Earthquake · reviewed by a seismologist
M 2.2md
Earthquake near Westhaven-Moonstone, CA
No earthquake was likely felt in Westhaven-Moonstone in the 24 hours to 2:28 pm PST (22:28 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 2.2 earthquake was recorded 5 km (3 mi) northeast of Westhaven-Moonstone, CA, at 12:37 am PDT on 19 October 2023 (07:37 UTC), 17 km deep.
USGS: 6 km NE of Westhaven-Moonstone, CA
- When
- 12:37 am PDT on 19 October 2023 ()
- Where
- 5 km (3 mi) northeast of Westhaven-Moonstone, CA · earthquakes near Westhaven-Moonstone
- Magnitude
- M 2.2 (md)
- Depth
- 17 km below the surface
- Felt
- no reports yet
- Nearest
- Humboldt County, 42 km SSE
- Nearest mapped fault
- Bald Mountain-Big Lagoon fault, 2 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 1117 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, people at rest would likely notice it out to about 6 km (4 mi) from the epicentre. In Westhaven-Moonstone, 5 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.
How big was it?
This earthquake released about 52 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 290,000× the energy of this one
- Magna, Utah 2020 M 5.7 200,000× the energy of this one
- Around the size people start to feel M 3.0 18× the energy of this one
- This earthquake M 2.2 about 52 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 9,400 times the energy of this one.
Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:
- 7.2 The 1980 Eureka, California Earthquake · 18 km WNW of this epicentre
- 6.5 The 1932 Eureka, California Earthquake · 43 km SSW of this epicentre
- 6.4 Northwest of Eureka, California · 39 km WSW of this epicentre
- 6.4 The 1954 Eureka-Arcata, California Earthquake · 28 km SSE of this epicentre
- 5.8 Near Eureka, California · 31 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 41.0730, -124.0488. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Humboldt County, CA | 42 km (26 mi) | SSE | earthquakes near Humboldt County |
| Del Norte County, CA | 75 km (47 mi) | N | earthquakes near Del Norte County |
| Trinity County, CA | 92 km (57 mi) | ESE | earthquakes near Trinity County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
42 earthquakes have been recorded within 50 km since this one.
- 2.0 11 km SSW of Willow Creek, CA
- 3.4 9 km ESE of Willow Creek, CA
- 2.0 14 km WNW of Willow Creek, CA
- 2.0 11 km W of Bayview, CA
- 2.1 9 km E of Willow Creek, CA
- 2.2 1 km NNE of Arcata, CA
- 2.9 14 km SE of Pine Hills, CA
- 2.3 17 km NNW of Trinidad, CA
- 2.9 13 km WNW of Bayview, CA
- 2.2 9 km SW of Humboldt Hill, CA
- 2.1 12 km NE of Westhaven-Moonstone, CA
- 2.2 17 km ESE of Pine Hills, CA
- 3.1 4 km WSW of Arcata, CA
- 2.1 4 km WNW of Humboldt Hill, CA
- 2.3 6 km WNW of Humboldt Hill, 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.