4 km E of Bluff City, Kansas

2018-10-13 11:35 UTC · 6.8 km deep · released about 14 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: 2018-10-13 11:35 UTC
Magnitude: M 1.8 (ml)
Depth: 6.8 km below the surface
Felt: no reports yet
Nearest: Harper County, 25 km WNW
Status: Reviewed by a seismologist

USGS · last changed by USGS 2903 days ago · we first saw it 2903 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
Magna, Utah 2020 M 5.7 790,000× the energy of this one
Around the size people start to feel M 3.0 70× the energy of this one
This earthquake M 1.8 about 14 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 37.0792, -97.8220. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Harper County, KS	25 km (15 mi)	ESE of here	earthquakes near Harper County
Grant County, OK	32 km (20 mi)	N of here	earthquakes near Grant County
Sumner County, KS	34 km (21 mi)	WSW of here	earthquakes near Sumner County
Alfalfa County, OK	59 km (37 mi)	NE of here	earthquakes near Alfalfa County
Kingman County, KS	60 km (37 mi)	SSE of here	earthquakes near Kingman County
Kay County, OK	67 km (42 mi)	WNW of here	earthquakes near Kay County

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

Aftershocks so far

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

4.0 4 km ENE of South Haven, Kansas 03:34 UTC
2.5 6 km N of Wakita, Oklahoma 07:21 UTC
2.9 2 km ENE of Medford, Oklahoma 16:43 UTC
1.7 7 km SE of Harper, Kansas 10:21 UTC
2.3 4 km SSW of Conway Springs, Kansas 10:32 UTC
2.4 10 km E of Nescatunga, Oklahoma 09:42 UTC
1.6 12 km SSW of Milan, Kansas 19:16 UTC
1.9 1 km NW of Freeport, Kansas 05:04 UTC
3.1 0 km SE of Wakita, Oklahoma 23:20 UTC
2.4 12 km W of Belle Plaine, Kansas 20:36 UTC
1.6 6 km NE of Anthony, Kansas 05:25 UTC
1.7 8 km WSW of Hunnewell, Kansas 07:16 UTC
1.6 8 km WSW of Hunnewell, Kansas 06:51 UTC
2.6 3 km NNW of Braman, Oklahoma 08:36 UTC
2.6 8 km SE of Byron, Oklahoma 21:42 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:51 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2018-06-09 — it released about 8,800 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.