QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

215 km SE of Old Harbor, Alaska

· 5.9 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
5.9 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1143 days ago

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

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.

Where

Epicentre 55.6664, -151.1812. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.8 206 km SSE of Chiniak, Alaska
  2. 2.9 195 km SE of Old Harbor, Alaska
  3. 2.3 217 km SSE of Old Harbor, Alaska
  4. 2.2 225 km SSE of Old Harbor, Alaska
  5. 2.4 173 km SE of Old Harbor, Alaska
  6. 2.9 230 km SSE of Old Harbor, Alaska
  7. 2.5 south of Alaska
  8. 2.5 201 km SSE of Chiniak, Alaska
  9. 2.9 209 km SSE of Old Harbor, Alaska
  10. 2.7 183 km SSE of Old Harbor, Alaska
  11. 2.7 202 km SE of Old Harbor, Alaska
  12. 2.1 179 km SE of Old Harbor, Alaska
  13. 3.0 242 km SE of Old Harbor, Alaska
  14. 3.5 222 km SSE of Old Harbor, Alaska
  15. 2.1 189 km SE of Old Harbor, 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.