50 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 10 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 5.7 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 2,600,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
3. Around the size people start to feel M 3.0 170× the energy of this one
4. This earthquake M 1.5 about 5.7 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 12 earthquakes of M5 or more within 50 km; the five largest:

1. 6.5 14 km N of Madison Junction, Wyoming · 45 km WNW of this epicentre Aug 18, 1959
2. 6.3 22 km SW of Mammoth, Wyoming · 46 km WNW of this epicentre Aug 18, 1959
3. 6.0 21 km E of West Yellowstone, Montana · 38 km W of this epicentre Aug 19, 1959
4. 5.9 26 km SSE of Mammoth, Wyoming · 25 km NW of this epicentre Jun 30, 1975
5. 5.7 13 km SSW of Mammoth, Wyoming · 43 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 44.5917, -110.3715. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.5 64 km ESE of West Yellowstone, Montana 00:21 UTC
2. 1.8 64 km ESE of West Yellowstone, Montana 00:12 UTC
3. 2.0 64 km ESE of West Yellowstone, Montana 23:52 UTC
4. 2.0 63 km ESE of West Yellowstone, Montana 21:42 UTC
5. 1.6 28 km E of West Yellowstone, Montana 11:43 UTC
6. 2.7 28 km E of West Yellowstone, Montana 17:34 UTC
7. 1.9 37 km S of Silver Gate, Montana 05:50 UTC
8. 1.7 45 km SSE of Mammoth, Wyoming 03:50 UTC
9. 1.6 27 km S of Mammoth, Wyoming 16:26 UTC
10. 2.6 28 km E of West Yellowstone, Montana 13:31 UTC
11. 1.8 27 km S of Mammoth, Wyoming 07:54 UTC
12. 2.2 17 km ENE of West Yellowstone, Montana 14:13 UTC
13. 1.6 17 km NE of West Yellowstone, Montana 19:28 UTC
14. 1.7 18 km ENE of West Yellowstone, Montana 11:11 UTC
15. 2.2 17 km ENE of West Yellowstone, Montana 05:14 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:11 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.