Earthquake · reviewed by a seismologist
M 1.9md
3km SSW of Redwood Valley, CA
- When
- Magnitude
- M 1.9 (md)
- Depth
- 6.4 km below the surface
- Felt
- 3 reports · strongest reported intensity II
- Nearest
- Mendocino County, 29 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2561 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.
How big was it?
This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- This earthquake M 1.9 about 21 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 39.2360, -123.2132. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Mendocino County, CA | 29 km (18 mi) | SE of here | earthquakes near Mendocino County |
| Lake County, CA | 43 km (27 mi) | WNW of here | earthquakes near Lake County |
| Glenn County, CA | 81 km (50 mi) | WSW of here | earthquakes near Glenn County |
| Sonoma County, CA | 83 km (51 mi) | NNW of here | earthquakes near Sonoma County |
| Colusa County, CA | 84 km (52 mi) | W of here | earthquakes near Colusa County |
| Napa County, CA | 112 km (69 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
17 earthquakes have been recorded within 50 km since this one.
- 2.2 9km ESE of Redwood Valley, CA
- 1.9 4km NW of Redwood Valley, CA
- 1.9 10km NNW of Redwood Valley, CA
- 1.9 5km E of Boonville, CA
- 1.5 16km NE of Brooktrails, CA
- 1.9 13km SW of Lakeport, CA
- 1.6 13km SSE of Lake Pillsbury, CA
- 1.8 21km NE of Sea Ranch, CA
- 1.7 14km NE of Upper Lake, CA
- 1.9 18km NE of Upper Lake, CA
- 1.5 7km E of Redwood Valley, CA
- 1.8 14km NNE of Brooktrails, CA
- 2.5 16km ESE of Navarro Head, CA
- 1.8 16km ESE of Navarro Head, CA
- 1.7 16km ESE of Navarro Head, 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 61,000 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.