QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8mwr

34 km WNW of Tatitlek, Alaska

· 18 km deep · released about 7.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Chugach Census Area 79 kmAnchorage Municipality 110 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 3.8 (mwr)
Depth
18 km below the surface
Felt
39 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Chugach Census Area, 79 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1604 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 39 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 710× the energy of this one
  4. This earthquake M 3.8 about 7.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× more

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 60.9654, -147.2882. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Chugach Census Area, AK 79 km (49 mi) NW of here earthquakes near Chugach Census Area
Anchorage Municipality, AK 110 km (68 mi) ESE of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 1.5 59 km S of Glacier View, Alaska
  2. 1.6 30 km WNW of Valdez, Alaska
  3. 1.5 62 km S of Glacier View, Alaska
  4. 1.9 51 km SSE of Glacier View, Alaska
  5. 2.5 36 km SW of Tatitlek, Alaska
  6. 1.6 10 km WSW of Tatitlek, Alaska
  7. 1.7 63 km S of Glacier View, Alaska
  8. 1.6 53 km WNW of Tatitlek, Alaska
  9. 1.7 53 km WNW of Valdez, Alaska
  10. 2.4 51 km NW of Valdez, Alaska
  11. 1.6 33 km W of Valdez, Alaska
  12. 2.5 63 km NW of Tatitlek, Alaska
  13. 1.9 35 km WNW of Valdez, Alaska
  14. 1.5 57 km WSW of Tatitlek, Alaska
  15. 1.6 32 km WNW of Tatitlek, 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 5.3 on 2017-11-27 — it released about 180 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.