The April 9, 1917 earthquake
M5.1Southwestern Illinois
A magnitude 5.1 earthquake, centred in Monroe County. The 4th strongest in Illinois’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.
The earthquake
- Magnitude
- 5.1
- as reported (mfa)
- Depth
- —
- Not recorded
- Local time
- Monday, April 9, 1917
- 14:52 CST; 20:52 UTC
- In Illinois’s record
- 4th
- strongest of 149 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ushis610 (“Southwestern Illinois”). The USGS event page carries the ShakeMap, felt reports and the official summary.
Counties and cities within 50 miles
Distance from the epicentre to each county boundary (zero when inside) and to each city centre.
Counties
- Monroe CountyIL · inside
- Randolph CountyIL · 1.0 mi
- Ste. Genevieve CountyMO · 2.3 mi
- Jefferson CountyMO · 2.9 mi
- St. Francois CountyMO · 10.6 mi
- St. Clair CountyIL · 17.0 mi
- Perry CountyMO · 21.1 mi
- St. Louis CountyMO · 21.3 mi
- Washington CountyMO · 24.0 mi
- Washington CountyIL · 28.2 mi
- St. Louis cityMO · 30.0 mi
- Madison CountyMO · 31.8 mi
- Franklin CountyMO · 32.3 mi
- Perry CountyIL · 34.0 mi
- Jackson CountyIL · 34.2 mi
- Clinton CountyIL · 34.6 mi
- Bollinger CountyMO · 34.8 mi
- Iron CountyMO · 35.0 mi
- Madison CountyIL · 38.7 mi
- Cape Girardeau CountyMO · 39.2 mi
- St. Charles CountyMO · 44.5 mi
- Reynolds CountyMO · 46.3 mi
- Crawford CountyMO · 49.2 mi
Cities, largest first
- St. LouisMO · 37.1 mi
- FlorissantMO · 48.8 mi
- ChesterfieldMO · 43.6 mi
- BellevilleIL · 30.9 mi
- WildwoodMO · 41.6 mi
- University CityMO · 39.7 mi
- O'FallonIL · 37.8 mi
- BallwinMO · 39.1 mi
- KirkwoodMO · 35.2 mi
- Maryland HeightsMO · 45.1 mi
- Granite CityIL · 43.7 mi
- EdwardsvilleIL · 49.1 mi
Earthquakes around the epicentre
14 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.
No earlier earthquake of magnitude 5 or more within 50 miles in the catalogue since 1900.
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.