QuakeIndex

Earthquake · automatic estimate, may change

M 0.4ml

87 km NW of Karluk, Alaska

· 5.0 km deep · released about 0.12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake and Peninsula Borough 60 kmKodiak Island Borough 102 kmBristol Bay Borough 112 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
Magnitude
M 0.4 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Lake and Peninsula Borough, 60 km W
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 4 hours ago

A magnitude 0.4 earthquake was recorded 87 km NW of Karluk, Alaska at 22:09 UTC on 2026-10-07. 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. 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.

How big was it?

This earthquake released about 0.12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 1.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 7,900× the energy of this one
  4. This earthquake M 0.4 about 0.12 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 5.2 on 2019-01-22 — about 16,000,000 times the energy of this one.

Before 2016, the USGS record lists 49 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.0 Event 36 Novarupta-Mount Katmai area, Alaska Peninsula · 28 km ENE of this epicentre
  2. 6.8 Event 37 Novarupta-Mount Katmai area, Alaska Peninsula · 28 km ENE of this epicentre
  3. 6.8 Event 48 Novarupta-Mount Katmai area, Alaska Peninsula · 17 km NE of this epicentre
  4. 6.6 Event 39 Novarupta-Mount Katmai area, Alaska Peninsula · 28 km ENE of this epicentre
  5. 6.5 Event 21 Novarupta-Mount Katmai area, Alaska Peninsula · 28 km ENE 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 58.1700, -155.4040. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lake and Peninsula Borough, AK 60 km (37 mi) W earthquakes near Lake and Peninsula Borough
Kodiak Island Borough, AK 102 km (63 mi) ESE earthquakes near Kodiak Island Borough
Bristol Bay Borough, AK 112 km (69 mi) NW earthquakes near Bristol Bay Borough

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

Aftershocks so far

1 earthquake has been recorded within 50 km since this one.

  1. 1.1 86 km NW of Karluk, 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.