QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3mb

102 km S of Sand Point, Alaska

Yes. A magnitude 4.3 earthquake was recorded 102 km S of Sand Point, Alaska, at 9:42 pm AKDT on 26 October 2019 (05:42 UTC), 30 km deep.

· 30 km deep · released about 43 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 4.3 (mb)
Depth
30 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 124 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2498 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 117 km (73 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 43 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 4,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 180× the energy of this one
  3. Magna, Utah 2020 M 5.7 130× the energy of this one
  4. This earthquake M 4.3 about 43 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 89× 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 since 2016 was M 5.8 on 2018-07-19 — about 180 times the energy of this one.

Before 2016, the USGS record lists 19 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 90 km SE of King Cove, Alaska · 36 km WNW of this epicentre
  2. 6.4 101 km SSW of Sand Point, Alaska · 27 km WNW of this epicentre
  3. 6.4 85 km ESE of King Cove, Alaska · 42 km NW of this epicentre
  4. 5.9 131 km S of Sand Point, Alaska · 34 km SSE of this epicentre
  5. 5.9 63 km S of Sand Point, Alaska · 39 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 54.4186, -160.6867. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aleutians East Borough, AK 124 km (77 mi) NW earthquakes near Aleutians East Borough

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

Aftershocks so far

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

  1. 2.6 91 km SE of King Cove, Alaska
  2. 2.7 102 km S of Sand Point, Alaska
  3. 1.6 55 km S of Sand Point, Alaska
  4. 1.8 122 km SE of King Cove, Alaska
  5. 2.8 58 km S of Sand Point, Alaska
  6. 1.7 67 km S of Sand Point, Alaska
  7. 1.6 60 km S of Sand Point, Alaska
  8. 2.6 82 km SSW of Sand Point, Alaska
  9. 1.8 80 km S of Sand Point, Alaska
  10. 1.8 117 km SE of King Cove, Alaska
  11. 2.5 116 km S of Sand Point, Alaska
  12. 2.0 107 km SSW of Sand Point, Alaska
  13. 2.1 84 km S of Sand Point, Alaska
  14. 2.8 104 km SSW of Sand Point, Alaska
  15. 2.3 92 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.

On USGS

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