QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

Southern Alaska

· 17 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 19 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
17 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Anchorage Municipality, 19 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1114 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

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.

Where

Epicentre 61.1087, -148.9533. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 19 km (12 mi) ESE of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 2.4 14 km S of Knik River, Alaska
  2. 1.5 16 km NE of Girdwood, Alaska
  3. 1.7 10 km SSW of Butte, Alaska
  4. 1.5 21 km ESE of Eagle River, Alaska
  5. 2.4 13 km WSW of Whittier, Alaska
  6. 1.5 6 km E of Knik River, Alaska
  7. 1.6 20 km NNW of Girdwood, Alaska
  8. 1.6 18 km WSW of Knik River, Alaska
  9. 1.8 15 km SSE of Girdwood, Alaska
  10. 1.5 16 km ENE of Eagle River, Alaska
  11. 1.9 36 km NNE of Whittier, Alaska
  12. 2.0 13 km NE of Hope, Alaska
  13. 1.6 9 km NE of Knik River, Alaska
  14. 1.9 4 km WNW of Sunrise, Alaska
  15. 1.7 9 km SSW of Gateway, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.2 on 2020-06-18 — it released about 180 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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