QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

32km NNW of Covelo, CA

· 8.8 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 67 kmTrinity County 73 kmHumboldt County 85 kmGlenn County 101 kmTehama County 103 kmLake County 119 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.1 (md)
Depth
8.8 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Mendocino County, 67 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2781 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 41 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 40.0390, -123.4338. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 67 km (42 mi) N of here earthquakes near Mendocino County
Trinity County, CA 73 km (45 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 85 km (53 mi) SSE of here earthquakes near Humboldt County
Glenn County, CA 101 km (63 mi) WNW of here earthquakes near Glenn County
Tehama County, CA 103 km (64 mi) W of here earthquakes near Tehama County
Lake County, CA 119 km (74 mi) NNW of here earthquakes near Lake County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

48 earthquakes have been recorded within 50 km since this one.

  1. 2.1 4km NW of Redway, CA
  2. 2.3 13km SE of Laytonville, CA
  3. 3.1 3km NW of Redway, CA
  4. 2.3 17km N of Rockport, CA
  5. 1.8 36km NE of Covelo, CA
  6. 2.6 41km S of Hayfork, CA
  7. 2.7 37km SSE of Hayfork, CA
  8. 1.5 41km NE of Covelo, CA
  9. 2.9 16km N of Redway, CA
  10. 2.0 3km NNW of Redway, CA
  11. 1.5 4km N of Redway, CA
  12. 3.2 3km NNW of Redway, CA
  13. 1.8 29km N of Redway, CA
  14. 1.7 8km ENE of Covelo, CA
  15. 1.9 9km ESE of Redway, 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 4.5 on 2016-08-28 — it released about 4,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.