Earthquake · reviewed by a seismologist
M 2.2md
Earthquake near Hayfork, CA
USGS: 11 km ESE of Hayfork, California
59 km (37 mi) W of Redding, CA · 135 km (84 mi) NW of Chico, CA
- When
- 7:52 am PDT on 16 October 2017 ()
- Where
- 11 km (7 mi) ESE of Hayfork, CA · earthquakes near Hayfork
- Magnitude
- M 2.2 (md)
- Depth
- 33 km below the surface
- Felt
- no reports yet
- Nearest
- Trinity County, 16 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3273 days ago
A magnitude 2.2 earthquake was recorded 11 km (7 mi) ESE of Hayfork, CA, at 7:52 am PDT on 16 October 2017 (14:52 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Weaverville.
How big was it?
This earthquake released about 58 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 5.8 260,000× the energy of this one
- Magna, Utah 2020 M 5.7 180,000× the energy of this one
- Around the size people start to feel M 3.0 16× the energy of this one
- This earthquake M 2.2 about 58 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 2,800 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.5 33 km NW of Rancho Tehama Reserve, California · 46 km SE 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 40.5115, -123.0593. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Trinity County, CA | 16 km (10 mi) | NNW | earthquakes near Trinity County |
| Humboldt County, CA | 76 km (47 mi) | WNW | earthquakes near Humboldt County |
| Tehama County, CA | 82 km (51 mi) | ESE | earthquakes near Tehama County |
| Shasta County, CA | 90 km (56 mi) | ENE | earthquakes near Shasta County |
| Glenn County, CA | 116 km (72 mi) | SSE | earthquakes near Glenn County |
| Siskiyou County, CA | 128 km (79 mi) | NNE | earthquakes near Siskiyou 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.
- 2.6 19km NNW of Hayfork, CA
- 1.9 29km W of Hayfork, CA
- 1.9 31km W of Hayfork, CA
- 1.7 30km W of Hayfork, CA
- 2.0 34km SW of Hayfork, CA
- 2.0 14km WNW of Hayfork, CA
- 1.9 30km SW of Hayfork, CA
- 1.9 23km NNW of Hayfork, CA
- 1.6 29km NNW of Hayfork, CA
- 1.8 19km SSE of Hayfork, CA
- 1.9 36km SSE of Hayfork, 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
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.