Earthquake · reviewed by a seismologist
M 1.5md
4km N of Upper Lake, CA
- When
- Magnitude
- M 1.5 (md)
- Depth
- 9.7 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 18 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3081 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 39.2025, -122.9143. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Lake County, CA | 18 km (11 mi) | NW of here | earthquakes near Lake County |
| Mendocino County, CA | 52 km (32 mi) | ESE of here | earthquakes near Mendocino County |
| Colusa County, CA | 58 km (36 mi) | W of here | earthquakes near Colusa County |
| Glenn County, CA | 63 km (39 mi) | SW of here | earthquakes near Glenn County |
| Sonoma County, CA | 75 km (47 mi) | N of here | earthquakes near Sonoma County |
| Napa County, CA | 93 km (58 mi) | NNW of here | earthquakes near Napa 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.
- 1.6 3km W of Cobb, CA
- 1.7 8km SE of Lake Pillsbury, CA
- 1.7 6km WNW of The Geysers, CA
- 1.8 6km WNW of Cobb, CA
- 1.5 6km NW of The Geysers, CA
- 2.6 6km WNW of Cobb, CA
- 1.8 11km NNE of Redwood Valley, CA
- 2.8 7km WNW of The Geysers, CA
- 1.5 5km NNW of The Geysers, CA
- 2.1 6km W of Cobb, CA
- 3.0 19km NE of Upper Lake, CA
- 1.7 6km NW of The Geysers, CA
- 1.8 7km WNW of The Geysers, CA
- 1.6 7km NW of The Geysers, CA
- 1.9 3km WNW of Lower Lake, 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 5.1 on 2016-08-10 — it released about 240,000 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.