248 km WSW of Adak, Alaska

Yes. A magnitude 2.5 earthquake was recorded 248 km WSW of Adak, Alaska at 08:45 UTC on 2017-07-25, 22 km deep.

2017-07-25 08:45 UTC · 22 km deep · released about 170 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: 2017-07-25 08:45 UTC
Magnitude: M 2.5 (ml)
Depth: 22 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1193 days ago · we first saw it 1193 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 2 km (1 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 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.

Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
Magna, Utah 2020 M 5.7 63,000× the energy of this one
Around the size people start to feel M 3.0 5.6× the energy of this one
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.

For this area

The largest earthquake within 50 km since 2016 was M 5.1 on 2017-01-18 — about 7,900 times the energy of this one.

Before 2016, the USGS record lists 85 earthquakes of M5 or more within 50 km; the five largest:

7.2 238 km WSW of Adak, Alaska · 17 km NNE of this epicentre Mar 22, 1905
7.2 207 km WSW of Adak, Alaska · 49 km NE of this epicentre Dec 19, 2007
6.9 231 km WSW of Adak, Alaska · 34 km N of this epicentre May 14, 1969
6.8 235 km WSW of Adak, Alaska · 30 km N of this epicentre May 6, 1987
6.7 237 km WSW of Adak, Alaska · 39 km N of this epicentre Oct 13, 1926

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

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

2.1 243 km WSW of Adak, Alaska 10:57 UTC
1.9 238 km WSW of Adak, Alaska 15:21 UTC
2.8 225 km WSW of Adak, Alaska 09:06 UTC
4.1 232 km WSW of Adak, Alaska 16:18 UTC
3.8 234 km WSW of Adak, Alaska 18:52 UTC
3.7 234 km WSW of Adak, Alaska 17:48 UTC
2.7 239 km WSW of Adak, Alaska 17:39 UTC
2.6 238 km WSW of Adak, Alaska 17:27 UTC
2.6 248 km WSW of Adak, Alaska 17:21 UTC
4.0 253 km WSW of Adak, Alaska 17:15 UTC
3.0 244 km WSW of Adak, Alaska 16:26 UTC
3.0 209 km WSW of Adak, Alaska 00:26 UTC
2.2 210 km WSW of Adak, Alaska 07:53 UTC
2.4 242 km WSW of Adak, Alaska 05:22 UTC
2.5 240 km WSW of Adak, Alaska 02:16 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:53 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.