QuakeIndex

Earthquake · reviewed by a seismologist

M 7.1mw

47 km ESE of Pedro Bay, Alaska

· 126 km deep · released about 670 kilotons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kenai Peninsula Borough 100 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 7.1 (mw)
Depth
126 km below the surface
Felt
1858 reports · strongest reported intensity VII
Measured shaking
intensity VII (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Kenai Peninsula Borough, 100 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 834 days ago

This was a major earthquake. Serious damage is likely near the epicentre. Follow official information from USGS and local authorities. 1858 people have reported feeling it to USGS.

How big was it?

This earthquake released about 670 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 8.1 would have released about 32 times as much.

  1. Great Alaska earthquake 1964 M 9.2 1,400× the energy of this one
  2. Tōhoku, Japan 2011 M 9.1 1,000× the energy of this one
  3. San Francisco 1906 M 7.9 16× the energy of this one
  4. This earthquake M 7.1 about 670 kilotons of TNT
  5. Loma Prieta, California 1989 M 6.9 this one released 2× more
  6. Northridge, California 1994 M 6.7 this one released 4× 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 59.6204, -153.3392. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kenai Peninsula Borough, AK 100 km (62 mi) SW 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

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

  1. 1.9 50 km E of Pedro Bay, Alaska
  2. 2.4 56 km E of Pedro Bay, Alaska
  3. 2.1 61 km W of Anchor Point, Alaska
  4. 2.0 63 km E of Pedro Bay, Alaska
  5. 2.0 Southern Alaska
  6. 2.3 49 km ESE of Pedro Bay, Alaska
  7. 2.5 54 km E of Pedro Bay, Alaska
  8. 2.0 57 km E of Pedro Bay, Alaska
  9. 3.0 62 km E of Pedro Bay, Alaska
  10. 2.2 60 km E of Pedro Bay, Alaska
  11. 2.1 58 km E of Pedro Bay, Alaska
  12. 2.0 47 km ESE of Pedro Bay, Alaska
  13. 1.8 59 km E of Pedro Bay, Alaska
  14. 1.9 56 km E of Pedro Bay, Alaska
  15. 3.2 59 km WSW 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.

On USGS

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