Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Wed Apr 2 06:26:03 UTC 2025 ( Wed Apr 2 02:26:04 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
75158742 2025/04/01 23:58:54.150 37.70848 -121.97678 9.580 2.90 1 1.70 3F.3 tech 3D waves usgs
75158097 2025/03/31 15:09:11.970 38.82947 -122.81488 2.087 0.40 1 0.16 2F.3 tech 3D waves usgs GGF
75157962 2025/03/31 04:28:13.800 38.84159 -122.81007 2.118 0.40 1 0.59 2F.3 tech 3D waves usgs GGF
75157937 2025/03/31 03:26:24.710 38.83714 -122.80781 2.006 0.70 1 0.39 2F.3 tech 3D waves usgs GGF
75157932 2025/03/31 02:53:28.120 38.78858 -122.74926 3.967 0.50 2 0.29 2F.3 tech 3D waves usgs GGF
75157887 2025/03/31 01:00:19.740 38.79227 -122.77763 1.594 -0.10 1 0.15 4F.3 tech 3D waves usgs GGF
75157867 2025/03/30 23:28:1.000 38.78398 -122.75960 2.240 0.60 1 0.23 2F.3 tech 3D waves usgs GGF
75157857 2025/03/30 23:14:43.890 38.78963 -122.73428 1.552 0.70 1 0.19 2F.3 tech 3D waves usgs GGF
75157807 2025/03/30 20:33:31.170 38.78862 -122.74600 1.455 0.50 1 0.46 2F.3 tech 3D waves usgs GGF
75157712 2025/03/30 11:37:1.890 38.83555 -122.81510 1.985 1.50 1 0.22 2F.3 tech 3D waves usgs GGF
75157667 2025/03/30 10:03:1.530 38.83493 -122.80449 1.885 0.40 1 0.06 2F.3 tech 3D waves usgs GGF
75157607 2025/03/30 08:02:16.920 37.74287 -122.19717 5.853 0.70 1 0.72 2F.3 tech 3D waves usgs HAY
75157312 2025/03/29 17:13:35.830 37.53007 -118.98501 1.666 0.30 2 1.34 3F.3 tech 3D waves usgs LVC
75157257 2025/03/29 15:10:32.210 41.18723 -122.10799 7.869 1.70 1 2.33 2F.3 tech 3D waves usgs
75157192 2025/03/29 11:57:10.820 37.47290 -118.75330 6.188 0.60 1 2.30 3F.3 tech 3D waves usgs LVC
75157162 2025/03/29 11:03:32.420 36.45563 -121.03296 5.197 1.60 1 1.97 2F.3 tech 3D waves usgs
75156827 2025/03/28 18:48:6.630 36.93017 -121.40909 6.133 1.80 1 1.08 2F.3 tech 3D waves usgs
75156742 2025/03/28 16:17:6.810 39.27179 -123.32357 3.217 1.20 1 1.24 2F.3 tech 3D waves usgs
75156672 2025/03/28 13:25:31.540 36.69178 -121.32515 5.137 0.90 1 0.76 3F.3 tech 3D waves usgs
75156482 2025/03/28 02:58:28.930 38.69398 -122.50168 6.708 0.90 2 0.56 2F.3 tech 3D waves usgs

Events last processed:
75154067 2025/03/23 21:58:52.560 40.32817 -124.63944 16.809 2.30 1 3.60 2F.3 tech 3D waves usgs MTJ
75153977 2025/03/23 18:45:10.240 36.79753 -121.49359 4.900 0.80 1 2.73 2F.3 tech 3D waves usgs
75158742 2025/04/01 23:58:54.150 37.70848 -121.97678 9.580 2.90 1 1.70 3F.3 tech 3D waves usgs
75153972 2025/03/23 18:27:6.440 36.22538 -120.78957 5.319 1.50 1 0.53 2F.3 tech 3D waves usgs
75153957 2025/03/23 17:30:58.760 37.51774 -118.87287 3.047 2.80 2 0.46 2F.3 tech 3D waves usgs LVC
75153907 2025/03/23 16:16:13.100 37.79871 -121.91366 15.649 1.80 1 0.92 2F.3 tech 3D waves usgs
75153862 2025/03/23 14:54:49.290 37.17842 -121.93085 3.690 1.00 2 1.36 2F.3 tech 3D waves usgs
75153727 2025/03/23 10:13:45.760 36.93300 -121.43441 5.785 1.00 1 1.98 2F.3 tech 3D waves usgs
75152012 2025/03/20 09:03:15.680 38.82666 -122.80541 1.528 1.30 1 0.29 2F.3 tech 3D waves usgs GGF
75153687 2025/03/23 08:40:44.460 37.03238 -121.48301 7.095 1.20 1 0.64 2F.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]