QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

11km ESE of Redway, CA

· 23 km deep · released about 37 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 72 kmMendocino County 76 kmTrinity County 80 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
23 km below the surface
Felt
no reports yet
Nearest
Humboldt County, 72 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1548 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 37 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 5.8 410,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 290,000× the energy of this one
  3. Around the size people start to feel M 3.0 26× the energy of this one
  4. This earthquake M 2.1 about 37 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 40.0842, -123.6978. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 72 km (45 mi) SSE of here earthquakes near Humboldt County
Mendocino County, CA 76 km (47 mi) NNW of here earthquakes near Mendocino County
Trinity County, CA 80 km (50 mi) SW of here earthquakes near Trinity County
Glenn County, CA 123 km (76 mi) WNW of here earthquakes near Glenn County
Lake County, CA 136 km (84 mi) NW of here earthquakes near Lake County

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

Aftershocks so far

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

  1. 1.8 8km ESE of Redway, CA
  2. 1.7 20km NNE of Rockport, CA
  3. 1.7 4km NNW of Redway, CA
  4. 1.9 11km W of Laytonville, CA
  5. 1.7 19km NNW of Laytonville, CA
  6. 1.5 16km NNW of Laytonville, CA
  7. 4.3 36km NE of Redway, CA
  8. 1.9 27km NE of Redway, CA
  9. 1.6 31km WSW of Hayfork, CA
  10. 1.9 5km ESE of Redway, CA
  11. 1.6 4km NW of Laytonville, CA
  12. 1.5 29km NNE of Redway, CA
  13. 2.0 5km NNW of Redway, CA
  14. 1.7 11km SSE of Redway, CA
  15. 2.0 9km WNW of Covelo, 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 4,400 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.