Earthquake · reviewed by a seismologist
M 2.1md
17 km ENE of Willow Creek, CA
- When
- Magnitude
- M 2.1 (md)
- Depth
- 26 km below the surface
- Felt
- no reports yet
- Nearest
- Trinity County, 47 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 42 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 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
- Magna, Utah 2020 M 5.7 270,000× the energy of this one
- Around the size people start to feel M 3.0 24× the energy of this one
- This earthquake M 2.1 about 40 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 40.9890, -123.4357. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Trinity County, CA | 47 km (29 mi) | NW of here | earthquakes near Trinity County |
| Humboldt County, CA | 52 km (32 mi) | NE of here | earthquakes near Humboldt County |
| Del Norte County, CA | 96 km (60 mi) | SSE of here | earthquakes near Del Norte County |
| Siskiyou County, CA | 101 km (63 mi) | SW of here | earthquakes near Siskiyou County |
| Shasta County, CA | 120 km (74 mi) | WNW of here | earthquakes near Shasta County |
| Tehama County, CA | 140 km (87 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
6 earthquakes have been recorded within 50 km since this one.
- 2.0 12 km NW of Hayfork, CA
- 1.9 16 km SSE of Willow Creek, CA
- 1.9 12 km ESE of Willow Creek, CA
- 2.2 10 km NNW of Willow Creek, CA
- 1.9 16 km E of Willow Creek, CA
- 2.5 28 km NW of Weaverville, 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 12,000 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.