QuakeIndex

Earthquake · automatic estimate, may change

M 2.7ml

127 km ESE of Cordova, Alaska

Yes. A magnitude 2.7 earthquake was recorded 127 km ESE of Cordova, Alaska at 01:42 UTC on 2025-09-09, 11 km deep. The magnitude and location are an automatic first estimate and may change.

· 11 km deep · released about 340 lb 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 2.7 (ml)
Depth
11 km below the surface
Felt
no reports yet
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 431 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 22 km (14 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 lb of TNT

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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 60.0346, -143.6929. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.5 124 km E of Cordova, Alaska
  2. 1.7 112 km E of Cordova, Alaska
  3. 1.6 122 km S of McCarthy, Alaska
  4. 1.5 128 km S of McCarthy, Alaska
  5. 2.3 137 km S of McCarthy, Alaska
  6. 3.5 141 km ESE of Cordova, Alaska
  7. 1.8 126 km S of McCarthy, Alaska
  8. 1.5 133 km S of McCarthy, Alaska
  9. 1.5 122 km SSW of McCarthy, Alaska
  10. 1.8 137 km S of McCarthy, Alaska
  11. 1.7 124 km SSW of McCarthy, Alaska
  12. 3.0 138 km ESE of Cordova, Alaska
  13. 1.5 130 km S of McCarthy, Alaska
  14. 1.8 133 km S of McCarthy, Alaska
  15. 1.7 118 km SSW of McCarthy, 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.