QuakeIndex

Earthquake · automatic estimate, may change

M 0.4ml

60 km E of Pedro Bay, Alaska

· 33 km deep · released about 0.12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kenai Peninsula Borough 67 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
33 km below the surface
Felt
no reports yet
Nearest
Kenai Peninsula Borough, 67 km NE
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 26 hours ago

A magnitude 0.4 earthquake was recorded 60 km E of Pedro Bay, Alaska at 23:18 UTC on 2026-10-01. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

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 7.1 on 2016-01-24 — about 11,000,000,000 times the energy of this one.

Before 2016, the USGS record lists 25 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 75 km WNW of Ninilchik, Alaska · 44 km N of this epicentre
  2. 6.4 52 km ENE of Pedro Bay, Alaska · 8 km W of this epicentre
  3. 6.2 70 km E of Port Alsworth, Alaska · 29 km N of this epicentre
  4. 6.0 53 km W of Anchor Point, Alaska · 18 km ESE of this epicentre
  5. 5.9 66 km ENE of Pedro Bay, Alaska · 15 km N 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 59.8880, -153.0540. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 67 km (42 mi) NE earthquakes near Kenai Peninsula Borough

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

Aftershocks so far

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

  1. 0.3 63 km ENE of Pedro Bay, Alaska
  2. -1.0 65 km ENE of Pedro Bay, Alaska
  3. -1.1 64 km ENE of Pedro Bay, Alaska
  4. -1.2 64 km ENE of Pedro Bay, Alaska
  5. -0.8 64 km ENE of Pedro Bay, Alaska
  6. -0.4 63 km ENE of Pedro Bay, Alaska
  7. -1.2 64 km ENE of Pedro Bay, Alaska
  8. 1.7 62 km WNW of Ninilchik, Alaska
  9. 1.9 54 km WNW of Nanwalek, Alaska
  10. -0.7 63 km ENE of Pedro Bay, Alaska
  11. -0.9 64 km ENE of Pedro Bay, Alaska
  12. 1.9 65 km ENE of Pedro Bay, Alaska
  13. 0.8 46 km E of Port Alsworth, Alaska
  14. 1.0 62 km ENE of Pedro Bay, 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.