Alaska Peninsula

Yes. A magnitude 2.3 earthquake was recorded in the Alaska Peninsula at 09:15 UTC on 2021-07-30, 41 km deep.

2021-07-30 09:15 UTC · 41 km deep · released about 85 lb of TNT

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: 2021-07-30 09:15 UTC
Magnitude: M 2.3 (ml)
Depth: 41 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1918 days ago · we first saw it 1918 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
Magna, Utah 2020 M 5.7 130,000× the energy of this one
Around the size people start to feel M 3.0 11× the energy of this one
This earthquake M 2.3 about 85 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

The largest earthquake within 50 km in our catalogue was M 5.9 on 2021-07-29 — about 250,000 times the energy of this one.

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

Map loads when it scrolls into view

Aftershocks so far

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

2.3 136 km SE of Perryville, Alaska 21:57 UTC
2.3 137 km SE of Perryville, Alaska 21:52 UTC
2.3 147 km SE of Perryville, Alaska 19:36 UTC
3.0 167 km SE of Perryville, Alaska 19:29 UTC
2.5 119 km SE of Perryville, Alaska 16:26 UTC
1.9 120 km SE of Perryville, Alaska 16:20 UTC
3.7 139 km SE of Perryville, Alaska 15:40 UTC
3.8 149 km SSE of Chignik, Alaska 15:28 UTC
2.3 143 km SE of Perryville, Alaska 15:19 UTC
3.1 137 km SE of Perryville, Alaska 12:58 UTC
2.6 134 km SE of Perryville, Alaska 11:03 UTC
2.8 Alaska Peninsula 08:34 UTC
2.5 116 km SE of Perryville, Alaska 08:29 UTC
2.5 141 km SE of Perryville, Alaska 07:34 UTC
2.7 128 km SE of Chignik, Alaska 07:14 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 06:39 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

The official USGS event page — the source of record for every value above
Did you feel it? Report it to USGS — reports go to USGS, not to us
ShakeMap for this event, when USGS has produced one

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.