QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mb

262 km SSE of King Cove, Alaska

· 10 km deep · released about 21 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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 4.1 (mb)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2430 days ago

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

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× 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 52.9122, -160.6613. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 4.0 254 km SSE of King Cove, Alaska
  2. 3.2 215 km SSE of King Cove, Alaska
  3. 3.2 229 km S of Sand Point, Alaska
  4. 2.2 232 km S of Sand Point, Alaska
  5. 3.0 215 km SSE of King Cove, Alaska
  6. 4.2 228 km SSE of King Cove, Alaska
  7. 2.8 232 km S of Sand Point, Alaska
  8. 3.0 244 km SSE of King Cove, Alaska
  9. 2.9 232 km S of Sand Point, Alaska
  10. 3.2 238 km S of Sand Point, Alaska
  11. 2.6 244 km SSE of King Cove, Alaska
  12. 2.7 227 km S of Sand Point, Alaska
  13. 2.5 236 km S of Sand Point, Alaska
  14. 3.8 237 km S of Sand Point, Alaska
  15. 3.1 234 km S 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 4.2 on 2017-03-15 — it released about 1.4 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.