QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0ml

105 km ESE of Akutan, Alaska

Yes. A magnitude 2.0 earthquake was recorded 105 km ESE of Akutan, Alaska, at 4:15 am AKDT on 28 April 2021 (12:15 UTC), 67 km deep.

· 67 km deep · released about 30 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 2.0 (ml)
Depth
67 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1985 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause 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 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 350,000× the energy of this one
  3. Around the size people start to feel M 3.0 32× the energy of this one
  4. This earthquake M 2.0 about 30 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 5.1 on 2021-01-11 — about 45,000 times the energy of this one.

Before 2016, the USGS record lists 41 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.6 92 km SE of Akutan, Alaska · 45 km SW of this epicentre
  2. 6.5 59 km ESE of Akutan, Alaska · 49 km W of this epicentre
  3. 6.5 83 km SE of Akutan, Alaska · 43 km SW of this epicentre
  4. 6.5 81 km ESE of Akutan, Alaska · 36 km WSW of this epicentre
  5. 6.5 79 km SW of False Pass, Alaska · 37 km N of this epicentre

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 53.9583, -164.1985. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.0 88 km SE of Akutan, Alaska
  2. 2.0 92 km SSW of False Pass, Alaska
  3. 1.8 124 km SSW of False Pass, Alaska
  4. 1.8 80 km ESE of Akutan, Alaska
  5. 1.7 81 km ESE of Akutan, Alaska
  6. 1.9 118 km ESE of Akutan, Alaska
  7. 1.8 89 km SE of Akutan, Alaska
  8. 1.7 99 km S of False Pass, Alaska
  9. 1.9 132 km ESE of Akutan, Alaska
  10. 1.9 116 km SSW of False Pass, Alaska
  11. 1.9 91 km E of Akutan, Alaska
  12. 2.1 88 km SW of False Pass, Alaska
  13. 1.6 78 km SSW of False Pass, Alaska
  14. 1.5 79 km E of Akutan, Alaska
  15. 1.5 114 km ESE of Akutan, 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.