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 10:10 am AKST (19:10 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 45 km (28 mi) south of Kalifornsky, AK, at 3:45 pm AKDT on 7 August 2025 (23:45 UTC), 47 km deep. 176 people have reported feeling it to USGS.

USGS: 13 km ESE of Ninilchik, Alaska

3:45 pm AKDT, Aug 7, 2025 · · 47 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 62 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
3:45 pm AKDT on 7 August 2025 ()
Where
45 km (28 mi) south of Kalifornsky, AK · earthquakes near Kalifornsky
Magnitude
M 4.0 (ml)
Depth
47 km below the surface
Felt
176 reports · strongest reported intensity III
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, 62 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 384 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 85 km (53 mi) from the epicentre. In Kalifornsky, 45 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: Fritz Creek 33 km, intensity II · Anchor Point 35 km, intensity II · Diamond Ridge 39 km, intensity II · Homer 43 km, intensity II · Kalifornsky 45 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 5.3 on 2017-05-07 — about 89 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 16 km WNW of Happy Valley, Alaska · 32 km W of this epicentre
  2. 6.0 31 km S of Funny River, Alaska · 48 km ENE of this epicentre
  3. 6.0 6 km SSE of Fox River, Alaska · 37 km SE of this epicentre
  4. 5.9 13 km N of Fox River, Alaska · 26 km ESE of this epicentre
  5. 5.8 23 km WNW of Happy Valley, Alaska · 38 km W 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 60.0238, -151.4344. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 62 km (39 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

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

  1. 1.5 10 km NE of Nikolaevsk, Alaska
  2. 1.8 19 km ESE of Kasilof, Alaska
  3. 1.7 12 km SE of Ninilchik, Alaska
  4. 1.9 16 km N of Ninilchik, Alaska
  5. 2.1 24 km ESE of Clam Gulch, Alaska
  6. 1.6 16 km N of Fritz Creek, Alaska
  7. 2.5 2 km NNW of Happy Valley, Alaska
  8. 2.3 16 km WNW of Cohoe, Alaska
  9. 2.2 8 km ENE of Ninilchik, Alaska
  10. 2.0 5 km ENE of Kalifornsky, Alaska
  11. 2.6 7 km WSW of Kasilof, Alaska
  12. 1.6 25 km WNW of Clam Gulch, Alaska
  13. 1.6 16 km NW of Ninilchik, Alaska
  14. 1.8 14 km ESE of Clam Gulch, Alaska
  15. 1.8 19 km WNW of Cohoe, 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.