Earthquake · reviewed by a seismologist
M 1.8md
15km ESE of Angwin, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- 5.8 km below the surface
- Felt
- no reports yet
- Nearest
- Napa County, 5 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2752 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 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
- Magna, Utah 2020 M 5.7 640,000× the energy of this one
- Around the size people start to feel M 3.0 57× the energy of this one
- This earthquake M 1.8 about 17 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 38.5358, -122.2878. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Napa County, CA | 5 km (3 mi) | NE of here | earthquakes near Napa County |
| Yolo County, CA | 37 km (23 mi) | WSW of here | earthquakes near Yolo County |
| Solano County, CA | 43 km (26 mi) | NW of here | earthquakes near Solano County |
| Sonoma County, CA | 56 km (35 mi) | E of here | earthquakes near Sonoma County |
| Marin County, CA | 67 km (42 mi) | NE of here | earthquakes near Marin County |
| Colusa County, CA | 72 km (44 mi) | S of here | earthquakes near Colusa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
18 earthquakes have been recorded within 50 km since this one.
- 1.6 3km NE of The Geysers, CA
- 1.9 13km NNE of Angwin, CA
- 2.1 2km SSW of Cobb, CA
- 1.5 2km W of Anderson Springs, CA
- 2.1 3km SE of The Geysers, CA
- 1.5 1km NW of The Geysers, CA
- 1.7 2km E of The Geysers, CA
- 1.6 2km N of The Geysers, CA
- 2.2 2km NNE of The Geysers, CA
- 2.4 3km SSW of Anderson Springs, CA
- 1.6 4km SSW of Anderson Springs, CA
- 1.9 2km WSW of Anderson Springs, CA
- 1.9 1km NNW of The Geysers, CA
- 2.2 1km NNW of The Geysers, CA
- 1.5 6km ENE of Santa Rosa, 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 3,800 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.