QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km NNW of Eureka Roadhouse, Alaska

· 34 km deep · released about 15 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 1.8 (ml)
Depth
34 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 142 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 78 days ago

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

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 61.9790, -147.2040. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 142 km (88 mi) NE of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 1.5 13 km SSW of Nelchina, Alaska
  2. 1.7 9 km W of Eureka Roadhouse, Alaska
  3. 2.1 33 km SE of Glacier View, Alaska
  4. 1.9 31 km SSE of Eureka Roadhouse, Alaska
  5. 1.5 15 km N of Glacier View, Alaska
  6. 2.1 9 km SE of Eureka Roadhouse, Alaska
  7. 2.4 26 km NW of Eureka Roadhouse, Alaska
  8. 1.8 23 km SSE of Eureka Roadhouse, Alaska
  9. 1.8 18 km ESE of Glacier View, Alaska
  10. 1.8 20 km S of Eureka Roadhouse, Alaska
  11. 2.1 40 km W of Lake Louise, Alaska
  12. 1.8 42 km S of Nelchina, Alaska
  13. 2.3 24 km N of Glacier View, Alaska
  14. 1.7 27 km SE of Glacier View, Alaska
  15. 1.6 15 km WNW of Eureka Roadhouse, 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 4.8 on 2022-10-06 — it released about 32,000 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.