QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Cordova, AK

No earthquake was likely felt in Cordova in the 24 hours to 2:23 pm AKST (23:23 UTC). The last one was M 3.1, 39 km (24 mi) SSW, at 7:37 pm AKDT on 28 June 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Cordova

This page: a magnitude 1.7 earthquake was recorded 45 km (28 mi) west of Cordova, AK, at 11:59 pm AKST on 27 February 2025 (08:59 UTC), 8.3 km deep.

USGS: 42 km S of Tatitlek, Alaska

11:59 pm AKST, Feb 27, 2025 · · 8.3 km deep · released about 11 lb of TNT

Every earthquake near Cordova Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Chugach Census Area 20 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
11:59 pm AKST on 27 February 2025 ()
Where
45 km (28 mi) west of Cordova, AK · earthquakes near Cordova
Magnitude
M 1.7 (ml)
Depth
8.3 km below the surface
Felt
no reports yet
Nearest
Chugach Census Area, 20 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 592 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 9 km (6 mi) from the epicentre. In Cordova, 45 km away, the estimate is intensity I (not felt). 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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

The largest earthquake within 50 km since 2016 was M 4.4 on 2022-07-09 — about 11,000 times the energy of this one.

Before 2016, the USGS record lists 24 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.0 52 km NE of Chenega, Alaska · 41 km WSW of this epicentre
  2. 6.7 Prince William Sound, Alaska · 34 km NW of this epicentre
  3. 6.4 Prince William Sound, Alaska · 38 km W of this epicentre
  4. 6.3 60 km SW of Cordova, Alaska · 29 km S of this epicentre
  5. 6.3 56 km WSW of Cordova, Alaska · 17 km SSW of this epicentre

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 60.4852, -146.5759. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Chugach Census Area, AK 20 km (13 mi) E earthquakes near Chugach Census Area

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.8 30 km SE of Tatitlek, Alaska
  2. 1.7 28 km SW of Tatitlek, Alaska
  3. 2.0 59 km SSW of Tatitlek, Alaska
  4. 1.9 17 km SSW of Tatitlek, Alaska
  5. 1.8 29 km SSE of Tatitlek, Alaska
  6. 2.4 29 km SW of Tatitlek, Alaska
  7. 2.1 10 km W of Tatitlek, Alaska
  8. 1.6 12 km E of Tatitlek, Alaska
  9. 2.2 10 km ENE of Tatitlek, Alaska
  10. 1.8 17 km WSW of Tatitlek, Alaska
  11. 2.0 29 km SSE of Tatitlek, Alaska
  12. 1.9 12 km SSE of Tatitlek, Alaska
  13. 1.9 20 km S of Tatitlek, Alaska
  14. 2.1 19 km ESE of Tatitlek, Alaska
  15. 1.5 18 km S of Tatitlek, 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.