF
75372471 2026/06/07 16:36:40.430 38.84778 -122.84570 1.386 0.60 2 0.09 0A.3 tech 3D waves usgs GGF
75372466 2026/06/07 16:32:33.570 38.80146 -122.77195 1.502 1.10 2 0.09 0A.3 tech 3D waves 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-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]