QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Rio Dell, CA

No earthquake was likely felt in Rio Dell in the 24 hours to 11:06 pm PST (07:06 UTC). The last one was M 5.0, 126 km (78 mi) W, at 8:56 pm PST on 4 November 2026, estimated intensity II (weak) in town; 145 felt reports to USGS. Every earthquake near Rio Dell

This page: a magnitude 3.0 earthquake was recorded 27 km (17 mi) east-southeast of Rio Dell, CA, at 9:35 pm PST on 10 November 2024 (05:35 UTC), 30 km deep. 9 people have reported feeling it to USGS.

USGS: 27 km SE of Rio Dell, CA

9:35 pm PST, Nov 10, 2024 · · 30 km deep · released about 920 lb of TNT

Every earthquake near Rio Dell Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 36 kmTrinity County 66 kmMendocino 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
9:35 pm PST on 10 November 2024 ()
Where
27 km (17 mi) east-southeast of Rio Dell, CA · earthquakes near Rio Dell
Magnitude
M 3.0 (md)
Depth
30 km below the surface
Felt
9 reports · strongest reported intensity III
Nearest
Humboldt County, 36 km NNW
Nearest mapped fault
Little Salmon fault, 8 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 655 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Rio Dell, 27 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Hydesville.

How big was it?

This earthquake released about 920 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 370,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 920 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.

For this area

The largest earthquake within 50 km since 2016 was M 6.2 on 2021-12-20 — about 65,000 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.2 The 1992 Petrolia, California Earthquake · 35 km W of this epicentre
  2. 6.0 Near Rio Dell, California · 34 km WNW of this epicentre
  3. 6.0 31 km NW of Shelter Cove, California · 46 km WSW of this epicentre
  4. 6.0 30 km SSW of Scotia, California · 42 km WSW of this epicentre
  5. 5.8 Near Eureka, California · 48 km NNW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 40.3935, -123.8250. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Humboldt County, CA 36 km (22 mi) NNW earthquakes near Humboldt County
Trinity County, CA 66 km (41 mi) ENE earthquakes near Trinity County
Mendocino County, CA 112 km (69 mi) SSE earthquakes near Mendocino County

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

Aftershocks so far

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

  1. 1.5 31 km E of Redway, CA
  2. 2.6 31 km W of Hayfork, CA
  3. 3.1 7 km SW of Fortuna, CA
  4. 2.3 7 km SW of Fortuna, CA
  5. 2.1 25 km NNE of Redway, CA
  6. 1.8 1 km NNW of Redway, CA
  7. 1.7 18 km SSE of Petrolia, CA
  8. 1.5 7 km WNW of Redway, CA
  9. 1.9 4 km NW of Redway, CA
  10. 2.2 1 km SW of Humboldt Hill, CA
  11. 2.1 6 km N of Petrolia, CA
  12. 1.7 11 km SE of Redway, CA
  13. 1.5 4 km of Redway, CA
  14. 2.3 16 km WSW of Hayfork, CA
  15. 1.8 5 km W of Petrolia, 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.

On USGS

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