QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Earthquake near Dillingham, AK

USGS: 21 km SW of Ekwok, Alaska

8:10 pm AKDT, Apr 18, 2018 · · 7.6 km deep · released about 5.4 lb of TNT

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10 km30 km60 km120 km N Dillingham Census Area 50 kmBristol Bay Borough 66 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
8:10 pm AKDT on 18 April 2018 ()
Where
46 km (29 mi) ENE of Dillingham, AK · earthquakes near Dillingham
Magnitude
M 1.5 (ml)
Depth
7.6 km below the surface
Felt
no reports yet
Nearest
Dillingham Census Area, 50 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1146 days ago

A magnitude 1.5 earthquake was recorded 46 km (29 mi) ENE of Dillingham, AK, at 8:10 pm AKDT on 18 April 2018 (04:10 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 59.1967, -157.7093. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Dillingham Census Area, AK 50 km (31 mi) NW earthquakes near Dillingham Census Area
Bristol Bay Borough, AK 66 km (41 mi) SE earthquakes near Bristol Bay Borough

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

Aftershocks so far

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

  1. 2.1 13 km SSE of Portage Creek, Alaska
  2. 2.0 7 km SE of Portage Creek, Alaska
  3. 1.9 20 km SW of Ekwok, Alaska
  4. 1.5 12 km E of Portage Creek, Alaska
  5. 1.8 22 km SW of Levelock, Alaska
  6. 1.9 3 km W of Portage Creek, Alaska
  7. 2.5 12 km SE of Portage Creek, Alaska
  8. 2.3 9 km N of New Stuyahok, Alaska
  9. 1.8 23 km NNW of Portage Creek, Alaska
  10. 1.6 8 km NNE of Portage Creek, Alaska
  11. 2.1 6 km W of Portage Creek, Alaska
  12. 1.7 15 km WSW of Ekwok, Alaska
  13. 1.5 10 km ESE of Portage Creek, Alaska
  14. 1.5 23 km N of Portage Creek, Alaska
  15. 1.9 8 km NE of Portage Creek, 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.