QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3mw

49 km SSE of Nelchina, Alaska

· 24 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 (mw)
Depth
24 km below the surface
Felt
11 reports · strongest reported intensity IV
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1152 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 11 people have reported feeling it to USGS.

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.

Where

Epicentre 61.6002, -146.3357. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.8 35 km NW of Valdez, Alaska
  2. 1.6 28 km NW of Valdez, Alaska
  3. 1.6 31 km N of Valdez, Alaska
  4. 1.6 46 km N of Valdez, Alaska
  5. 1.7 28 km N of Valdez, Alaska
  6. 1.5 45 km SSE of Nelchina, Alaska
  7. 2.2 47 km N of Valdez, Alaska
  8. 1.5 31 km WNW of Valdez, Alaska
  9. 1.6 34 km NW of Valdez, Alaska
  10. 1.5 49 km SSE of Nelchina, Alaska
  11. 1.5 45 km N of Valdez, Alaska
  12. 1.6 28 km SSE of Nelchina, Alaska
  13. 2.0 34 km NW of Valdez, Alaska
  14. 1.6 42 km SSE of Nelchina, Alaska
  15. 1.6 49 km SSE of Nelchina, 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

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