Earthquake · reviewed by a seismologist
M 1.8md
10km NNE of Windsor, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- 6.7 km below the surface
- Felt
- no reports yet
- Nearest
- Sonoma County, 18 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1846 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 14 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 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 760,000× the energy of this one
- Around the size people start to feel M 3.0 68× the energy of this one
- This earthquake M 1.8 about 14 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 38.6195, -122.7580. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Sonoma County, CA | 18 km (11 mi) | NE of here | earthquakes near Sonoma County |
| Napa County, CA | 40 km (25 mi) | WNW of here | earthquakes near Napa County |
| Lake County, CA | 54 km (34 mi) | S of here | earthquakes near Lake County |
| Marin County, CA | 63 km (39 mi) | N of here | earthquakes near Marin County |
| Yolo County, CA | 75 km (46 mi) | W of here | earthquakes near Yolo County |
| Colusa County, CA | 77 km (48 mi) | SW of here | earthquakes near Colusa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 1.8 4km NW of The Geysers, CA
- 2.2 8km NW of The Geysers, CA
- 1.5 8km NW of The Geysers, CA
- 1.8 10km WNW of The Geysers, CA
- 2.1 5km WNW of Cobb, CA
- 1.7 8km W of Cobb, CA
- 1.7 4km W of Cobb, CA
- 1.5 9km NE of Santa Rosa, CA
- 1.5 5km WNW of The Geysers, CA
- 1.9 10km NW of The Geysers, CA
- 1.6 2km N of The Geysers, CA
- 1.5 1km NNW of The Geysers, CA
- 1.9 3km SSW of Anderson Springs, CA
- 1.5 1km E of The Geysers, CA
- 1.8 2km SSW of Cobb, 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 5.0 on 2016-12-14 — it released about 70,000 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.