Earthquake · reviewed by a seismologist
M 2.2md
Earthquake near Weaverville, CA
USGS: 11 km W of Junction City, California
- When
- 1:26 pm PDT on 19 September 2017 ()
- Where
- 21 km (13 mi) W of Weaverville, CA · earthquakes near Weaverville
- Magnitude
- M 2.2 (md)
- Depth
- 32 km below the surface
- Felt
- no reports yet
- Nearest
- Trinity County, 13 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3299 days ago
A magnitude 2.2 earthquake was recorded 21 km (13 mi) W of Weaverville, CA, at 1:26 pm PDT on 19 September 2017 (20:26 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Hayfork.
How big was it?
This earthquake released about 64 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 5.8 230,000× the energy of this one
- Magna, Utah 2020 M 5.7 170,000× the energy of this one
- Around the size people start to feel M 3.0 15× the energy of this one
- This earthquake M 2.2 about 64 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.
For this area
The largest earthquake within 50 km since 2016 was M 4.5 on 2016-08-28 — about 2,500 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.6 15 km SW of Burnt Ranch, California · 36 km W of this epicentre
- 5.4 3 km NNW of Burnt Ranch, California · 27 km WNW of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 40.7440, -123.1942. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Trinity County, CA | 13 km (8 mi) | SSE | earthquakes near Trinity County |
| Humboldt County, CA | 62 km (38 mi) | W | earthquakes near Humboldt County |
| Shasta County, CA | 97 km (60 mi) | E | earthquakes near Shasta County |
| Tehama County, CA | 107 km (66 mi) | SE | earthquakes near Tehama County |
| Siskiyou County, CA | 109 km (68 mi) | NNE | earthquakes near Siskiyou County |
| Del Norte County, CA | 130 km (81 mi) | NNW | earthquakes near Del Norte County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 3.3 14km ESE of Willow Creek, CA
- 2.3 20km ENE of Willow Creek, CA
- 2.0 14km WNW of Hayfork, CA
- 1.9 30km SW of Hayfork, CA
- 1.9 23km NNW of Hayfork, CA
- 3.4 6km NE of Willow Creek, CA
- 1.6 29km NNW of Hayfork, CA
- 1.8 19km SSE of Hayfork, CA
- 2.1 22km SSW of Willow Creek, CA
- 1.9 28km W of Hayfork, CA
- 2.5 29km W of Hayfork, CA
- 2.3 17km ESE of Hayfork, CA
- 2.5 25km W of Hayfork, CA
- 2.9 25km E of Weitchpec, CA
- 2.5 31km SSE of Somes Bar, 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.
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.