Earthquake · reviewed by a seismologist
M 1.5ml
Earthquake near Iola, WI
No earthquake was likely felt in Iola in the 24 hours to 1:34 am CST (07:34 UTC), and no quake recorded near town since 2016 is estimated to have been strong enough to notice there. Every earthquake near Iola
This page: a magnitude 1.5 earthquake was recorded 10 km (6 mi) north-northwest of Iola, WI, at 7:11 am CDT on 11 September 2018 (12:11 UTC), 5.5 km deep.
USGS: 10 km NNW of Iola, Wisconsin
93 km (58 mi) W of Green Bay, WI
- When
- 7:11 am CDT on 11 September 2018 ()
- Where
- 10 km (6 mi) north-northwest of Iola, WI · earthquakes near Iola
- Magnitude
- M 1.5 (ml)
- Depth
- 5.5 km below the surface
- Felt
- no reports yet
- Nearest
- Waupaca County, 20 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2913 days ago
Earthquake alerts for Iola, WI
Get a notification in this browser when USGS records an earthquake near Iola, WI. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. In Iola, 10 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Amherst, Marion, Manawa, Wittenberg, Bevent, Waupaca.
How big was it?
This earthquake released about 5.4 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.
- Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 since 1900 lists no earthquake of M5 or more within 50 km.
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 44.5964, -89.1567. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Waupaca County, WI | 20 km (12 mi) | SE | earthquakes near Waupaca County |
| Portage County, WI | 30 km (19 mi) | WSW | earthquakes near Portage County |
| Shawano County, WI | 38 km (24 mi) | NE | earthquakes near Shawano County |
| Waushara County, WI | 54 km (34 mi) | S | earthquakes near Waushara County |
| Marathon County, WI | 58 km (36 mi) | NW | earthquakes near Marathon County |
| Outagamie County, WI | 58 km (36 mi) | ESE | earthquakes near Outagamie County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
No further earthquakes have been recorded within 50 km since this one.
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.