144 km E of Chignik, Alaska

Yes. A magnitude 2.2 earthquake was recorded 144 km E of Chignik, Alaska at 23:59 UTC on 2019-07-17, 3.7 km deep.

2019-07-17 23:59 UTC · 3.7 km deep · released about 60 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: 2019-07-17 23:59 UTC
Magnitude: M 2.2 (ml)
Depth: 3.7 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1896 days ago · we first saw it 1896 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 18 km (11 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
Magna, Utah 2020 M 5.7 180,000× the energy of this one
Around the size people start to feel M 3.0 16× the energy of this one
This earthquake M 2.2 about 60 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 4.5 on 2017-03-28 — about 2,800 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

6.9 143 km ESE of Chignik, Alaska · 40 km SSW of this epicentre Feb 13, 1951
6.9 171 km SW of Akhiok, Alaska · 49 km SSE of this epicentre Feb 6, 1964
6.3 112 km E of Chignik, Alaska · 33 km W of this epicentre Feb 25, 1953
6.1 132 km E of Chignik, Alaska · 13 km WNW of this epicentre Sep 13, 1911
6.1 118 km ESE of Chignik, Alaska · 40 km SW of this epicentre Mar 16, 1940

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

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

3.1 138 km WSW of Akhiok, Alaska 05:28 UTC
2.7 132 km SW of Akhiok, Alaska 16:27 UTC
2.4 127 km SSE of Ugashik, Alaska 12:51 UTC
3.4 119 km ESE of Chignik, Alaska 18:04 UTC
3.3 119 km E of Chignik, Alaska 20:19 UTC
3.0 153 km ESE of Chignik, Alaska 12:21 UTC
2.6 109 km E of Chignik, Alaska 17:33 UTC
2.9 126 km SW of Akhiok, AK 07:57 UTC
3.2 111 km E of Chignik, Alaska 22:50 UTC
2.1 121 km ENE of Chignik, Alaska 05:31 UTC
2.4 130 km SW of Akhiok, Alaska 05:35 UTC
2.1 113 km E of Chignik, Alaska 05:45 UTC
2.3 135 km E of Chignik, Alaska 16:07 UTC
2.0 115 km E of Chignik, Alaska 16:43 UTC
2.8 142 km E of Chignik, Alaska 03:06 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:37 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.