Earthquake · reviewed by a seismologist
M 2.1md
12km SE of Cape Vizcaino, CA
- When
- Magnitude
- M 2.1 (md)
- Depth
- 8.8 km below the surface
- Felt
- no reports yet
- Nearest
- Mendocino County, 34 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2720 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
- Magna, Utah 2020 M 5.7 250,000× the energy of this one
- Around the size people start to feel M 3.0 22× the energy of this one
- This earthquake M 2.1 about 43 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 39.6503, -123.7262. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Mendocino County, CA | 34 km (21 mi) | NW of here | earthquakes near Mendocino County |
| Lake County, CA | 104 km (64 mi) | NW of here | earthquakes near Lake County |
| Glenn County, CA | 114 km (71 mi) | W of here | earthquakes near Glenn County |
| Humboldt County, CA | 119 km (74 mi) | S of here | earthquakes near Humboldt County |
| Trinity County, CA | 122 km (76 mi) | SSW of here | earthquakes near Trinity County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
11 earthquakes have been recorded within 50 km since this one.
- 1.6 12km N of Brooktrails, CA
- 1.9 8km NE of Willits, CA
- 2.2 9km SSE of Willits, CA
- 1.9 8km E of Willits, CA
- 1.8 7km ENE of Brooktrails, CA
- 1.8 14km NNE of Brooktrails, CA
- 1.7 15km NNE of Brooktrails, CA
- 2.4 15km N of Brooktrails, CA
- 1.6 7km NE of Brooktrails, CA
- 2.1 7km NE of Fort Bragg, CA
- 1.6 5km ESE of Laytonville, 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 2017-12-14 — it released about 1,700 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.