QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5ml

92 km SSE of Sand Point, Alaska

Yes. A magnitude 3.5 earthquake was recorded 92 km SSE of Sand Point, Alaska, at 6:32 pm AKDT on 18 August 2026 (02:32 UTC), 35 km deep.

· 35 km deep · released about 2.7 tons of TNT

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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 3.5 (ml)
Depth
35 km below the surface
Felt
no reports yet
Measured shaking
intensity II (ShakeMap)
Nearest
Aleutians East Borough, 141 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 69 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 53 km (33 mi) from the epicentre. 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 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 63,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,000× the energy of this one
  4. This earthquake M 3.5 about 2.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.6× 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 7.3 on 2025-07-16 — about 500,000 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.6 85 km SE of Sand Point, Alaska · 46 km NE of this epicentre
  2. 6.1 79 km SE of Sand Point, Alaska · 37 km NE of this epicentre
  3. 6.0 71 km SSE of Sand Point, Alaska · 30 km NNE of this epicentre
  4. 5.9 99 km SE of Sand Point, Alaska · 45 km ENE of this epicentre
  5. 5.9 131 km S of Sand Point, Alaska · 42 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 54.5222, -160.1931. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aleutians East Borough, AK 141 km (87 mi) NW earthquakes near Aleutians East Borough

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

Aftershocks so far

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

  1. 2.7 95 km S of Sand Point, Alaska
  2. 2.7 97 km S of Sand Point, Alaska
  3. 2.6 105 km SSE of Sand Point, Alaska
  4. 2.7 91 km SSE of Sand Point, Alaska
  5. 2.5 105 km SSE of Sand Point, Alaska
  6. 3.0 101 km S of Sand Point, Alaska
  7. 3.0 108 km SSE of Sand Point, Alaska
  8. 2.6 97 km SSE of Sand Point, Alaska
  9. 3.1 88 km S of Sand Point, Alaska
  10. 2.9 87 km S of Sand Point, Alaska
  11. 2.9 92 km S of Sand Point, Alaska
  12. 5.0 81 km S of Sand Point, Alaska
  13. 2.7 104 km S of Sand Point, Alaska
  14. 2.6 98 km S of Sand Point, Alaska
  15. 2.7 91 km S of Sand Point, 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.