QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

57 km NW of Gustavus, Alaska

· 3.5 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hoonah-Angoon Census Area 52 kmHaines Borough 61 kmSkagway Municipality 108 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
3.5 km below the surface
Felt
no reports yet
Nearest
Hoonah-Angoon Census Area, 52 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2567 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 58.7732, -136.4424. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hoonah-Angoon Census Area, AK 52 km (32 mi) NW of here earthquakes near Hoonah-Angoon Census Area
Haines Borough, AK 61 km (38 mi) SW of here earthquakes near Haines Borough
Skagway Municipality, AK 108 km (67 mi) SW of here earthquakes near Skagway Municipality

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

Aftershocks so far

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

  1. 1.9 67 km NNW of Elfin Cove, Alaska
  2. 2.0 30 km SSW of Covenant Life, Alaska
  3. 2.0 66 km NW of Gustavus, Alaska
  4. 1.5 39 km SSW of Klukwan, Alaska
  5. 3.0 61 km SSW of Covenant Life, Alaska
  6. 1.7 29 km SSW of Covenant Life, Alaska
  7. 2.1 61 km SW of Covenant Life, Alaska
  8. 1.8 Southeastern Alaska
  9. 1.7 69 km SW of Covenant Life, Alaska
  10. 1.5 43 km S of Covenant Life, Alaska
  11. 1.6 40 km S of Covenant Life, Alaska
  12. 1.6 63 km SSW of Covenant Life, Alaska
  13. 3.0 76 km NNW of Elfin Cove, Alaska
  14. 1.6 71 km SW of Covenant Life, Alaska
  15. 1.7 65 km SW of Covenant Life, 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 5.0 on 2019-09-01 — it released about 63,000 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.