QuakeIndex

Earthquake · automatic estimate, may change

M 2.6ml

33 km ENE of Port Heiden, Alaska

Yes. A magnitude 2.6 earthquake was recorded 33 km ENE of Port Heiden, Alaska at 06:33 UTC on 2021-05-25, 141 km deep. The magnitude and location are an automatic first estimate and may change.

· 141 km deep · released about 240 lb 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 2.6 (ml)
Depth
141 km below the surface
Felt
no reports yet
Nearest
Lake and Peninsula Borough, 155 km NE
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 1931 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 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 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 6.2 on 2016-04-02 — about 250,000 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 57.0557, -158.1161. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lake and Peninsula Borough, AK 155 km (96 mi) NE earthquakes near Lake and Peninsula 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. 3.2 30 km ESE of Port Heiden, Alaska
  2. 2.6 39 km ESE of Port Heiden, Alaska
  3. 2.1 Alaska Peninsula
  4. 2.1 33 km E of Port Heiden, Alaska
  5. 1.8 31 km ESE of Port Heiden, Alaska
  6. 2.1 33 km E of Port Heiden, Alaska
  7. 1.9 31 km E of Port Heiden, Alaska
  8. 1.7 40 km ESE of Port Heiden, Alaska
  9. 1.9 33 km E of Port Heiden, Alaska
  10. 2.0 38 km E of Port Heiden, Alaska
  11. 1.9 38 km ESE of Port Heiden, Alaska
  12. 1.8 39 km E of Port Heiden, Alaska
  13. 2.0 Alaska Peninsula
  14. 1.9 Alaska Peninsula
  15. 1.7 29 km ESE of Port Heiden, 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.