Earthquake · reviewed by a seismologist
M 2.9md
11km SE of Weitchpec, CA
- When
- Magnitude
- M 2.9 (md)
- Depth
- 31 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Humboldt County, 52 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2369 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 700 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
- Magna, Utah 2020 M 5.7 15,000× the energy of this one
- Around the size people start to feel M 3.0 1.4× the energy of this one
- This earthquake M 2.9 about 700 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 41.1097, -123.6197. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Humboldt County, CA | 52 km (32 mi) | NNE of here | earthquakes near Humboldt County |
| Trinity County, CA | 67 km (41 mi) | NW of here | earthquakes near Trinity County |
| Del Norte County, CA | 77 km (48 mi) | SSE of here | earthquakes near Del Norte County |
| Siskiyou County, CA | 105 km (65 mi) | WSW of here | earthquakes near Siskiyou County |
| Tehama County, CA | 160 km (100 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
53 earthquakes have been recorded within 50 km since this one.
- 2.4 11km WSW of Willow Creek, CA
- 2.6 5km SW of Somes Bar, CA
- 2.2 24km NW of Hayfork, CA
- 2.8 7km W of Weitchpec, CA
- 2.9 29km ENE of Willow Creek, CA
- 2.3 10km SE of Willow Creek, CA
- 1.8 11km SSE of Blue Lake, CA
- 2.2 9km ESE of Willow Creek, CA
- 2.4 21km SSE of Willow Creek, CA
- 2.5 16km SSE of Somes Bar, CA
- 2.5 8km E of Willow Creek, CA
- 2.0 18km ESE of Willow Creek, CA
- 2.3 20km ENE of Willow Creek, CA
- 2.3 18km E of Willow Creek, CA
- 2.4 12km SE of Weitchpec, 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 710 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.