Earthquake · reviewed by a seismologist
M 2.5md
8km E of Willow Creek, CA
- When
- Magnitude
- M 2.5 (md)
- Depth
- 26 km below the surface
- Felt
- no reports yet
- Nearest
- Humboldt County, 42 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1717 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 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 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 75,000× the energy of this one
- Around the size people start to feel M 3.0 6.7× the energy of this one
- This earthquake M 2.5 about 140 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 40.9413, -123.5297. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Humboldt County, CA | 42 km (26 mi) | NE of here | earthquakes near Humboldt County |
| Trinity County, CA | 48 km (30 mi) | NW of here | earthquakes near Trinity County |
| Del Norte County, CA | 97 km (61 mi) | SSE of here | earthquakes near Del Norte County |
| Siskiyou County, CA | 110 km (68 mi) | SW of here | earthquakes near Siskiyou County |
| Tehama County, CA | 142 km (88 mi) | NW of here | earthquakes near Tehama County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
50 earthquakes have been recorded within 50 km since this one.
- 2.1 36km W of Hayfork, CA
- 2.5 24km SE of Blue Lake, CA
- 2.1 28km WNW of Hayfork, CA
- 2.3 15km E of Willow Creek, CA
- 1.9 18km ENE of Hydesville, CA
- 2.4 17km ENE of Willow Creek, CA
- 1.8 20km SSE of Willow Creek, CA
- 2.1 25km WNW of Weaverville, CA
- 2.0 7km W of Willow Creek, CA
- 2.4 14km E of Willow Creek, CA
- 2.3 28km ENE of Willow Creek, CA
- 1.7 31km W of Hayfork, CA
- 2.1 26km ESE of Willow Creek, CA
- 2.4 7km S of Somes Bar, CA
- 2.3 14km SE of Bayside, 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 4.8 on 2016-07-21 — it released about 3,500 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.