Earthquake · reviewed by a seismologist
M 2.4md
Earthquake near Ferndale, CA
No earthquake was likely felt in Ferndale in the 24 hours to 9:29 am PST (17:29 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 45 km (28 mi) southwest of Ferndale, CA, at 5:11 am PST on 2 February 2024 (13:11 UTC), 18 km deep. 2 people have reported feeling it to USGS.
USGS: 31 km W of Petrolia, CA
- When
- 5:11 am PST on 2 February 2024 ()
- Where
- 45 km (28 mi) southwest of Ferndale, CA · earthquakes near Ferndale
- Magnitude
- M 2.4 (md)
- Depth
- 18 km below the surface
- Felt
- 2 reports · strongest reported intensity I
- Nearest
- Humboldt County, 76 km NE
- Nearest mapped fault
- Mattole Canyon fault, 18 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 943 days ago
Earthquake alerts for Ferndale, CA
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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 9 km (6 mi) from the epicentre. In Ferndale, 45 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.
How big was it?
This earthquake released about 110 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 95,000× the energy of this one
- Around the size people start to feel M 3.0 8.5× the energy of this one
- This earthquake M 2.4 about 110 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 1,100,000 times the energy of this one.
Before 2016, the USGS record lists 42 earthquakes of M5 or more within 50 km; the five largest:
- 7.2 The 1992 Petrolia, California Earthquake · 36 km E of this epicentre
- 6.6 32 km SW of Ferndale, California · 12 km NE of this epicentre
- 6.5 30 km WSW of Ferndale, California · 16 km NNE of this epicentre
- 6.5 The 2010 Eureka, California Earthquake · 39 km N of this epicentre
- 6.0 Near Rio Dell, California · 44 km ENE 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 40.2998, -124.6473. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Humboldt County, CA | 76 km (47 mi) | NE | earthquakes near Humboldt County |
| Mendocino County, CA | 141 km (88 mi) | SE | earthquakes near Mendocino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 2.7 12 km WSW of Ferndale, CA
- 2.0 14 km WSW of Ferndale, CA
- 1.6 11 km WSW of Ferndale, CA
- 2.7 46 km W of Petrolia, CA
- 1.5 14 km WSW of Ferndale, CA
- 1.8 22 km WNW of Ferndale, CA
- 2.6 21 km W of Petrolia, CA
- 1.8 13 km WSW of Petrolia, CA
- 2.9 74 km W of Petrolia, CA
- 3.3 10 km WSW of Petrolia, CA
- 2.2 28 km WNW of Petrolia, CA
- 2.2 8 km WSW of Petrolia, CA
- 1.9 24 km WSW of Petrolia, CA
- 2.2 8 km WSW of Petrolia, CA
- 2.3 9 km WSW 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.