Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Sat Jul 12 07:28:03 UTC 2025 ( Sat Jul 12 03:28:03 EDT 2025 )

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

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
75208512 2025/07/11 22:30:6.040 38.83697 -122.80264 2.373 0.40 1 0.12 2F.3 tech 3D waves usgs GGF
75208477 2025/07/11 20:01:35.890 38.79175 -122.77548 2.214 0.20 1 0.21 2F.3 tech 3D waves usgs GGF
75208472 2025/07/11 19:46:29.650 38.83478 -122.78470 2.316 0.40 1 0.17 2F.3 tech 3D waves usgs GGF
75208447 2025/07/11 16:43:53.570 38.84290 -122.82377 1.901 0.20 1 0.14 2F.3 tech 3D waves usgs GGF
75208432 2025/07/11 15:34:53.010 38.83333 -122.88185 2.062 0.40 1 0.20 2F.3 tech 3D waves usgs GGF
75208427 2025/07/11 15:06:6.880 40.34895 -124.88815 12.503 3.00 1 1.78 4F.3 tech 3D waves usgs MTJ
75208352 2025/07/11 10:26:42.470 38.81354 -122.82599 1.948 0.40 1 0.14 2F.3 tech 3D waves usgs GGF
75208312 2025/07/11 08:44:1.640 38.69081 -122.49912 7.015 1.50 1 0.73 2F.3 tech 3D waves usgs
75208247 2025/07/11 06:36:39.370 38.83487 -122.80764 2.434 0.40 1 0.08 2F.3 tech 3D waves usgs GGF
75208237 2025/07/11 06:07:15.940 38.83774 -122.80041 2.144 0.40 2 0.35 2F.3 tech 3D waves usgs GGF
75208227 2025/07/11 05:59:55.410 38.83438 -122.80732 2.251 0.40 1 0.12 2F.3 tech 3D waves usgs GGF
75208222 2025/07/11 05:59:20.180 38.82926 -122.81941 1.808 0.20 1 0.20 2F.3 tech 3D waves usgs GGF
75208217 2025/07/11 05:58:59.140 38.83794 -122.80747 2.158 0.40 1 0.11 2F.3 tech 3D waves usgs GGF
75208187 2025/07/11 05:46:50.810 38.83667 -122.80644 2.474 2.90 1 0.26 2F.3 tech 3D waves usgs GGF
75208147 2025/07/11 05:29:49.430 38.83415 -122.79775 2.109 0.30 1 0.10 2F.3 tech 3D waves usgs GGF
75208142 2025/07/11 04:52:53.740 37.66454 -121.41990 8.777 1.30 2 0.82 3F.3 tech 3D waves usgs
75208117 2025/07/11 02:43:56.760 38.83223 -122.79525 1.718 0.50 1 0.14 2F.3 tech 3D waves usgs GGF
75208107 2025/07/11 02:16:9.900 35.94246 -120.48723 9.528 3.20 2 0.44 3F.3 tech 3D waves usgs PKF
75208072 2025/07/10 23:06:27.780 38.83786 -122.83629 1.619 0.20 1 0.07 2F.3 tech 3D waves usgs GGF
75208047 2025/07/10 20:57:36.860 37.06540 -121.50184 6.684 0.90 1 2.15 3F.3 tech 3D waves usgs

Events last processed:
75206647 2025/07/07 12:21:31.080 40.56660 -123.91341 22.532 1.50 1 2.05 2F.3 tech 3D waves usgs MTJ
75206087 2025/07/06 02:28:50.510 39.28483 -123.40772 5.737 1.10 1 1.12 2F.3 tech 3D waves usgs
75205767 2025/07/05 14:36:44.150 37.30201 -122.09715 7.287 1.50 1 1.31 2F.3 tech 3D waves usgs
75205727 2025/07/05 11:55:8.770 38.59362 -122.80536 3.577 1.30 1 2.52 2F.3 tech 3D waves usgs
75205417 2025/07/04 19:04:19.620 37.92352 -122.07400 5.814 1.40 1 0.59 2F.3 tech 3D waves usgs
75204141 2025/07/03 18:48:35.070 37.55922 -118.84987 7.490 1.20 2 1.74 3F.3 tech 3D waves usgs LVC
75204141 2025/07/03 18:48:35.070 37.55922 -118.84987 7.490 1.20 2 1.74 2F.3 tech 3D waves usgs LVC
75203971 2025/07/03 11:19:56.820 37.56235 -118.67896 6.242 1.30 1 1.03 2F.3 tech 3D waves usgs LVC
75208512 2025/07/11 22:30:6.040 38.83697 -122.80264 2.373 0.40 1 0.12 2F.3 tech 3D waves usgs GGF
75208447 2025/07/11 16:43:53.570 38.84290 -122.82377 1.901 0.20 1 0.14 2F.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]