QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

187 km SSE of Sand Point, Alaska

· 30 km deep · released about 85 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 2.3 (ml)
Depth
30 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1339 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 53.6907, -159.8634. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.7 203 km S of Sand Point, Alaska
  2. 2.9 210 km S of Sand Point, Alaska
  3. 4.2 200 km S of Sand Point, Alaska
  4. 2.1 187 km S of Sand Point, Alaska
  5. 3.3 201 km S of Sand Point, Alaska
  6. 3.3 194 km S of Sand Point, Alaska
  7. 4.2 202 km S of Sand Point, Alaska
  8. 2.8 207 km SSE of Sand Point, Alaska
  9. 2.0 159 km SSE of Sand Point, Alaska
  10. 2.5 208 km S of Sand Point, Alaska
  11. 2.2 145 km SSE of Sand Point, Alaska
  12. 3.4 209 km S of Sand Point, Alaska
  13. 3.7 224 km S of Sand Point, Alaska
  14. 2.8 146 km SSE of Sand Point, Alaska
  15. 2.6 209 km SSE 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 5.4 on 2021-06-18 — it released about 45,000 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.