QuakeIndex

Earthquake · reviewed by a seismologist

M 5.7mww

178 km SSE of King Cove, Alaska

· 16 km deep · released about 5.4 kilotons 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 5.7 (mww)
Depth
16 km below the surface
Felt
no reports yet
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
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 1146 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

How big was it?

This earthquake released about 5.4 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.7 would have released about 32 times as much.

  1. Loma Prieta, California 1989 M 6.9 63× the energy of this one
  2. Northridge, California 1994 M 6.7 32× the energy of this one
  3. Mineral, Virginia 2011 M 5.8 1.4× the energy of this one
  4. This earthquake M 5.7 about 5.4 kilotons of TNT
  5. Around the size people start to feel M 3.0 this one released 11,000× 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 53.6537, -160.9873. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.2 165 km SE of King Cove, Alaska
  2. 2.6 177 km SSE of King Cove, Alaska
  3. 2.1 217 km SSE of King Cove, Alaska
  4. 2.1 142 km S of Sand Point, Alaska
  5. 2.2 176 km SSE of King Cove, Alaska
  6. 2.0 148 km S of Sand Point, Alaska
  7. 2.4 145 km S of Sand Point, Alaska
  8. 1.9 152 km S of Sand Point, Alaska
  9. 2.9 207 km S of Sand Point, Alaska
  10. 4.1 209 km S of Sand Point, Alaska
  11. 3.5 165 km SSE of King Cove, Alaska
  12. 4.6 163 km SSE of King Cove, Alaska
  13. 3.7 167 km SSE of King Cove, Alaska
  14. 3.1 214 km SSE of King Cove, Alaska
  15. 2.2 149 km SSE of King Cove, 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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