Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Thu May 29 11:21:07 UTC 2025 ( Thu May 29 07:21:07 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
75188161 2025/05/29 10:43:35.910 36.06515 -120.20088 8.723 2.20 1 1.76 0A.3 tech 3D waves usgs
75188156 2025/05/29 10:42:31.100 36.06119 -120.21266 8.086 1.50 2 0.32 0A.3 tech 3D waves usgs
75188146 2025/05/29 10:15:10.140 38.82427 -122.84568 1.936 0.60 1 0.29 0A.3 tech 3D waves usgs GGF
75188136 2025/05/29 10:09:21.990 36.03530 -120.63120 -0.710 2.70 - - 0A.0 tech 3D waves usgs PKF
75188131 2025/05/29 10:06:53.340 38.81432 -122.80890 4.324 0.50 2 0.54 0A.3 tech 3D waves usgs GGF
75188126 2025/05/29 10:06:30.840 38.80463 -122.79321 0.682 0.90 2 0.18 0A.3 tech 3D waves usgs GGF
75188121 2025/05/29 09:30:50.640 38.82384 -122.75728 2.988 0.30 1 0.22 0A.3 tech 3D waves usgs GGF
75188111 2025/05/29 09:21:12.710 38.75846 -122.72811 2.068 0.30 1 0.34 2F.3 tech 3D waves usgs GGF
75188106 2025/05/29 09:00:58.320 38.81540 -122.76104 1.796 1.50 2 0.43 0A.3 tech 3D waves usgs GGF
75188101 2025/05/29 08:50:37.370 38.82423 -122.75972 1.774 0.60 2 0.12 0A.3 tech 3D waves usgs GGF
75188096 2025/05/29 08:02:38.150 38.81817 -122.82178 3.554 0.60 2 1.07 0A.3 tech 3D waves usgs GGF
75188091 2025/05/29 07:35:22.960 38.80253 -122.82869 9.494 1.10 2 1.22 0A.3 tech 3D waves usgs GGF
75188086 2025/05/29 06:59:45.750 38.82070 -122.84287 2.422 0.80 2 0.30 0A.3 tech 3D waves usgs GGF
75188076 2025/05/29 06:48:41.520 38.83358 -122.81594 2.943 0.80 2 2.20 0A.3 tech 3D waves usgs GGF
75188071 2025/05/29 06:44:10.260 38.83176 -122.80038 1.730 0.60 1 0.19 0A.3 tech 3D waves usgs GGF
75188066 2025/05/29 06:43:8.390 38.79297 -122.80837 3.537 0.30 2 0.14 0A.3 tech 3D waves usgs GGF
75188061 2025/05/29 06:24:57.840 38.83051 -122.81345 2.158 0.20 1 0.24 2F.3 tech 3D waves usgs GGF
75188056 2025/05/29 06:11:2.290 38.82973 -122.80025 1.866 0.70 2 1.40 0A.3 tech 3D waves usgs GGF
75188051 2025/05/29 06:02:22.490 38.40930 -122.07620 9.290 0.00 - - 0A.0 tech 3D waves usgs
75188036 2025/05/29 04:42:48.190 38.81789 -122.79608 2.395 0.80 2 0.40 0A.3 tech 3D waves usgs GGF

Events last processed:
75187616 2025/05/28 13:04:14.980 38.78242 -122.74558 0.877 0.60 1 0.08 2F.3 tech 3D waves usgs GGF
75188111 2025/05/29 09:21:12.710 38.75846 -122.72811 2.068 0.30 1 0.34 2F.3 tech 3D waves usgs GGF
75187736 2025/05/28 17:29:8.880 38.79333 -122.75562 0.688 0.30 1 0.25 2F.3 tech 3D waves usgs GGF
75187501 2025/05/28 05:45:8.260 38.83429 -122.80852 1.765 0.40 1 1.32 2F.3 tech 3D waves usgs GGF
75187841 2025/05/28 19:24:52.110 38.65175 -119.80934 5.926 2.50 2 1.21 2F.3 tech 3D waves usgs
75188161 2025/05/29 10:43:35.910 36.06515 -120.20088 8.723 2.20 1 1.76 0A.3 tech 3D waves usgs
75188156 2025/05/29 10:42:31.100 36.06119 -120.21266 8.086 1.50 2 0.32 0A.3 tech 3D waves usgs
75188061 2025/05/29 06:24:57.840 38.83051 -122.81345 2.158 0.20 1 0.24 2F.3 tech 3D waves usgs GGF
75184961 2025/05/22 14:43:47.870 37.95717 -122.02536 9.508 1.50 1 0.55 2F.3 tech 3D waves usgs
75188006 2025/05/29 03:17:1.150 38.84036 -122.82420 2.244 -0.10 1 0.28 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]