Earthquake · reviewed by a seismologist
M 1.8md
4km SSE of Lake Pillsbury, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- 2.2 km below the surface
- Felt
- 5 reports · strongest reported intensity III
- Nearest
- Lake County, 34 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2794 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 5 people have reported feeling it to USGS.
How big was it?
This earthquake released about 13 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 1,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 840,000× the energy of this one
- Around the size people start to feel M 3.0 75× the energy of this one
- This earthquake M 1.8 about 13 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 39.3755, -122.9395. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Lake County, CA | 34 km (21 mi) | NNW of here | earthquakes near Lake County |
| Mendocino County, CA | 44 km (27 mi) | E of here | earthquakes near Mendocino County |
| Glenn County, CA | 53 km (33 mi) | WSW of here | earthquakes near Glenn County |
| Colusa County, CA | 64 km (40 mi) | WNW of here | earthquakes near Colusa County |
| Sonoma County, CA | 95 km (59 mi) | N of here | earthquakes near Sonoma County |
| Tehama County, CA | 103 km (64 mi) | SW of here | earthquakes near Tehama County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.8 9km ESE of Willits, CA
- 1.9 11km NNW of Redwood Valley, CA
- 1.8 17km SE of Lake Pillsbury, CA
- 2.0 11km NNW of Redwood Valley, CA
- 1.8 11km N of Redwood Valley, CA
- 1.9 16km SE of Lake Pillsbury, CA
- 1.7 12km WSW of Kelseyville, CA
- 1.8 10km NNW of Redwood Valley, CA
- 1.7 11km NNW of Redwood Valley, CA
- 2.0 11km NNW of Redwood Valley, CA
- 1.7 11km NNW of Redwood Valley, CA
- 1.8 13km SE of Lake Pillsbury, CA
- 1.9 10km NNW of Redwood Valley, CA
- 1.7 14km WSW of Lakeport, CA
- 2.0 11km NNW of Redwood Valley, 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 100,000 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.