Earthquake · reviewed by a seismologist
M 4.2mwr
Earthquake near Kalifornsky, AK
No earthquake was likely felt in Kalifornsky in the 24 hours to 2:26 pm AKST (23:26 UTC). The last one was M 4.3, 31 km (20 mi) SE, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Kalifornsky
This page: a magnitude 4.2 earthquake was recorded 48 km (30 mi) south-southwest of Kalifornsky, AK, at 11:54 am AKDT on 26 April 2025 (19:54 UTC), 62 km deep. 220 people have reported feeling it to USGS.
USGS: 3 km WSW of Ninilchik, Alaska
- When
- 11:54 am AKDT on 26 April 2025 ()
- Where
- 48 km (30 mi) south-southwest of Kalifornsky, AK · earthquakes near Kalifornsky
- Magnitude
- M 4.2 (mwr)
- Depth
- 62 km below the surface
- Felt
- 220 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- USGS impact alert
- green
- Tsunami
- USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
- Nearest
- Kenai Peninsula Borough, 48 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 490 days ago
Earthquake alerts for Kalifornsky, AK
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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 light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 94 km (58 mi) from the epicentre. In Kalifornsky, 48 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.
Likely felt in: Anchor Point 30 km, intensity II · Fritz Creek 42 km, intensity II · Diamond Ridge 42 km, intensity II · Homer 46 km, intensity II · Kalifornsky 48 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 5,600× the energy of this one
- Mineral, Virginia 2011 M 5.8 250× the energy of this one
- Magna, Utah 2020 M 5.7 180× the energy of this one
- This earthquake M 4.2 about 30 tons of TNT
- Around the size people start to feel M 3.0 this one released 63× more
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 5.4 on 2023-03-19 — about 63 times the energy of this one.
Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 16 km WNW of Happy Valley, Alaska · 16 km WSW of this epicentre
- 5.9 13 km N of Fox River, Alaska · 43 km E of this epicentre
- 5.8 23 km WNW of Happy Valley, Alaska · 22 km W of this epicentre
- 5.6 7 km SE of Fritz Creek, Alaska · 50 km SE of this epicentre
- 5.5 13 km NW of Happy Valley, Alaska · 11 km WSW 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 60.0437, -151.7327. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kenai Peninsula Borough, AK | 48 km (30 mi) | NW | earthquakes near Kenai Peninsula Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 1.6 23 km WNW of Ninilchik, Alaska
- 1.6 5 km E of Ninilchik, Alaska
- 1.6 27 km W of Happy Valley, Alaska
- 2.1 19 km WNW of Happy Valley, Alaska
- 1.6 32 km NW of Ninilchik, Alaska
- 1.9 5 km ESE of Happy Valley, Alaska
- 1.7 21 km W of Anchor Point, Alaska
- 1.9 4 km WSW of Happy Valley, Alaska
- 2.4 23 km W of Happy Valley, Alaska
- 2.1 8 km WNW of Happy Valley, Alaska
- 1.6 17 km W of Anchor Point, Alaska
- 2.0 16 km E of Ninilchik, Alaska
- 1.7 13 km WSW of Homer, Alaska
- 1.8 17 km NW of Happy Valley, Alaska
- 1.5 4 km SSE of Ninilchik, Alaska
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.