20 km ENE of Boulder City, Nevada

2019-08-07 20:46 UTC · 8.5 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: 2019-08-07 20:46 UTC
Magnitude: M 2.2 (ml)
Depth: 8.5 km below the surface
Felt: 9 reports · strongest reported intensity III
Nearest: Clark County, 37 km WNW
Status: Reviewed by a seismologist

USGS · last changed by USGS 2525 days ago · we first saw it 2525 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 9 people have reported feeling it to USGS.

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.

Where

Map loads when it scrolls into view

Epicentre 36.0712, -114.6368. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Clark County, NV	37 km (23 mi)	ESE of here	earthquakes near Clark County
Mohave County, AZ	89 km (55 mi)	WNW of here	earthquakes near Mohave County

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

Aftershocks so far

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

1.8 18 km E of Nellis Air Force Base, Nevada 10:39 UTC
1.8 18 km NE of White Hills, Arizona 02:28 UTC
2.4 11 km ESE of Enterprise, Nevada 21:50 UTC
1.8 8 km SSW of Whitney, Nevada 21:19 UTC
1.9 8 km SE of Enterprise, Nevada 22:21 UTC
1.9 10 km NW of Meadview, Arizona 04:11 UTC
2.2 7 km WNW of Meadview, Arizona 17:35 UTC
1.7 24 km E of Nellis Air Force Base, Nevada 14:00 UTC
3.3 24 km ENE of Nellis Air Force Base, Nevada 13:52 UTC
1.5 24 km E of Boulder City, Nevada 12:06 UTC
2.2 20 km NE of Nellis Air Force Base, Nevada 21:23 UTC
1.6 22 km ENE of Nellis Air Force Base, Nevada 20:17 UTC
2.1 11 km NE of Nellis Air Force Base, Nevada 04:55 UTC
2.1 8 km SE of Enterprise, Nevada 21:08 UTC
1.6 3 km WSW of Boulder City, Nevada 21:23 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 10:05 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.