QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

8 km NW of Glacier View, Alaska

Yes. A magnitude 2.6 earthquake was recorded 8 km NW of Glacier View, Alaska, at 4:47 pm AKDT on 27 September 2020 (00:47 UTC), 38 km deep.

· 38 km deep · released about 240 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 101 kmAnchorage Municipality 111 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 2.6 (ml)
Depth
38 km below the surface
Felt
no reports yet
Nearest
Matanuska-Susitna Borough, 101 km WNW
Nearest mapped fault
Castle Mountain fault, 5 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2168 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 it was probably too small to be felt, even directly above it. 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 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 4.6 on 2018-01-27 — about 1,000 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 31 km SSW of Glacier View, Alaska · 37 km S of this epicentre
  2. 6.4 23 km S of Glacier View, Alaska · 30 km S of this epicentre
  3. 6.4 37 km SSE of Glacier View, Alaska · 45 km SSE of this epicentre
  4. 5.9 15 km N of Glacier View, Alaska · 10 km NNE of this epicentre
  5. 5.9 42 km S of Glacier View, Alaska · 49 km S 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 61.8611, -147.7710. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Matanuska-Susitna Borough, AK 101 km (63 mi) WNW earthquakes near Matanuska-Susitna Borough
Anchorage Municipality, AK 111 km (69 mi) SW earthquakes near Anchorage Municipality

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. 1.8 48 km NNE of Chickaloon, Alaska
  2. 1.5 33 km NNW of Glacier View, Alaska
  3. 2.0 18 km ESE of Glacier View, Alaska
  4. 1.7 Central Alaska
  5. 1.8 42 km S of Glacier View, Alaska
  6. 2.1 40 km NNW of Glacier View, Alaska
  7. 1.7 11 km W of Eureka Roadhouse, Alaska
  8. 1.8 27 km NNW of Glacier View, Alaska
  9. 2.2 30 km NE of Chickaloon, Alaska
  10. 1.9 31 km SSW of Glacier View, Alaska
  11. 1.8 28 km NW of Eureka Roadhouse, Alaska
  12. 1.7 30 km NNE of Chickaloon, Alaska
  13. 1.6 9 km WSW of Eureka Roadhouse, Alaska
  14. 1.8 25 km NNW of Eureka Roadhouse, Alaska
  15. 2.6 23 km S of Glacier View, 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.