Earthquake · reviewed by a seismologist
M 3.7mw
3km WNW of Redwood Valley, CA
- When
- Magnitude
- M 3.7 (mw)
- Depth
- 5.5 km below the surface
- Felt
- 229 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Mendocino County, 25 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2708 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 229 people have reported feeling it to USGS.
How big was it?
This earthquake released about 5.7 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 30,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 1,300× the energy of this one
- Magna, Utah 2020 M 5.7 930× the energy of this one
- This earthquake M 3.7 about 5.7 tons of TNT
- Around the size people start to feel M 3.0 this one released 12× 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 39.2758, -123.2333. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Mendocino County, CA | 25 km (16 mi) | SE of here | earthquakes near Mendocino County |
| Lake County, CA | 46 km (29 mi) | WNW of here | earthquakes near Lake County |
| Glenn County, CA | 80 km (50 mi) | WSW of here | earthquakes near Glenn County |
| Colusa County, CA | 86 km (54 mi) | W of here | earthquakes near Colusa County |
| Sonoma County, CA | 88 km (54 mi) | NNW of here | earthquakes near Sonoma County |
| Napa County, CA | 116 km (72 mi) | NW of here | earthquakes near Napa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
30 earthquakes have been recorded within 50 km since this one.
- 2.2 18km NE of Upper Lake, CA
- 1.5 15km NE of Upper Lake, CA
- 1.6 10km N of Lake Pillsbury, CA
- 1.9 10km N of Lake Pillsbury, CA
- 1.5 10km N of Lake Pillsbury, CA
- 2.2 9km NNW of Redwood Valley, CA
- 1.7 3km WNW of Redwood Valley, CA
- 2.5 10km N of Lake Pillsbury, CA
- 1.7 18km SE of Lake Pillsbury, CA
- 1.9 13km N of Brooktrails, CA
- 1.7 19km NNW of Cloverdale, CA
- 1.8 4km NNW of Redwood Valley, CA
- 1.6 15km SE of Boonville, CA
- 1.6 7km E of Lake Pillsbury, CA
- 2.4 16km SE of Boonville, 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 5.1 on 2016-08-10 — it released about 110 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.