QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

30 km S of Rampart, Alaska

Yes. A magnitude 1.5 earthquake was recorded 30 km S of Rampart, Alaska at 22:49 UTC on 2026-09-07, 5.7 km deep.

· 5.7 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yukon-Koyukuk Census Area 68 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 1.5 (ml)
Depth
5.7 km below the surface
Felt
no reports yet
Nearest
Yukon-Koyukuk Census Area, 68 km WNW
Nearest mapped fault
Rampart seismic zone, under 1 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 64 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 8 km (5 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 4.7 on 2018-08-28 — about 63,000 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 6.5 15 km S of Rampart, Alaska · 16 km N of this epicentre
  2. 5.5 30 km S of Rampart, Alaska · 4 km W 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 65.2280, -150.1590. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Yukon-Koyukuk Census Area, AK 68 km (42 mi) WNW earthquakes near Yukon-Koyukuk Census Area

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

Aftershocks so far

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

  1. 1.5 31 km ENE of Manley Hot Springs, Alaska
  2. 1.8 30 km ENE of Manley Hot Springs, Alaska
  3. 1.4 29 km E of Manley Hot Springs, Alaska
  4. 2.3 16 km SE of Manley Hot Springs, Alaska
  5. 1.7 11 km SE of Rampart, Alaska
  6. 1.5 21 km NNE of Manley Hot Springs, Alaska
  7. 1.5 10 km ESE of Rampart, Alaska
  8. 1.3 30 km ENE of Manley Hot Springs, Alaska
  9. 1.7 18 km SE of Manley Hot Springs, Alaska
  10. 1.3 6 km NNE of Manley Hot Springs, Alaska
  11. 1.2 10 km ESE of Rampart, Alaska
  12. 1.5 30 km ENE of Manley Hot Springs, Alaska
  13. 2.1 15 km NNE of Rampart, Alaska
  14. 1.6 20 km SSE of Rampart, Alaska
  15. 1.7 23 km S of Rampart, 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.