Earthquake · reviewed by a seismologist
M 2.6md
31km WNW of Petrolia, CA
- When
- Magnitude
- M 2.6 (md)
- Depth
- 24 km below the surface
- Felt
- no reports yet
- Nearest
- Humboldt County, 67 km ENE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1212 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
How big was it?
This earthquake released about 230 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 65,000× the energy of this one
- Magna, Utah 2020 M 5.7 46,000× the energy of this one
- Around the size people start to feel M 3.0 4.1× the energy of this one
- This earthquake M 2.6 about 230 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.
Where
Epicentre 40.4155, -124.6255. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Humboldt County, CA | 67 km (42 mi) | WSW of here | earthquakes near Humboldt County |
| Mendocino County, CA | 149 km (92 mi) | NW of here | earthquakes near Mendocino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.9 14km WSW of Ferndale, CA
- 3.1 17km WSW of Petrolia, CA
- 2.6 25km WSW of Ferndale, CA
- 1.9 13km WSW of Ferndale, CA
- 1.9 20km WSW of Ferndale, CA
- 2.8 20km WSW of Ferndale, CA
- 2.3 19km WSW of Ferndale, CA
- 1.6 10km SSW of Ferndale, CA
- 1.8 5km N of Fortuna, CA
- 1.8 12km SSW of Ferndale, CA
- 1.9 7km NNE of Petrolia, CA
- 2.4 3km SSW of Ferndale, CA
- 2.6 58km W of Petrolia, CA
- 1.9 16km WSW of Ferndale, CA
- 1.7 3km SE of Fortuna, 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.
For this area
The largest earthquake within 50 km in our catalogue was M 6.4 on 2022-12-20 — it released about 520,000 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.