Earthquake · reviewed by a seismologist
M 2.3md
14km E of Angwin, CA
- When
- Magnitude
- M 2.3 (md)
- Depth
- 5.5 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Napa County, 7 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2151 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 82 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
- Magna, Utah 2020 M 5.7 130,000× the energy of this one
- Around the size people start to feel M 3.0 12× the energy of this one
- This earthquake M 2.3 about 82 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 38.5633, -122.2922. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Napa County, CA | 7 km (4 mi) | NNE of here | earthquakes near Napa County |
| Yolo County, CA | 36 km (23 mi) | WSW of here | earthquakes near Yolo County |
| Solano County, CA | 45 km (28 mi) | NW of here | earthquakes near Solano County |
| Sonoma County, CA | 55 km (34 mi) | E of here | earthquakes near Sonoma County |
| Colusa County, CA | 68 km (43 mi) | S of here | earthquakes near Colusa County |
| Marin County, CA | 69 km (43 mi) | NE of here | earthquakes near Marin County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
23 earthquakes have been recorded within 50 km since this one.
- 1.8 3km NNW of The Geysers, CA
- 1.7 4km SSW of Anderson Springs, CA
- 2.9 3km ENE of The Geysers, CA
- 1.6 3km SSW of Anderson Springs, CA
- 1.9 4km SSW of Anderson Springs, CA
- 1.9 2km W of Anderson Springs, CA
- 1.8 5km NNE of Windsor, CA
- 1.5 2km WNW of The Geysers, CA
- 2.1 1km NW of The Geysers, CA
- 2.3 5km NNE of Windsor, CA
- 1.6 1km N of The Geysers, CA
- 2.0 4km N of Larkfield-Wikiup, CA
- 1.9 7km SE of Lower Lake, CA
- 1.9 3km SE of The Geysers, CA
- 1.7 3km SE of The Geysers, 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 4.2 on 2018-01-18 — it released about 790 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.