Earthquake · reviewed by a seismologist
M 4.4mw
13km W of Lakeport, CA
- When
- Magnitude
- M 4.4 (mw)
- Depth
- 5.0 km below the surface
- Felt
- 1174 reports · strongest reported intensity V
- Measured shaking
- intensity VI (ShakeMap)
- USGS impact alert
- green
- Tsunami
- USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
- Nearest
- Lake County, 29 km ENE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2053 days ago
This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1174 people have reported feeling it to USGS.
How big was it?
This earthquake released about 58 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.4 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 2,900× the energy of this one
- Mineral, Virginia 2011 M 5.8 130× the energy of this one
- Magna, Utah 2020 M 5.7 92× the energy of this one
- This earthquake M 4.4 about 58 tons of TNT
- Around the size people start to feel M 3.0 this one released 120× more
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 39.0377, -123.0672. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Lake County, CA | 29 km (18 mi) | WSW of here | earthquakes near Lake County |
| Mendocino County, CA | 55 km (34 mi) | SE of here | earthquakes near Mendocino County |
| Sonoma County, CA | 58 km (36 mi) | NNW of here | earthquakes near Sonoma County |
| Colusa County, CA | 73 km (46 mi) | WSW of here | earthquakes near Colusa County |
| Glenn County, CA | 85 km (53 mi) | SW of here | earthquakes near Glenn County |
| Napa County, CA | 87 km (54 mi) | NW of here | earthquakes near Napa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.9 13km W of Lakeport, CA
- 2.0 2km S of Anderson Springs, CA
- 1.9 16km W of Ukiah, CA
- 1.8 7km WNW of The Geysers, CA
- 2.8 2km NNW of The Geysers, CA
- 1.7 9km NW of The Geysers, CA
- 1.6 5km NW of The Geysers, CA
- 1.6 3km NNW of The Geysers, CA
- 1.8 3km S of Cobb, CA
- 2.2 1km WNW of The Geysers, CA
- 2.4 4km NNW of Redwood Valley, CA
- 2.0 18km NE of Sea Ranch, CA
- 1.7 18km ESE of Boonville, CA
- 1.7 7km W of Cobb, CA
- 1.5 6km 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 5.1 on 2016-08-10 — it released about 11 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.