QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5ml

210 km SE of Perryville, Alaska

Yes. A magnitude 3.5 earthquake was recorded 210 km SE of Perryville, Alaska at 11:19 UTC on 2026-03-10, 20 km deep.

· 20 km deep · released about 2.7 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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 3.5 (ml)
Depth
20 km below the surface
Felt
no reports yet
Measured shaking
intensity I (ShakeMap)
Nearest mapped fault
Alaska-Aleutian subduction zone, 21 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 175 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 60 km (37 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 63,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,000× the energy of this one
  4. This earthquake M 3.5 about 2.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.6× 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.

For this area

The largest earthquake within 50 km since 2016 was M 5.0 on 2023-01-10 — about 180 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.9 182 km SE of Perryville, Alaska · 31 km N of this epicentre
  2. 5.8 249 km SSE of Perryville, Alaska · 48 km S of this epicentre
  3. 5.0 213 km SE of Perryville, Alaska · 45 km NE of this epicentre

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 54.3620, -157.2450. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.5 198 km SE of Perryville, Alaska
  2. 3.1 188 km SE of Perryville, Alaska
  3. 3.2 202 km SE of Perryville, Alaska
  4. 2.8 249 km SSE of Perryville, Alaska
  5. 3.3 253 km SSE of Perryville, Alaska
  6. 3.2 196 km SE of Perryville, Alaska
  7. 3.1 202 km SE of Perryville, Alaska
  8. 2.8 199 km SE of Perryville, Alaska
  9. 3.6 196 km SE of Perryville, 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.