QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

209 km WSW of Adak, Alaska

· 58 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
58 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 852 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 51.5100, -179.6122. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.0 187 km WSW of Adak, Alaska
  2. 2.5 237 km WSW of Adak, Alaska
  3. 1.5 189 km WSW of Adak, Alaska
  4. 1.7 219 km WSW of Adak, Alaska
  5. 1.5 192 km W of Adak, Alaska
  6. 1.9 193 km W of Adak, Alaska
  7. 1.9 207 km WSW of Adak, Alaska
  8. 2.5 174 km WSW of Adak, Alaska
  9. 2.2 192 km W of Adak, Alaska
  10. 1.7 238 km WSW of Adak, Alaska
  11. 2.1 218 km WSW of Adak, Alaska
  12. 2.6 201 km WSW of Adak, Alaska
  13. 1.7 183 km WSW of Adak, Alaska
  14. 3.1 217 km WSW of Adak, Alaska
  15. 1.7 222 km WSW of Adak, 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 6.1 on 2020-01-26 — it released about 350,000 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.