38 km SSE of Mammoth, Wyoming

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 9 km (6 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 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
3. Around the size people start to feel M 3.0 150× the energy of this one
4. This earthquake M 1.5 about 6.2 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 4.2 on 2022-05-11 — about 10,000 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

1. 6.5 14 km N of Madison Junction, Wyoming · 35 km WNW of this epicentre Aug 18, 1959
2. 6.3 22 km SW of Mammoth, Wyoming · 35 km WNW of this epicentre Aug 18, 1959
3. 6.0 21 km E of West Yellowstone, Montana · 29 km W of this epicentre Aug 19, 1959
4. 5.9 26 km SSE of Mammoth, Wyoming · 13 km NW of this epicentre Jun 30, 1975
5. 5.7 13 km SSW of Mammoth, Wyoming · 31 km NW of this epicentre Aug 18, 1959

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 44.6725, -110.4697. Map © OpenStreetMap contributors.

Nearby places

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

1. 1.6 50 km ESE of West Yellowstone, Montana 10:28 UTC
2. 2.0 50 km ESE of West Yellowstone, Montana 10:09 UTC
3. 2.1 38 km S of Silver Gate, Montana 23:43 UTC
4. 1.9 49 km SE of West Yellowstone, Montana 10:15 UTC
5. 1.7 48 km SE of West Yellowstone, Montana 10:13 UTC
6. 1.9 48 km SE of West Yellowstone, Montana 10:00 UTC
7. 1.6 47 km SE of West Yellowstone, Montana 09:48 UTC
8. 1.8 47 km SE of West Yellowstone, Montana 09:37 UTC
9. 1.8 24 km SSE of West Yellowstone, Montana 18:28 UTC
10. 1.9 21 km SSE of Mammoth, Wyoming 20:17 UTC
11. 2.7 23 km SSW of Mammoth, Wyoming 04:06 UTC
12. 2.1 23 km SSW of Mammoth, Wyoming 04:05 UTC
13. 1.7 23 km SSW of Mammoth, Wyoming 20:36 UTC
14. 1.7 23 km SSW of Mammoth, Wyoming 09:41 UTC
15. 1.6 23 km SSW of Mammoth, Wyoming 12:42 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 21:59 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.