4 km NNW of Medford, Oklahoma

2016-11-25 15:19 UTC · 7.9 km deep · released about 15 tons 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: 2016-11-25 15:19 UTC
Magnitude: M 4.0 (mb)
Depth: 7.9 km below the surface
Felt: 260 reports · strongest reported intensity V
Measured shaking: intensity IV (ShakeMap)
USGS impact alert: green
Nearest: Grant County, 7 km SSW
Status: Reviewed by a seismologist

USGS · last changed by USGS 2382 days ago · we first saw it 2382 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 260 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

Northridge, California 1994 M 6.7 11,000× the energy of this one
Mineral, Virginia 2011 M 5.8 500× the energy of this one
Magna, Utah 2020 M 5.7 350× the energy of this one
This earthquake M 4.0 about 15 tons of TNT
Around the size people start to feel M 3.0 this one released 32× more

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 36.8434, -97.7522. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Grant County, OK	7 km (4 mi)	NNE of here	earthquakes near Grant County
Harper County, KS	47 km (29 mi)	SE of here	earthquakes near Harper County
Sumner County, KS	49 km (31 mi)	SSW of here	earthquakes near Sumner County
Garfield County, OK	52 km (32 mi)	N of here	earthquakes near Garfield County
Alfalfa County, OK	52 km (33 mi)	ENE of here	earthquakes near Alfalfa County
Kay County, OK	54 km (34 mi)	W of here	earthquakes near Kay 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.

2.8 10 km W of Lamont, Oklahoma 08:29 UTC
3.2 10 km W of Lamont, Oklahoma 20:39 UTC
2.5 10 km W of Lamont, Oklahoma 20:23 UTC
1.5 11 km W of Caldwell, Kansas 15:34 UTC
3.0 6 km E of Renfrow, Oklahoma 02:02 UTC
1.8 6 km S of Harper, Kansas 00:49 UTC
1.8 Kansas 07:07 UTC
2.5 6 km WSW of Bluff City, Kansas 05:44 UTC
2.2 8 km ENE of Bluff City, Kansas 04:40 UTC
1.6 Kansas 04:29 UTC
1.8 9 km W of Bluff City, Kansas 09:31 UTC
2.6 5 km S of Nash, Oklahoma 03:37 UTC
1.8 5 km ESE of Freeport, Kansas 08:35 UTC
1.9 3 km SSE of Danville, Kansas 23:43 UTC
1.5 7 km S of Anthony, Kansas 00:45 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 07:27 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.