QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

12 km SE of Portage Creek, Alaska

· 11 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bristol Bay Borough 36 kmDillingham Census Area 89 kmLake and Peninsula Borough 105 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 2.5 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Bristol Bay Borough, 36 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 737 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 58.8196, -157.5932. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bristol Bay Borough, AK 36 km (22 mi) WNW of here earthquakes near Bristol Bay Borough
Dillingham Census Area, AK 89 km (55 mi) SSE of here earthquakes near Dillingham Census Area
Lake and Peninsula Borough, AK 105 km (65 mi) NW of here earthquakes near Lake and Peninsula Borough

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

Aftershocks so far

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

  1. 1.9 27 km SSE of Portage Creek, Alaska
  2. 2.0 7 km SE of Portage Creek, Alaska
  3. 1.6 20 km W of Naknek, Alaska
  4. 1.9 20 km SW of Ekwok, Alaska
  5. 1.5 12 km E of Portage Creek, Alaska
  6. 1.8 22 km SW of Levelock, Alaska
  7. 1.9 3 km W 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.