QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

209 km S of Sand Point, Alaska

· 26 km deep · released about 120 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 2.4 (ml)
Depth
26 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2393 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 53.4571, -160.5743. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.6 200 km S of Sand Point, Alaska
  2. 2.3 229 km S of Sand Point, Alaska
  3. 2.6 233 km S of Sand Point, Alaska
  4. 2.6 248 km SSE of King Cove, Alaska
  5. 5.3 203 km S of Sand Point, Alaska
  6. 2.2 200 km S of Sand Point, Alaska
  7. 3.2 256 km S of Sand Point, Alaska
  8. 2.1 187 km S of Sand Point, Alaska
  9. 2.5 254 km SSE of King Cove, Alaska
  10. 3.1 231 km S of Sand Point, Alaska
  11. 3.9 221 km S of Sand Point, Alaska
  12. 2.6 223 km S of Sand Point, Alaska
  13. 2.7 185 km S of Sand Point, Alaska
  14. 2.8 208 km S of Sand Point, Alaska
  15. 2.5 219 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.7 on 2017-05-28 — it released about 89,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.