QuakeIndex

Earthquake · automatic estimate, may change

M 1.8ml

103 km ESE of McCarthy, Alaska

Yes. A magnitude 1.8 earthquake was recorded 103 km ESE of McCarthy, Alaska at 02:23 UTC on 2025-09-19, less than 1 km deep. The magnitude and location are an automatic first estimate and may change.

· 0.0 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yakutat City and Borough 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 1.8 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Yakutat City and Borough, 116 km SSE
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 421 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 14 km (9 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 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.

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 3 earthquakes of M5 or more within 50 km:

  1. 7.1 113 km SE of McCarthy, Alaska · 42 km SSW of this epicentre
  2. 6.1 109 km E of McCarthy, Alaska · 36 km NNE of this epicentre
  3. 5.4 127 km SE of McCarthy, Alaska · 39 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 60.9794, -141.2314. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Yakutat City and Borough, AK 116 km (72 mi) SSE earthquakes near Yakutat City and Borough

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

Aftershocks so far

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

  1. 2.5 135 km NW of Yakutat, Alaska
  2. 1.7 135 km SE of McCarthy, Alaska
  3. 1.8 133 km SE of McCarthy, Alaska
  4. 2.4 136 km SE of McCarthy, Alaska
  5. 1.8 103 km E of McCarthy, Alaska
  6. 1.9 96 km E of McCarthy, Alaska
  7. 2.0 101 km E of McCarthy, Alaska
  8. 1.7 68 km ESE of McCarthy, Alaska
  9. 2.4 92 km E of McCarthy, Alaska
  10. 1.7 96 km E of McCarthy, Alaska
  11. 1.8 104 km ESE of McCarthy, Alaska
  12. 1.5 96 km E of McCarthy, Alaska
  13. 1.9 121 km E of McCarthy, Alaska
  14. 1.5 101 km E of McCarthy, Alaska
  15. 1.6 120 km E of McCarthy, 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.