QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Madison, OH

USGS: 6 km S of Madison, Ohio

59 km (37 mi) ENE of Cleveland, OH

5:43 am EDT, Sep 4, 2018 · · 5.0 km deep · released about 6.4 lb of TNT

Every earthquake near Madison Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 15 kmGeauga County 26 kmAshtabula County 33 kmCuyahoga County 50 kmTrumbull County 51 kmPortage County 62 kmSummit County 77 kmCrawford County 78 kmMercer County 80 km
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
5:43 am EDT on 4 September 2018 ()
Where
6 km (4 mi) S of Madison, OH · earthquakes near Madison
Magnitude
M 1.6 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Lake County, 15 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2950 days ago

A magnitude 1.6 earthquake was recorded 6 km (4 mi) S of Madison, OH, at 5:43 am EDT on 4 September 2018 (09:43 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Perry, North Madison, Chardon, Painesville, Geneva-on-the-Lake, Fairport Harbor.

How big was it?

This earthquake released about 6.4 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 2,400,000× 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 1.6 about 6.4 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 one earthquake of M5 or more within 50 km:

  1. 5.0 4 km NNW of Chardon, Ohio · 12 km SW of this epicentre

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 41.7132, -81.0430. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lake County, OH 15 km (9 mi) WNW earthquakes near Lake County
Geauga County, OH 26 km (16 mi) SSW earthquakes near Geauga County
Ashtabula County, OH 33 km (20 mi) NE earthquakes near Ashtabula County
Cuyahoga County, OH 50 km (31 mi) WSW earthquakes near Cuyahoga County
Trumbull County, OH 51 km (31 mi) SSE earthquakes near Trumbull County
Portage County, OH 62 km (38 mi) SSW earthquakes near Portage County

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

Aftershocks so far

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

  1. 2.0 1 km W of North Perry, Ohio
  2. 2.0 3 km SE of Madison, Ohio
  3. 2.2 5 km W of Rock Creek, Ohio
  4. 2.1 2 km SE of Madison, Ohio
  5. 2.2 6 km SE of Madison, Ohio
  6. 2.3 4 km SE of Madison, Ohio
  7. 2.9 3 km SW of Madison, Ohio
  8. 2.2 3 km SSE of Madison, Ohio
  9. 2.7 4 km ENE of North Madison, Ohio
  10. 2.3 2 km SSE of Madison, Ohio
  11. 2.5 4 km ESE of Madison, Ohio
  12. 2.0 2 km ESE of Madison, Ohio
  13. 1.8 5 km NW of Lakeline, Ohio
  14. 2.2 2 km ESE of Madison, Ohio
  15. 1.7 1 km ESE of Madison, Ohio

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

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.