QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0ml

Earthquake near Kalifornsky, AK

No earthquake was likely felt in Kalifornsky in the 24 hours to 4:34 pm AKST (01:34 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 4.0 earthquake was recorded 39 km (24 mi) southeast of Kalifornsky, AK, at 6:31 am AKST on 6 March 2026 (15:31 UTC), 52 km deep. 36 people have reported feeling it to USGS.

USGS: 33 km S of Funny River, Alaska

6:31 am AKST, Mar 6, 2026 · · 52 km deep · released about 15 tons of TNT

Every earthquake near Kalifornsky Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kenai Peninsula Borough 89 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
6:31 am AKST on 6 March 2026 ()
Where
39 km (24 mi) southeast of Kalifornsky, AK · earthquakes near Kalifornsky
Magnitude
M 4.0 (ml)
Depth
52 km below the surface
Felt
36 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Kenai Peninsula Borough, 89 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 175 days ago

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 82 km (51 mi) from the epicentre. In Kalifornsky, 39 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: Soldotna 36 km, intensity II · Sterling 37 km, intensity II · Kalifornsky 39 km, intensity II · Kenai 49 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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 4.4 on 2019-01-09 — about 4 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 6.0 31 km S of Funny River, Alaska · 5 km ENE of this epicentre
  2. 6.0 6 km SSE of Fox River, Alaska · 46 km SSW of this epicentre
  3. 5.9 13 km N of Fox River, Alaska · 28 km SSW 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 60.2020, -150.7330. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 89 km (56 mi) WNW earthquakes near Kenai Peninsula Borough
Anchorage Municipality, AK 134 km (83 mi) NE earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 2.5 8 km ESE of Kalifornsky, Alaska
  2. 1.6 17 km SE of Kasilof, Alaska
  3. 1.7 8 km E of Clam Gulch, Alaska
  4. 1.8 13 km S of Funny River, Alaska
  5. 1.8 15 km SE of Kasilof, Alaska
  6. 1.7 8 km SSE of Fox River, Alaska
  7. 2.1 22 km ESE of Clam Gulch, Alaska
  8. 1.6 9 km NNW of Fox River, Alaska
  9. 1.7 15 km SSE of Funny River, Alaska
  10. 1.6 19 km ESE of Kasilof, Alaska
  11. 2.7 35 km ENE of Fox River, Alaska
  12. 1.7 5 km NNW of Ridgeway, Alaska
  13. 2.0 11 km NNE of Ridgeway, Alaska
  14. 1.5 21 km ESE of Funny River, Alaska
  15. 1.5 9 km SE of Kasilof, 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

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