QuakeIndex

Earthquake · automatic estimate, may change

M 1.8md

Earthquake near Westhaven-Moonstone, CA

No earthquake was likely felt in Westhaven-Moonstone in the 24 hours to 12:00 am PST (08:00 UTC). The last one was M 5.0, 144 km (89 mi) WSW, at 8:56 pm PST on 4 November 2026, estimated intensity II (weak) in town; 145 felt reports to USGS. Every earthquake near Westhaven-Moonstone

This page: a magnitude 1.8 earthquake was recorded 8 km (5 mi) east-southeast of Westhaven-Moonstone, CA, at 3:30 pm PST on 11 December 2025 (23:30 UTC), 13 km deep. 1 person has reported feeling it to USGS. The magnitude and location are an automatic first estimate and may change.

USGS: 8 km ESE of Westhaven-Moonstone, CA

3:30 pm PST, Dec 11, 2025 · · 13 km deep · released about 14 lb of TNT

Every earthquake near Westhaven-Moonstone Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 36 kmDel Norte County 81 kmTrinity County 86 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
3:30 pm PST on 11 December 2025 ()
Where
8 km (5 mi) east-southeast of Westhaven-Moonstone, CA · earthquakes near Westhaven-Moonstone
Magnitude
M 1.8 (md)
Depth
13 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Humboldt County, 36 km SSE
Nearest mapped fault
Bald Mountain-Big Lagoon fault, 3 km from its surface trace — near is not the same as on
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 336 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 4 km (2 mi) from the epicentre. In Westhaven-Moonstone, 8 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: McKinleyville, Blue Lake, Arcata, Bayside, Eureka, Myrtletown.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 4.8 on 2016-07-21 — about 35,000 times the energy of this one.

Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.2 The 1980 Eureka, California Earthquake · 23 km WNW of this epicentre
  2. 6.5 The 1932 Eureka, California Earthquake · 40 km SW of this epicentre
  3. 6.4 Northwest of Eureka, California · 41 km W of this epicentre
  4. 6.4 The 1954 Eureka-Arcata, California Earthquake · 22 km SSE of this epicentre
  5. 5.8 Near Eureka, California · 25 km S 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 41.0215, -124.0110. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Humboldt County, CA 36 km (22 mi) SSE earthquakes near Humboldt County
Del Norte County, CA 81 km (50 mi) N earthquakes near Del Norte County
Trinity County, CA 86 km (53 mi) ESE earthquakes near Trinity County

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

Aftershocks so far

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

  1. 1.8 14 km W of Bayview, CA
  2. 2.0 19 km SSE of Blue Lake, CA
  3. 1.9 5 km SSW of Humboldt Hill, CA
  4. 3.0 23 km NE of Hydesville, CA
  5. 2.8 5 km NE of Hydesville, CA
  6. 2.5 12 km W of Bayview, CA
  7. 1.9 16 km SSE of Willow Creek, CA
  8. 1.9 12 km ESE of Willow Creek, CA
  9. 2.2 10 km NNW of Willow Creek, CA
  10. 2.2 14 km W of Bayview, CA
  11. 2.4 20 km SE of Klamath, CA
  12. 1.6 11 km NE of Blue Lake, CA
  13. 2.0 13 km E of Willow Creek, CA
  14. 2.6 3 km ESE of Fortuna, CA
  15. 2.3 3 km NW of Eureka, 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.