QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

14km E of Rockport, CA

· 8.0 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 37 kmLake County 104 kmGlenn County 108 kmHumboldt County 111 kmTrinity County 112 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 2.4 (md)
Depth
8.0 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Mendocino County, 37 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1358 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 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 92,000× the energy of this one
  3. Around the size people start to feel M 3.0 8.2× the energy of this one
  4. This earthquake M 2.4 about 120 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 39.7295, -123.6485. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 37 km (23 mi) NNW of here earthquakes near Mendocino County
Lake County, CA 104 km (65 mi) NW of here earthquakes near Lake County
Glenn County, CA 108 km (67 mi) W of here earthquakes near Glenn County
Humboldt County, CA 111 km (69 mi) SSE of here earthquakes near Humboldt County
Trinity County, CA 112 km (69 mi) SSW of here earthquakes near Trinity County

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

Aftershocks so far

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

  1. 1.6 8km E of Willits, CA
  2. 1.6 10km SSW of Cape Vizcaino, CA
  3. 1.7 7km E of Willits, CA
  4. 2.0 16km WNW of Cape Vizcaino, CA
  5. 1.6 5km SE of Willits, CA
  6. 1.8 17km SSE of Shelter Cove, CA
  7. 1.8 18km SSE of Shelter Cove, CA
  8. 1.5 8km ESE of Willits, CA
  9. 1.7 2km NNW of Redway, CA
  10. 2.0 9km NNE of Brooktrails, CA
  11. 1.9 21km ENE of Brooktrails, CA
  12. 1.9 4km NNW of Redway, CA
  13. 1.7 7km E of Willits, CA
  14. 1.8 5km ESE of Redway, CA
  15. 2.0 19km W of Cape Vizcaino, 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 640 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.