Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Tue Aug 25 05:32:06 UTC 2026 ( Tue Aug 25 01:32:06 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
75424757 2026/08/25 05:00:30.660 38.79474 -122.81203 3.162 0.30 1 0.22 0A.3 tech 3D waves usgs GGF
75424752 2026/08/25 04:58:59.320 38.81877 -122.84233 1.716 0.70 2 0.28 0A.3 tech 3D waves usgs GGF
75424747 2026/08/25 04:50:44.720 38.84674 -122.84801 1.599 0.30 2 0.09 0A.3 tech 3D waves usgs GGF
75424742 2026/08/25 04:49:8.280 38.82897 -122.80555 7.745 0.40 2 1.02 0A.3 tech 3D waves usgs GGF
75424737 2026/08/25 04:47:59.560 38.81985 -122.79477 3.369 1.10 1 0.24 0A.3 tech 3D waves usgs GGF
75424722 2026/08/25 04:18:52.780 38.83125 -122.81460 1.702 0.50 2 0.13 0A.3 tech 3D waves usgs GGF
75424717 2026/08/25 04:11:15.480 38.79534 -122.80555 3.740 0.80 2 0.52 0A.3 tech 3D waves usgs GGF
75424712 2026/08/25 03:47:29.680 38.75814 -122.71326 1.671 0.90 1 0.14 0A.3 tech 3D waves usgs GGF
75424707 2026/08/25 03:43:2.870 37.57996 -121.70046 6.686 1.30 1 1.95 0A.3 tech 3D waves usgs
75424697 2026/08/25 03:17:0.850 36.58430 -121.35500 3.510 0.00 - - 0A.0 tech 3D waves usgs
75424692 2026/08/25 03:10:14.720 38.82990 -122.81584 2.067 0.20 2 0.57 0A.3 tech 3D waves usgs GGF
75424687 2026/08/25 03:09:11.290 38.83061 -122.81757 1.740 0.70 1 0.27 0A.3 tech 3D waves usgs GGF
75424677 2026/08/25 02:28:14.880 38.81451 -122.81650 0.568 1.00 1 0.06 0A.3 tech 3D waves usgs GGF
75424672 2026/08/25 02:14:18.370 38.82058 -122.84294 2.045 0.30 2 0.19 0A.3 tech 3D waves usgs GGF
75424662 2026/08/25 02:06:37.610 38.81714 -122.85029 2.419 0.80 1 2.35 0A.3 tech 3D waves usgs GGF
75424657 2026/08/25 01:57:25.050 39.32646 -123.26604 5.792 1.00 1 1.04 0A.3 tech 3D waves usgs
75424652 2026/08/25 01:56:4.730 39.32478 -123.26774 6.022 1.40 1 0.34 0A.3 tech 3D waves usgs
75424642 2026/08/25 01:43:30.620 38.74766 -122.70303 1.520 0.70 1 0.30 0A.3 tech 3D waves usgs GGF
75424637 2026/08/25 01:34:46.430 39.32482 -123.26347 6.936 1.50 1 0.26 0A.3 tech 3D waves usgs
75424622 2026/08/25 01:12:10.830 38.83333 -122.79362 1.894 0.20 2 0.32 0A.3 tech 3D waves usgs GGF

Events last processed:
75424757 2026/08/25 05:00:30.660 38.79474 -122.81203 3.162 0.30 1 0.22 0A.3 tech 3D waves usgs GGF
75424752 2026/08/25 04:58:59.320 38.81877 -122.84233 1.716 0.70 2 0.28 0A.3 tech 3D waves usgs GGF
75424747 2026/08/25 04:50:44.720 38.84674 -122.84801 1.599 0.30 2 0.09 0A.3 tech 3D waves usgs GGF
75424742 2026/08/25 04:49:8.280 38.82897 -122.80555 7.745 0.40 2 1.02 0A.3 tech 3D waves usgs GGF
75424737 2026/08/25 04:47:59.560 38.81985 -122.79477 3.369 1.10 1 0.24 0A.3 tech 3D waves usgs GGF
75417632 2026/08/13 17:20:19.810 37.74750 -122.14136 6.743 0.80 1 0.42 3F.3 tech 3D waves usgs HAY
75417597 2026/08/13 16:38:15.300 37.75750 -122.14148 4.656 1.60 1 1.41 2F.3 tech 3D waves usgs HAY
75424722 2026/08/25 04:18:52.780 38.83125 -122.81460 1.702 0.50 2 0.13 0A.3 tech 3D waves usgs GGF
75417602 2026/08/13 16:37:0.100 37.75064 -122.14893 6.747 0.90 1 0.55 3F.3 tech 3D waves usgs HAY
75424717 2026/08/25 04:11:15.480 38.79534 -122.80555 3.740 0.80 2 0.52 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]