QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

4 km NW of Happy Valley, Alaska

· 73 km deep · released about 11 lb of TNT

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10 km30 km60 km120 km N Kenai Peninsula Borough 52 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 1.7 (ml)
Depth
73 km below the surface
Felt
no reports yet
Nearest
Kenai Peninsula Borough, 52 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 658 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 59.9742, -151.7972. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kenai Peninsula Borough, AK 52 km (33 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

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

  1. 1.5 12 km NNE of Ninilchik, Alaska
  2. 1.7 22 km W of Anchor Point, Alaska
  3. 1.7 21 km NW of Ninilchik, Alaska
  4. 1.5 36 km WNW of Ninilchik, Alaska
  5. 2.3 6 km NNW of Fritz Creek, Alaska
  6. 1.7 34 km WNW of Ninilchik, Alaska
  7. 1.7 20 km NW of Ninilchik, Alaska
  8. 1.9 27 km W of Anchor Point, Alaska
  9. 2.3 1 km WSW of Homer, Alaska
  10. 1.9 16 km E of Happy Valley, Alaska
  11. 1.5 28 km WSW of Anchor Point, Alaska
  12. 1.6 8 km NW of Anchor Point, Alaska
  13. 1.5 7 km ENE of Nikolaevsk, Alaska
  14. 1.8 37 km WNW of Ninilchik, Alaska
  15. 2.3 22 km W of Happy Valley, 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 5.4 on 2023-03-19 — it released about 350,000 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.