QuakeIndex

Earthquake · reviewed by a seismologist

M 5.8mww

101 km S of Sand Point, Alaska

· 21 km deep · released about 7.6 kilotons of TNT

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10 km30 km60 km120 km N Aleutians East Borough 118 km
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 5.8 (mww)
Depth
21 km below the surface
Felt
12 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Aleutians East Borough, 118 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1139 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 12 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.8 would have released about 32 times as much.

  1. Ridgecrest, California 2019 M 7.1 89× the energy of this one
  2. Loma Prieta, California 1989 M 6.9 45× the energy of this one
  3. Northridge, California 1994 M 6.7 22× the energy of this one
  4. This earthquake M 5.8 about 7.6 kilotons of TNT
  5. Magna, Utah 2020 M 5.7 this one released 1.4× more
  6. Around the size people start to feel M 3.0 this one released 16,000× 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.

Where

Epicentre 54.4430, -160.7975. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 118 km (73 mi) SE of here earthquakes near Aleutians East Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.5 107 km SSW of Sand Point, Alaska
  2. 2.6 78 km SSW of Sand Point, Alaska
  3. 3.3 82 km ESE of King Cove, Alaska
  4. 2.3 95 km S of Sand Point, Alaska
  5. 2.8 74 km SW of Sand Point, Alaska
  6. 2.1 90 km SSW of Sand Point, Alaska
  7. 2.6 101 km SSW of Sand Point, Alaska
  8. 2.0 85 km SSW of Sand Point, Alaska
  9. 2.0 79 km SSW of Sand Point, Alaska
  10. 2.3 117 km SE of King Cove, Alaska
  11. 1.8 105 km SE of King Cove, Alaska
  12. 1.8 61 km S of Sand Point, Alaska
  13. 2.0 61 km S of Sand Point, Alaska
  14. 3.5 114 km S of Sand Point, Alaska
  15. 1.8 74 km SSW 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 5.6 on 2018-07-18.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.