QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

79 km WSW of Mosquito Lake, Alaska

· 9.5 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Haines Borough 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
9.5 km below the surface
Felt
no reports yet
Nearest
Haines Borough, 108 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1359 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 59.3163, -137.4307. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Haines Borough, AK 108 km (67 mi) WNW of here earthquakes near Haines Borough
Skagway Municipality, AK 121 km (75 mi) WSW of here earthquakes near Skagway Municipality
Hoonah-Angoon Census Area, AK 135 km (84 mi) NW of here earthquakes near Hoonah-Angoon Census Area

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. 1.5 82 km SW of Covenant Life, Alaska
  2. 1.9 93 km WSW of Mosquito Lake, Alaska
  3. 1.6 110 km WSW of Covenant Life, Alaska
  4. 1.7 73 km WSW of Covenant Life, Alaska
  5. 2.4 112 km WSW of Covenant Life, Alaska
  6. 1.7 82 km WSW of Covenant Life, Alaska
  7. 1.7 108 km WSW of Covenant Life, Alaska
  8. 1.6 84 km W of Mosquito Lake, Alaska
  9. 1.8 73 km WSW of Covenant Life, Alaska
  10. 1.7 111 km WSW of Covenant Life, Alaska
  11. 2.2 118 km ESE of Yakutat, Alaska
  12. 1.9 116 km ESE of Yakutat, Alaska
  13. 2.1 117 km ESE of Yakutat, Alaska
  14. 2.2 59 km WSW of Covenant Life, Alaska
  15. 2.6 119 km WSW 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.