QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Earthquake near Dillingham, AK

USGS: 6 km S of Clarks Point, Alaska

10:10 am AKDT, Sep 23, 2018 · · 7.1 km deep · released about 5.4 lb of TNT

Every earthquake near Dillingham Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dillingham Census Area 87 kmBristol Bay Borough 90 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
10:10 am AKDT on 23 September 2018 ()
Where
29 km (18 mi) S of Dillingham, AK · earthquakes near Dillingham
Magnitude
M 1.5 (ml)
Depth
7.1 km below the surface
Felt
no reports yet
Nearest
Dillingham Census Area, 87 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1143 days ago

A magnitude 1.5 earthquake was recorded 29 km (18 mi) S of Dillingham, AK, at 10:10 am AKDT on 23 September 2018 (18:10 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 58.7785, -158.5453. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Dillingham Census Area, AK 87 km (54 mi) N earthquakes near Dillingham Census Area
Bristol Bay Borough, AK 90 km (56 mi) E earthquakes near Bristol Bay Borough

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

Aftershocks so far

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

  1. 2.1 9 km WSW of Clarks Point, Alaska
  2. 2.1 7 km WSW of Clarks Point, Alaska
  3. 2.1 11 km SSW of Clarks Point, Alaska
  4. 2.6 20 km SW of Clarks Point, Alaska
  5. 2.2 25 km SSW of Clarks Point, Alaska
  6. 2.7 22 km SSW of Clarks Point, Alaska
  7. 3.7 19 km S of Clarks Point, Alaska
  8. 2.0 27 km ESE of Clarks Point, Alaska
  9. 1.8 17 km SE of Clarks Point, Alaska
  10. 1.6 10 km SW of Clarks Point, Alaska
  11. 1.9 23 km S of Clarks Point, Alaska
  12. 2.1 10 km SW of Clarks Point, Alaska
  13. 2.0 43 km SSW of Portage Creek, Alaska
  14. 1.9 5 km NNW of Clarks Point, Alaska
  15. 2.0 4 km NW of Clarks Point, 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.