Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Fri Feb 20 09:48:04 UTC 2026 ( Fri Feb 20 04:48:04 EST 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
75314172 2026/02/15 09:16:18.960 41.57500 -121.62270 0.250 1.90 - - 2F.0 tech 3D waves usgs
75314147 2026/02/15 08:29:3.800 40.33398 -124.93403 10.017 2.70 2 1.34 3F.3 tech 3D waves usgs MTJ
75313697 2026/02/14 12:30:43.890 40.31562 -124.64059 8.301 3.00 1 1.52 3F.3 tech 3D waves usgs MTJ
75312862 2026/02/12 20:49:34.700 40.35454 -124.88230 13.557 2.60 1 2.62 3F.3 tech 3D waves usgs MTJ
75312362 2026/02/12 01:41:6.130 40.32761 -124.57602 12.586 3.00 1 1.14 3F.3 tech 3D waves usgs MTJ
75312357 2026/02/12 01:39:12.120 40.39784 -125.17457 9.942 3.20 2 0.83 3F.3 tech 3D waves usgs MTJ
75312237 2026/02/11 17:00:41.910 40.35080 -124.36244 15.533 3.00 1 2.57 3F.3 tech 3D waves usgs MTJ
75312122 2026/02/11 11:34:54.750 36.78487 -121.41088 4.963 3.10 1 2.79 4F.3 tech 3D waves usgs
75312022 2026/02/11 06:36:24.400 37.96301 -118.64862 0.414 1.20 1 1.70 3F.3 tech 3D waves usgs LVC
75311672 2026/02/10 06:31:27.710 38.83251 -122.81445 2.391 0.40 1 0.32 2F.3 tech 3D waves usgs GGF
75311667 2026/02/10 06:27:6.700 37.66180 -118.80609 3.550 0.70 1 0.32 2F.3 tech 3D waves usgs LVC
75311657 2026/02/10 05:31:45.300 39.21490 -120.38624 -1.421 1.70 2 0.54 2F.3 tech 3D waves usgs
75311652 2026/02/10 05:21:35.210 36.23270 -120.79832 7.018 0.70 2 0.46 2F.3 tech 3D waves usgs
75311632 2026/02/10 04:31:39.440 38.79268 -122.77644 1.641 0.60 1 0.31 2F.3 tech 3D waves usgs GGF
75311627 2026/02/10 04:18:4.370 39.80134 -122.85699 9.000 3.20 2 2.28 3F.3 tech 3D waves usgs
75311622 2026/02/10 04:17:58.450 38.81863 -122.76642 1.524 0.40 1 0.89 2F.3 tech 3D waves usgs GGF
75311592 2026/02/10 02:33:44.250 38.82311 -122.76361 2.461 0.50 1 0.31 2F.3 tech 3D waves usgs GGF
75311572 2026/02/10 02:08:17.300 38.75403 -122.72087 1.285 0.30 1 0.32 2F.3 tech 3D waves usgs GGF
75311552 2026/02/10 01:24:12.930 37.78068 -121.94413 6.671 1.80 1 1.39 3F.3 tech 3D waves usgs
75311547 2026/02/10 01:22:47.070 37.78017 -121.94331 7.690 0.70 1 2.99 2F.3 tech 3D waves usgs

Events last processed:
75311672 2026/02/10 06:31:27.710 38.83251 -122.81445 2.391 0.40 1 0.32 2F.3 tech 3D waves usgs GGF
75311667 2026/02/10 06:27:6.700 37.66180 -118.80609 3.550 0.70 1 0.32 2F.3 tech 3D waves usgs LVC
75311657 2026/02/10 05:31:45.300 39.21490 -120.38624 -1.421 1.70 2 0.54 2F.3 tech 3D waves usgs
75311342 2026/02/09 17:41:54.600 38.82953 -122.81437 2.446 0.30 1 0.22 2F.3 tech 3D waves usgs GGF
75311632 2026/02/10 04:31:39.440 38.79268 -122.77644 1.641 0.60 1 0.31 2F.3 tech 3D waves usgs GGF
75311622 2026/02/10 04:17:58.450 38.81863 -122.76642 1.524 0.40 1 0.89 2F.3 tech 3D waves usgs GGF
75311592 2026/02/10 02:33:44.250 38.82311 -122.76361 2.461 0.50 1 0.31 2F.3 tech 3D waves usgs GGF
75311652 2026/02/10 05:21:35.210 36.23270 -120.79832 7.018 0.70 2 0.46 2F.3 tech 3D waves usgs
75311572 2026/02/10 02:08:17.300 38.75403 -122.72087 1.285 0.30 1 0.32 2F.3 tech 3D waves usgs GGF
75311507 2026/02/09 23:19:40.130 37.76483 -121.93651 6.778 1.00 1 1.58 3F.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]