Earthquake · reviewed by a seismologist
M 3.0md
21km NNW of Boonville, CA
- When
- Magnitude
- M 3.0 (md)
- Depth
- 5.9 km below the surface
- Felt
- 41 reports · strongest reported intensity IV
- Nearest
- Mendocino County, 28 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2129 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 41 people have reported feeling it to USGS.
How big was it?
This earthquake released about 800 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 420,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 19,000× the energy of this one
- Magna, Utah 2020 M 5.7 13,000× the energy of this one
- This earthquake M 3.0 about 800 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 39.1842, -123.4570. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Mendocino County, CA | 28 km (17 mi) | S of here | earthquakes near Mendocino County |
| Lake County, CA | 62 km (39 mi) | W of here | earthquakes near Lake County |
| Sonoma County, CA | 87 km (54 mi) | NNW of here | earthquakes near Sonoma County |
| Glenn County, CA | 102 km (63 mi) | WSW of here | earthquakes near Glenn County |
| Colusa County, CA | 105 km (65 mi) | W of here | earthquakes near Colusa County |
| Napa County, CA | 124 km (77 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
57 earthquakes have been recorded within 50 km since this one.
- 2.8 10km ESE of Willits, CA
- 1.5 11km ESE of Redwood Valley, CA
- 2.3 11km ESE of Willits, CA
- 2.1 10km ESE of Willits, CA
- 1.9 11km NNW of Redwood Valley, CA
- 1.8 10km ESE of Willits, CA
- 2.7 11km ESE of Willits, CA
- 1.6 10km ESE of Willits, CA
- 1.9 10km ESE of Willits, CA
- 1.6 10km ESE of Willits, CA
- 3.4 10km ESE of Willits, CA
- 3.8 11km ESE of Willits, CA
- 1.6 11km W of Lakeport, CA
- 1.6 11km ESE of Willits, CA
- 1.8 10km ESE of Willits, 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 4.3 on 2019-04-29 — 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.