Earthquake · reviewed by a seismologist
M 2.8md
10km WNW of The Geysers, CA
- When
- Magnitude
- M 2.8 (md)
- Depth
- 2.9 km below the surface
- Felt
- 5 reports · strongest reported intensity III
- Nearest
- Lake County, 33 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1723 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.
How big was it?
This earthquake released about 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
- Magna, Utah 2020 M 5.7 25,000× the energy of this one
- Around the size people start to feel M 3.0 2.2× the energy of this one
- This earthquake M 2.8 about 430 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 38.8253, -122.8557. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Lake County, CA | 33 km (20 mi) | SSW of here | earthquakes near Lake County |
| Sonoma County, CA | 34 km (21 mi) | N of here | earthquakes near Sonoma County |
| Napa County, CA | 58 km (36 mi) | NW of here | earthquakes near Napa County |
| Colusa County, CA | 66 km (41 mi) | SW of here | earthquakes near Colusa County |
| Yolo County, CA | 84 km (52 mi) | WNW of here | earthquakes near Yolo County |
| Mendocino County, CA | 84 km (52 mi) | SE of here | earthquakes near Mendocino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 2.1 6km W of Cobb, CA
- 2.5 13km W of Lakeport, CA
- 1.6 3km SE of The Geysers, CA
- 1.5 8km NW of The Geysers, CA
- 1.9 3km SSW of Cobb, CA
- 1.8 6km NNW of The Geysers, CA
- 1.7 1km NNE of Kelseyville, CA
- 1.5 7km W of Cobb, CA
- 1.7 18km ENE of Nice, CA
- 2.4 3km NW of Cobb, CA
- 3.1 4km NW of Cobb, CA
- 1.7 7km WNW of Cobb, CA
- 1.8 1km NNW of The Geysers, CA
- 1.7 4km W of Cobb, CA
- 1.5 7km NW 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 5.0 on 2016-12-14 — it released about 2,300 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.