116 km SE of Chenega, Alaska

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 8 km (5 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
3. Around the size people start to feel M 3.0 45× the energy of this one
4. This earthquake M 1.9 about 21 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

1. 6.1 101 km SE of Chenega, Alaska · 21 km N of this epicentre Mar 28, 1964
2. 5.9 94 km SSE of Chenega, Alaska · 38 km W of this epicentre Sep 28, 1967
3. 5.7 75 km SE of Chenega, Alaska · 41 km NW of this epicentre Mar 29, 1964
4. 5.7 100 km ESE of Chenega, Alaska · 27 km N of this epicentre Jul 11, 1964
5. 5.7 122 km SE of Chenega, Alaska · 9 km E of this epicentre Aug 11, 1965

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 59.3757, -146.4615. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.6 98 km SE of Chenega, Alaska 15:00 UTC
2. 1.8 106 km SE of Chenega, Alaska 12:29 UTC
3. 2.6 80 km ESE of Chenega, Alaska 04:36 UTC
4. 1.7 119 km SE of Chenega, Alaska 15:34 UTC
5. 2.1 117 km SE of Chenega, Alaska 06:54 UTC
6. 2.7 105 km SSW of Cordova, Alaska 16:36 UTC
7. 2.8 117 km SE of Chenega, Alaska 03:11 UTC
8. 2.3 109 km SE of Chenega, Alaska 00:47 UTC
9. 1.6 109 km SE of Chenega, Alaska 05:21 UTC
10. 1.8 120 km SE of Chenega, Alaska 06:04 UTC
11. 1.9 116 km SE of Chenega, Alaska 17:49 UTC
12. 2.7 112 km SE of Chenega, Alaska 05:48 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:05 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.