QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

29 km E of Halibut Cove, Alaska

· 38 km deep · released about 15 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 1.8 (ml)
Depth
38 km below the surface
Felt
no reports yet
Nearest
Kenai Peninsula Borough, 127 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2515 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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.

Where

Epicentre 59.5626, -150.7043. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kenai Peninsula Borough, AK 127 km (79 mi) SE of here earthquakes near Kenai Peninsula 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. 1.9 Kenai Peninsula, Alaska
  2. 1.5 14 km SE of Fox River, Alaska
  3. 1.9 35 km ESE of Fox River, Alaska
  4. 1.6 33 km S of Halibut Cove, Alaska
  5. 2.1 34 km SE of Seldovia Village, Alaska
  6. 1.7 23 km ESE of Fox River, Alaska
  7. 2.5 45 km SE of Halibut Cove, Alaska
  8. 1.6 21 km ESE of Fox River, Alaska
  9. 2.3 6 km NE of Halibut Cove, Alaska
  10. 1.6 25 km S of Halibut Cove, Alaska
  11. 1.8 7 km E of Halibut Cove, Alaska
  12. 2.0 41 km E of Fox River, Alaska
  13. 2.2 23 km E of Halibut Cove, Alaska
  14. 1.5 16 km E of Fox River, Alaska
  15. 1.6 9 km ESE of Fox River, 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 4.3 on 2018-07-13 — it released about 5,600 times the energy of this one.

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

On USGS

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