QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

12km SSE of Redway, CA

· 19 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 71 kmHumboldt County 77 kmTrinity County 88 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 2.8 (md)
Depth
19 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Mendocino County, 71 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1653 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 40.0278, -123.7545. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 71 km (44 mi) NNW of here earthquakes near Mendocino County
Humboldt County, CA 77 km (48 mi) S of here earthquakes near Humboldt County
Trinity County, CA 88 km (55 mi) SW of here earthquakes near Trinity County
Glenn County, CA 125 km (78 mi) WNW of here earthquakes near Glenn County
Lake County, CA 134 km (83 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

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

  1. 2.1 10km SW of Laytonville, CA
  2. 1.8 5km SSE of Shelter Cove, CA
  3. 2.1 11km ESE of Redway, CA
  4. 1.9 18km NNW of Laytonville, CA
  5. 1.7 24km N of Redway, CA
  6. 1.9 8km SSE of Redway, CA
  7. 1.8 9km NE of Laytonville, CA
  8. 2.3 6km NNW of Laytonville, CA
  9. 2.0 2km N of Redway, CA
  10. 2.5 2km N of Redway, CA
  11. 1.8 25km NNE of Redway, CA
  12. 1.8 12km ESE of Redway, CA
  13. 1.7 2km NNE of Redway, CA
  14. 1.9 2km N of Redway, CA
  15. 1.9 2km N 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 4.3 on 2017-12-14 — it released about 180 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.