Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Tue Jul 8 11:02:04 UTC 2025 ( Tue Jul 8 07:02:04 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
75206487 2025/07/07 03:45:18.390 38.82579 -122.78637 1.823 0.30 1 0.14 2F.3 tech 3D waves usgs GGF
75206457 2025/07/07 01:48:37.370 38.81585 -122.75902 1.676 0.40 1 0.25 2F.3 tech 3D waves usgs GGF
75206417 2025/07/06 23:46:31.320 38.82708 -122.80787 2.858 0.40 1 0.22 2F.3 tech 3D waves usgs GGF
75206302 2025/07/06 15:57:7.810 38.82857 -122.80295 3.323 0.30 1 0.66 2F.3 tech 3D waves usgs GGF
75206292 2025/07/06 15:42:51.860 38.82368 -122.76648 2.508 0.50 1 0.16 2F.3 tech 3D waves usgs GGF
75206242 2025/07/06 12:12:41.030 38.83679 -122.78973 1.838 0.40 1 0.76 2F.3 tech 3D waves usgs GGF
75206222 2025/07/06 11:58:3.710 38.76758 -122.72590 1.137 0.30 1 0.17 2F.3 tech 3D waves usgs GGF
75206187 2025/07/06 09:16:25.840 37.64962 -118.84888 5.060 0.10 1 1.14 3F.3 tech 3D waves usgs LVC
75206162 2025/07/06 07:44:9.820 38.82942 -122.81139 1.694 0.20 1 0.12 2F.3 tech 3D waves usgs GGF
75206157 2025/07/06 06:47:0.970 36.55378 -121.07633 9.742 1.00 2 2.32 3F.3 tech 3D waves usgs
75206137 2025/07/06 05:00:9.590 38.79539 -122.77890 3.632 0.40 1 0.45 2F.3 tech 3D waves usgs GGF
75206117 2025/07/06 03:29:21.210 38.76844 -122.73192 2.328 0.40 1 0.14 2F.3 tech 3D waves usgs GGF
75205897 2025/07/05 22:45:22.920 37.12943 -121.52818 7.166 0.50 2 1.32 3F.3 tech 3D waves usgs CAL
75205852 2025/07/05 20:56:58.810 37.29307 -121.67371 1.677 0.90 1 0.87 3F.3 tech 3D waves usgs CAL
75205837 2025/07/05 20:06:11.650 37.32417 -122.08326 5.456 0.60 2 0.76 3F.3 tech 3D waves usgs
75205812 2025/07/05 18:40:18.910 38.80168 -122.78106 3.590 0.00 1 0.44 2F.3 tech 3D waves usgs GGF
75205807 2025/07/05 18:39:18.740 38.80262 -122.77968 3.545 0.30 1 0.44 2F.3 tech 3D waves usgs GGF
75205762 2025/07/05 14:34:18.650 38.78155 -122.74669 5.892 0.30 1 2.83 2F.3 tech 3D waves usgs GGF
75205757 2025/07/05 14:13:51.820 38.83922 -122.79821 2.401 0.30 1 0.14 2F.3 tech 3D waves usgs GGF
75205732 2025/07/05 11:54:39.450 38.82651 -122.85238 2.414 -0.20 1 0.41 4F.3 tech 3D waves usgs GGF

Events last processed:
75203346 2025/07/02 00:33:51.330 40.77555 -123.36716 26.447 2.30 1 0.37 2F.3 tech 3D waves usgs
75203271 2025/07/01 20:47:45.890 37.05763 -121.49111 4.107 2.50 1 0.70 2F.3 tech 3D waves usgs
75202746 2025/06/30 19:56:32.560 36.79071 -121.31943 3.586 0.60 1 1.41 3F.3 tech 3D waves usgs
75202951 2025/07/01 06:48:34.890 37.40882 -118.56870 10.625 2.70 1 1.01 3F.3 tech 3D waves usgs LVC
75202951 2025/07/01 06:48:34.890 37.40882 -118.56870 10.625 2.70 1 1.01 2F.3 tech 3D waves usgs LVC
75203606 2025/07/02 15:51:0.640 38.82357 -122.84495 2.103 0.30 1 0.06 2F.3 tech 3D waves usgs GGF
75203596 2025/07/02 15:35:17.850 39.55357 -122.97645 14.013 1.80 2 1.26 2F.3 tech 3D waves usgs
75203501 2025/07/02 12:23:35.570 37.70930 -121.97445 9.322 1.20 1 1.35 2F.3 tech 3D waves usgs
75203251 2025/07/01 20:35:15.450 38.82263 -122.84563 2.299 0.30 1 0.10 2F.3 tech 3D waves usgs GGF
75203236 2025/07/01 19:24:11.220 37.29411 -122.05465 5.287 0.80 2 2.16 4F.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]