QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

147 km SE of Akutan, Alaska

Yes. A magnitude 3.0 earthquake was recorded 147 km SE of Akutan, Alaska, at 6:48 pm AKDT on 22 June 2020 (02:48 UTC), 10 km deep.

· 10 km deep · released about 950 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 3.0 (ml)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2267 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 35 km (22 mi) from the epicentre. 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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 2017-05-24 — about 1,400 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 136 km SE of Akutan, Alaska · 38 km NNE of this epicentre
  2. 6.2 156 km SE of Akutan, Alaska · 21 km ENE of this epicentre
  3. 6.1 136 km ESE of Akutan, Alaska · 50 km NNE of this epicentre
  4. 5.4 112 km SE of Akutan, Alaska · 37 km NNW of this epicentre
  5. 5.4 149 km SE of Akutan, Alaska · 4 km SSW 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 53.1307, -164.3202. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.9 151 km SSE of Akutan, Alaska
  2. 1.9 123 km SSE of Akutan, Alaska
  3. 3.7 152 km SE of Akutan, Alaska
  4. 1.7 137 km SSE of Akutan, Alaska
  5. 1.8 112 km SE of Akutan, Alaska
  6. 2.1 148 km SE of Akutan, Alaska
  7. 2.6 169 km SSE of Akutan, Alaska
  8. 1.8 148 km SSE of Akutan, Alaska
  9. 1.5 140 km SE of Akutan, Alaska
  10. 1.9 159 km SE of Akutan, Alaska
  11. 2.5 184 km SE of Akutan, Alaska
  12. 2.8 133 km SE of Akutan, Alaska
  13. 2.2 Unimak Island region, Alaska
  14. 1.9 121 km SE of Akutan, Alaska
  15. 1.9 141 km SE 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.