Earthquake · reviewed by a seismologist
M 3.7mw
36 km E of Hydesville, CA
- When
- Magnitude
- M 3.7 (mw)
- Depth
- 24 km below the surface
- Felt
- 15 reports · strongest reported intensity III
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Humboldt County, 26 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 13 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 15 people have reported feeling it to USGS.
How big was it?
This earthquake released about 4.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 35,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 1,600× the energy of this one
- Magna, Utah 2020 M 5.7 1,100× the energy of this one
- This earthquake M 3.7 about 4.8 tons of TNT
- Around the size people start to feel M 3.0 this one released 10× more
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 40.5625, -123.6775. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Humboldt County, CA | 26 km (16 mi) | SE of here | earthquakes near Humboldt County |
| Trinity County, CA | 48 km (30 mi) | W of here | earthquakes near Trinity County |
| Siskiyou County, CA | 149 km (93 mi) | SW of here | earthquakes near Siskiyou County |
| Glenn County, CA | 152 km (95 mi) | NW of here | earthquakes near Glenn County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
7 earthquakes have been recorded within 50 km since this one.
- 2.2 32 km NE of Redway, CA
- 1.7 10 km SE of Rio Dell, CA
- 1.7 16 km NNW of Redway, CA
- 1.7 29 km N of Redway, CA
- 1.9 36 km E of Hydesville, CA
- 2.6 7 km E of Hydesville, CA
- 2.0 12 km NW 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.
For this area
The largest earthquake within 50 km in our catalogue was M 5.3 on 2023-01-01 — it released about 330 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.