Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Madison, OH
USGS: 3 km W of Madison, Ohio
59 km (37 mi) ENE of Cleveland, OH
- When
- 10:27 pm EDT on 27 September 2023 ()
- Where
- 3 km (2 mi) W of Madison, OH · earthquakes near Madison
- Magnitude
- M 1.7 (ml)
- Depth
- 5.0 km below the surface
- Felt
- 2 reports · strongest reported intensity III
- Nearest
- Lake County, 9 km W
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1028 days ago
A magnitude 1.7 earthquake was recorded 3 km (2 mi) W of Madison, OH, at 10:27 pm EDT on 27 September 2023 (02:27 UTC). 2 people have reported feeling it to USGS. 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, Painesville, Geneva-on-the-Lake, Fairport Harbor, Chardon.
How big was it?
This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 89× the energy of this one
- This earthquake M 1.7 about 11 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
The largest earthquake within 50 km since 2016 was M 4.0 on 2019-06-10 — about 2,800 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.0 4 km NNW of Chardon, Ohio · 15 km SSW 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 41.7702, -81.0877. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, OH | 9 km (6 mi) | W | earthquakes near Lake County |
| Geauga County, OH | 31 km (19 mi) | SSW | earthquakes near Geauga County |
| Ashtabula County, OH | 32 km (20 mi) | ENE | earthquakes near Ashtabula County |
| Cuyahoga County, OH | 49 km (31 mi) | WSW | earthquakes near Cuyahoga County |
| Trumbull County, OH | 58 km (36 mi) | SSE | earthquakes near Trumbull County |
| Portage County, OH | 67 km (42 mi) | S | earthquakes near Portage County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
24 earthquakes have been recorded within 50 km since this one.
- 2.0 1 km W of North Perry, Ohio
- 2.0 3 km SE of Madison, Ohio
- 2.2 5 km W of Rock Creek, Ohio
- 2.1 2 km SE of Madison, Ohio
- 2.2 6 km SE of Madison, Ohio
- 2.3 4 km SE of Madison, Ohio
- 2.9 3 km SW of Madison, Ohio
- 2.2 3 km SSE of Madison, Ohio
- 2.7 4 km ENE of North Madison, Ohio
- 2.3 2 km SSE of Madison, Ohio
- 2.5 4 km ESE of Madison, Ohio
- 2.0 2 km ESE of Madison, Ohio
- 1.8 5 km NW of Lakeline, Ohio
- 2.2 2 km ESE of Madison, Ohio
- 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
- 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.