QuakeIndex

Earthquake · reviewed by a seismologist

M 5.6mw

48 km WNW of Nanwalek, Alaska

· 78 km deep · released about 3.8 kilotons of TNT

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10 km30 km60 km120 km N Kenai Peninsula Borough 90 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 5.6 (mw)
Depth
78 km below the surface
Felt
126 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Kenai Peninsula Borough, 90 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1149 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 126 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.8 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 45× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2× the energy of this one
  3. Magna, Utah 2020 M 5.7 1.4× the energy of this one
  4. This earthquake M 5.6 about 3.8 kilotons of TNT
  5. Around the size people start to feel M 3.0 this one released 7,900× 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 59.5785, -152.6546. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kenai Peninsula Borough, AK 90 km (56 mi) SSW 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

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

  1. 1.8 66 km ESE of Pedro Bay, Alaska
  2. 1.7 50 km W of Nanwalek, Alaska
  3. 1.6 26 km WNW of Anchor Point, Alaska
  4. 1.8 53 km WNW of Nanwalek, Alaska
  5. 1.6 15 km W of Anchor Point, Alaska
  6. 1.7 47 km W of Nanwalek, Alaska
  7. 1.5 27 km W of Anchor Point, Alaska
  8. 1.7 60 km E of Pedro Bay, Alaska
  9. 2.1 38 km WSW of Anchor Point, Alaska
  10. 1.5 29 km WNW of Anchor Point, Alaska
  11. 1.7 49 km WNW of Nanwalek, Alaska
  12. 2.2 61 km E of Pedro Bay, Alaska
  13. 1.8 51 km E of Pedro Bay, Alaska
  14. 4.0 63 km E of Pedro Bay, Alaska
  15. 1.7 53 km W of Anchor 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 4.7 on 2016-01-24.

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

On USGS

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