QuakeIndex

Earthquake · reviewed by a seismologist

M 5.0mww

129 km E of Atka, Alaska

Yes. A magnitude 5.0 earthquake was recorded 129 km E of Atka, Alaska at 06:47 UTC on 2023-11-03, 30 km deep. 1 person has reported feeling it to USGS.

· 30 km deep · released about 480 tons 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 5.0 (mww)
Depth
30 km below the surface
Felt
1 report · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 391 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

At this magnitude and depth, people at rest would likely notice it out to about 191 km (119 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 480 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16× the energy of this one
  3. Magna, Utah 2020 M 5.7 11× the energy of this one
  4. This earthquake M 5.0 about 480 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 1,000× more

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 (31 mi) since our catalogue begins in 2016. The previous largest was M 4.6 on 2021-06-30.

Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.3 Fox Islands, Aleutian Islands, Alaska · 35 km E of this epicentre
  2. 6.9 170 km E of Atka, Alaska · 47 km ENE of this epicentre
  3. 6.5 143 km ESE of Atka, Alaska · 28 km SSE of this epicentre
  4. 6.3 143 km E of Atka, Alaska · 14 km E of this epicentre
  5. 6.1 157 km ESE of Atka, Alaska · 30 km ESE 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 52.0015, -172.3426. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.7 121 km ESE of Atka, Alaska
  2. 2.7 120 km E of Atka, Alaska
  3. 3.1 128 km E of Atka, Alaska
  4. 3.3 139 km E of Atka, Alaska
  5. 2.1 105 km ESE of Atka, Alaska
  6. 2.2 127 km ENE of Atka, Alaska
  7. 2.7 92 km E of Atka, Alaska
  8. 2.9 121 km E of Atka, Alaska
  9. 2.9 109 km E of Atka, Alaska
  10. 2.8 121 km E of Atka, Alaska
  11. 2.9 145 km ESE of Atka, Alaska
  12. 3.2 150 km ESE of Atka, Alaska
  13. 2.9 97 km E of Atka, Alaska
  14. 2.1 111 km ESE of Atka, Alaska
  15. 2.0 107 km ESE of Atka, 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.