Real-Time Double-Difference Earthquake Catalog for Northern California

Last updated on Mon May 19 02:22:03 UTC 2025 ( Sun May 18 22:22:03 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
75183697 2025/05/17 22:57:22.500 38.82211 -122.84486 2.333 0.30 1 0.39 2F.3 tech 3D waves usgs GGF
75183687 2025/05/17 22:40:16.490 38.82917 -122.80176 2.067 0.40 1 0.28 2F.3 tech 3D waves usgs GGF
75183632 2025/05/17 19:36:2.370 38.82557 -122.80377 2.681 0.50 1 0.40 2F.3 tech 3D waves usgs GGF
75183562 2025/05/17 15:43:14.700 38.79598 -122.78032 3.589 0.30 1 0.21 2F.3 tech 3D waves usgs GGF
75183532 2025/05/17 15:07:55.950 38.83744 -122.79740 2.112 0.40 1 0.22 2F.3 tech 3D waves usgs GGF
75183477 2025/05/17 13:27:6.940 38.82384 -122.76003 1.938 0.50 1 0.15 2F.3 tech 3D waves usgs GGF
75183427 2025/05/17 11:09:16.950 37.53111 -118.77539 7.280 0.90 1 1.04 3F.3 tech 3D waves usgs LVC
75183387 2025/05/17 10:16:10.010 38.81588 -122.81798 2.278 0.30 1 0.24 2F.3 tech 3D waves usgs GGF
75183327 2025/05/17 05:51:18.640 40.27420 -124.62650 5.630 3.50 - - 5F.0 tech 3D waves usgs MTJ
75183322 2025/05/17 05:36:16.840 37.48503 -118.49082 15.417 1.50 2 0.61 3F.3 tech 3D waves usgs
75183247 2025/05/17 03:28:2.770 38.81819 -122.76411 1.803 0.40 1 0.12 2F.3 tech 3D waves usgs GGF
75183242 2025/05/17 03:27:10.120 38.83995 -122.80998 2.010 0.30 1 0.16 4F.3 tech 3D waves usgs GGF
75183192 2025/05/17 01:13:54.530 37.48849 -118.49683 13.622 1.10 1 0.79 3F.3 tech 3D waves usgs
75183172 2025/05/17 00:35:31.490 38.83559 -122.78283 1.931 0.30 2 0.28 2F.3 tech 3D waves usgs GGF
75183147 2025/05/16 23:01:57.590 38.81941 -122.81374 3.239 0.30 1 0.25 2F.3 tech 3D waves usgs GGF
75183102 2025/05/16 21:27:22.430 38.82631 -122.80327 2.743 0.60 1 0.33 2F.3 tech 3D waves usgs GGF
75183067 2025/05/16 20:07:45.300 40.32724 -124.80980 7.707 2.00 2 0.81 3F.3 tech 3D waves usgs MTJ
75183032 2025/05/16 19:05:24.530 38.82435 -122.81130 2.901 -0.10 1 0.20 2F.3 tech 3D waves usgs GGF
75183017 2025/05/16 18:38:12.050 38.82007 -122.81410 3.189 0.20 1 0.34 2F.3 tech 3D waves usgs GGF
75182937 2025/05/16 16:32:19.330 37.28583 -121.66536 2.872 1.00 1 0.68 3F.3 tech 3D waves usgs CAL

Events last processed:
75183697 2025/05/17 22:57:22.500 38.82211 -122.84486 2.333 0.30 1 0.39 2F.3 tech 3D waves usgs GGF
75183687 2025/05/17 22:40:16.490 38.82917 -122.80176 2.067 0.40 1 0.28 2F.3 tech 3D waves usgs GGF
75183632 2025/05/17 19:36:2.370 38.82557 -122.80377 2.681 0.50 1 0.40 2F.3 tech 3D waves usgs GGF
75183562 2025/05/17 15:43:14.700 38.79598 -122.78032 3.589 0.30 1 0.21 2F.3 tech 3D waves usgs GGF
75183532 2025/05/17 15:07:55.950 38.83744 -122.79740 2.112 0.40 1 0.22 2F.3 tech 3D waves usgs GGF
75183477 2025/05/17 13:27:6.940 38.82384 -122.76003 1.938 0.50 1 0.15 2F.3 tech 3D waves usgs GGF
75183387 2025/05/17 10:16:10.010 38.81588 -122.81798 2.278 0.30 1 0.24 2F.3 tech 3D waves usgs GGF
75183242 2025/05/17 03:27:10.120 38.83995 -122.80998 2.010 0.30 1 0.16 4F.3 tech 3D waves usgs GGF
75183247 2025/05/17 03:28:2.770 38.81819 -122.76411 1.803 0.40 1 0.12 2F.3 tech 3D waves usgs GGF
75183242 2025/05/17 03:27:10.080 38.84063 -122.81051 2.276 0.10 2 6.59 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]