Earthquake · reviewed by a seismologist
M 2.4md
9km W of Petrolia, CA
- When
- Magnitude
- M 2.4 (md)
- Depth
- 30 km below the surface
- Felt
- no reports yet
- Nearest
- Humboldt County, 58 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1510 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 130 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 5.8 110,000× the energy of this one
- Magna, Utah 2020 M 5.7 80,000× the energy of this one
- Around the size people start to feel M 3.0 7.2× the energy of this one
- This earthquake M 2.4 about 130 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 40.3240, -124.3930. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Humboldt County, CA | 58 km (36 mi) | SW of here | earthquakes near Humboldt County |
| Trinity County, CA | 114 km (71 mi) | WSW of here | earthquakes near Trinity County |
| Mendocino County, CA | 128 km (80 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
53 earthquakes have been recorded within 50 km since this one.
- 2.5 30km W of Petrolia, CA
- 2.1 18km WNW of Ferndale, CA
- 1.7 4km NNW of Redway, CA
- 2.5 12km WSW of Petrolia, CA
- 2.8 12km WSW of Petrolia, CA
- 1.6 11km WNW of Petrolia, CA
- 3.7 7km WSW of Petrolia, CA
- 1.8 13km NW of Petrolia, CA
- 4.1 3km SSE of Fortuna, CA
- 2.2 3km NW of Ferndale, CA
- 1.9 6km NNE of Hydesville, CA
- 2.6 5km NNE of Hydesville, CA
- 2.7 7km N of Petrolia, CA
- 1.9 24km WNW of Petrolia, CA
- 2.4 43km WNW 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.
For this area
The largest earthquake within 50 km in our catalogue was M 6.2 on 2021-12-20 — it released about 450,000 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.