QuakeIndex

Earthquake · automatic estimate, may change

M 2.7ml

40 km NE of Whittier, Alaska

Yes. A magnitude 2.7 earthquake was recorded 40 km NE of Whittier, Alaska, at 10:46 am AKDT on 25 May 2021 (18:46 UTC), 7.8 km deep. The magnitude and location are an automatic first estimate and may change.

· 7.8 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 68 kmChugach Census Area 116 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 2.7 (ml)
Depth
7.8 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 68 km WNW
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 1931 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 24 km (15 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 lists 16 earthquakes of M5 or more within 50 km; the five largest:

  1. 9.2 The 1964 Prince William Sound, Alaska Earthquake · 41 km ESE of this epicentre
  2. 6.6 57 km ENE of Whittier, Alaska · 18 km ENE of this epicentre
  3. 6.6 37 km WNW of Tatitlek, Alaska · 43 km E of this epicentre
  4. 6.4 22 km ENE of Whittier, Alaska · 19 km SW of this epicentre
  5. 6.4 46 km WNW of Tatitlek, Alaska · 31 km E 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 60.9843, -148.0825. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 68 km (42 mi) WNW earthquakes near Anchorage Municipality
Chugach Census Area, AK 116 km (72 mi) ESE earthquakes near Chugach Census Area

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

Aftershocks so far

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

  1. 1.6 52 km ESE of Knik River, Alaska
  2. 1.6 Southern Alaska
  3. 1.7 47 km ESE of Whittier, Alaska
  4. 1.8 54 km WSW of Tatitlek, Alaska
  5. 2.0 56 km WSW of Tatitlek, Alaska
  6. 1.5 26 km SSE of Whittier, Alaska
  7. 1.6 54 km WSW of Tatitlek, Alaska
  8. 2.0 50 km W of Tatitlek, Alaska
  9. 1.8 49 km W of Tatitlek, Alaska
  10. 1.6 41 km NNE of Whittier, Alaska
  11. 1.5 Southern Alaska
  12. 1.7 59 km NE of Whittier, Alaska
  13. 1.6 47 km W of Tatitlek, Alaska
  14. 1.6 35 km NNE of Whittier, Alaska
  15. 2.2 24 km SSE of Whittier, 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.