Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Westhaven-Moonstone, CA
No earthquake was likely felt in Westhaven-Moonstone in the 24 hours to 3:44 pm PST (23:44 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 2.1 earthquake was recorded 12 km (8 mi) north-northeast of Westhaven-Moonstone, CA, at 12:05 am PDT on 30 June 2025 (07:05 UTC), 20 km deep. 1 person has reported feeling it to USGS.
USGS: 12 km NE of Westhaven-Moonstone, CA
- When
- 12:05 am PDT on 30 June 2025 ()
- Where
- 12 km (8 mi) north-northeast of Westhaven-Moonstone, CA · earthquakes near Westhaven-Moonstone
- Magnitude
- M 2.1 (md)
- Depth
- 20 km below the surface
- Felt
- 1 report · strongest reported intensity III
- Nearest
- Humboldt County, 48 km S
- Nearest mapped fault
- Bald Mountain-Big Lagoon fault, under 1 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 493 days ago
Earthquake alerts for Westhaven-Moonstone, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. In Westhaven-Moonstone, 12 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.
How big was it?
This earthquake released about 51 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.
- Mineral, Virginia 2011 M 5.8 300,000× the energy of this one
- Magna, Utah 2020 M 5.7 210,000× the energy of this one
- Around the size people start to feel M 3.0 19× the energy of this one
- This earthquake M 2.1 about 51 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 9,800 times the energy of this one.
Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:
- 7.2 The 1980 Eureka, California Earthquake · 19 km W of this epicentre
- 6.4 Northwest of Eureka, California · 43 km WSW of this epicentre
- 6.4 The 1954 Eureka-Arcata, California Earthquake · 34 km SSE of this epicentre
- 5.8 Near Eureka, California · 37 km S of this epicentre
- 5.6 26 km NNW of Willow Creek, California · 20 km E 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 41.1358, -124.0230. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Humboldt County, CA | 48 km (30 mi) | S | earthquakes near Humboldt County |
| Del Norte County, CA | 68 km (42 mi) | N | earthquakes near Del Norte County |
| Trinity County, CA | 94 km (58 mi) | SE | earthquakes near Trinity County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
39 earthquakes have been recorded within 50 km since this one.
- 1.8 14 km W of Bayview, CA
- 2.0 19 km SSE of Blue Lake, CA
- 2.5 12 km W of Bayview, CA
- 2.2 10 km NNW of Willow Creek, CA
- 2.2 14 km W of Bayview, CA
- 2.4 20 km SE of Klamath, CA
- 1.6 11 km NE of Blue Lake, CA
- 2.3 3 km NW of Eureka, CA
- 1.9 20 km SE of Blue Lake, CA
- 2.3 4 km ENE of Trinidad, CA
- 2.5 14 km WSW of McKinleyville, CA
- 2.4 14 km WSW of McKinleyville, CA
- 2.3 13 km E of Weitchpec, CA
- 2.4 4 km ESE of Cutten, CA
- 1.8 8 km W of Arcata, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.