Earthquake · reviewed by a seismologist
M 2.4md
Earthquake near Ferndale, CA
No earthquake was likely felt in Ferndale in the 24 hours to 4:25 am PST (12:25 UTC). The last one was M 5.0, 113 km (70 mi) W, at 8:56 pm PST on 4 November 2026, estimated intensity III (weak) in town; 145 felt reports to USGS. Every earthquake near Ferndale
This page: a magnitude 2.4 earthquake was recorded 17 km (11 mi) northwest of Ferndale, CA, at 5:12 am PDT on 16 July 2023 (12:12 UTC), 20 km deep.
USGS: 17 km NW of Ferndale, CA
- When
- 5:12 am PDT on 16 July 2023 ()
- Where
- 17 km (11 mi) northwest of Ferndale, CA · earthquakes near Ferndale
- Magnitude
- M 2.4 (md)
- Depth
- 20 km below the surface
- Felt
- no reports yet
- Nearest
- Humboldt County, 39 km E
- Nearest mapped fault
- Little Salmon fault, 15 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1213 days ago
Earthquake alerts for Ferndale, CA
Get a notification in this browser when USGS records an earthquake near Ferndale, CA. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 5 km (3 mi) from the epicentre. In Ferndale, 17 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Humboldt Hill, Bayview, Pine Hills, Fortuna, Cutten, Eureka.
How big was it?
This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
- Magna, Utah 2020 M 5.7 92,000× the energy of this one
- Around the size people start to feel M 3.0 8.2× the energy of this one
- This earthquake M 2.4 about 120 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
The largest earthquake within 50 km since 2016 was M 6.4 on 2022-12-20 — about 1,000,000 times the energy of this one.
Before 2016, the USGS record lists 37 earthquakes of M5 or more within 50 km; the five largest:
- 7.2 The 1980 Eureka, California Earthquake · 48 km NNE of this epicentre
- 7.2 The 1992 Petrolia, California Earthquake · 42 km SSE of this epicentre
- 6.6 32 km SW of Ferndale, California · 37 km SSW of this epicentre
- 6.5 The 1932 Eureka, California Earthquake · 10 km ENE of this epicentre
- 6.5 30 km WSW of Ferndale, California · 33 km SSW of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 40.6952, -124.3932. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Humboldt County, CA | 39 km (24 mi) | E | earthquakes near Humboldt County |
| Trinity County, CA | 108 km (67 mi) | E | earthquakes near Trinity County |
| Del Norte County, CA | 122 km (76 mi) | NNE | earthquakes near Del Norte County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 1.8 22 km WSW of Petrolia, CA
- 2.4 21 km WSW of Petrolia, CA
- 2.2 14 km WSW of Ferndale, CA
- 1.7 8 km S of Rio Dell, CA
- 1.8 15 km SW of Ferndale, CA
- 2.1 10 km SW of Petrolia, CA
- 2.5 23 km W of Petrolia, CA
- 2.1 13 km WSW of Ferndale, CA
- 1.8 4 km NE of Petrolia, CA
- 1.5 10 km WNW of Petrolia, CA
- 2.0 13 km WSW of Ferndale, CA
- 2.1 4 km E of Ferndale, CA
- 3.1 23 km W of Petrolia, CA
- 2.3 14 km WSW of Ferndale, CA
- 1.6 2 km NE of Petrolia, CA
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.