Earthquake · reviewed by a seismologist
M 2.2md
7km SW of Ferndale, CA
- When
- Magnitude
- M 2.2 (md)
- Depth
- 18 km below the surface
- Felt
- no reports yet
- Nearest
- Humboldt County, 39 km ENE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1367 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 56 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 270,000× the energy of this one
- Magna, Utah 2020 M 5.7 190,000× the energy of this one
- Around the size people start to feel M 3.0 17× the energy of this one
- This earthquake M 2.2 about 56 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 40.5368, -124.3255. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Humboldt County, CA | 39 km (24 mi) | WSW of here | earthquakes near Humboldt County |
| Trinity County, CA | 103 km (64 mi) | W of here | earthquakes near Trinity 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.
- 1.6 18km SE of Petrolia, CA
- 1.7 8km SW of Ferndale, CA
- 1.7 5km SE of Ferndale, CA
- 3.7 12km WSW of Ferndale, CA
- 3.2 3km ESE of Fortuna, CA
- 1.8 15km WSW of Petrolia, CA
- 2.5 3km ESE of Ferndale, CA
- 2.7 9km SE of Rio Dell, CA
- 2.5 28km WNW of Petrolia, CA
- 2.9 15km WSW of Ferndale, CA
- 2.1 21km W of Petrolia, CA
- 1.9 8km WNW of Rio Dell, CA
- 1.9 14km WSW of Ferndale, CA
- 1.8 14km WSW of Ferndale, CA
- 2.1 7km NNE of Hydesville, 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 2,100,000 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.