The June 10, 1987 earthquake
M5.2near Claremont, Illinois
A magnitude 5.2 earthquake 2.9 miles deep, centred in Richland County. The 2nd strongest in Illinois’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900. 2 aftershocks of magnitude 2.5 or more followed within 30 days.
The earthquake
- Magnitude
- 5.2
- duration magnitude (md)
- Depth
- 2.9 mi
- 4.6 km below the surface
- Local time
- Wednesday, June 10, 1987
- 18:48 CDT; 23:48 UTC
- In Illinois’s record
- 2nd
- strongest of 149 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event nm603116 (“2 km ESE of Claremont, Illinois”). The USGS event page carries the ShakeMap, felt reports and the official summary.
Aftershocks
Earthquakes of magnitude 2.5 or more within 20 miles of the epicentre in the 30 days after.
2
Aftershocks in 30 days
2.8
Largest aftershock, Jun 23, 1987
1
On the first day
0
In the 7 days before
- The search radius is the surface rupture length expected for an earthquake of this magnitude (Wells and Coppersmith, 1994), at least 20 and at most 600 miles, so a great earthquake's sequence is counted along its whole fault.
Counties and cities within 50 miles
Distance from the epicentre to each county boundary (zero when inside) and to each city centre.
Counties
- Richland CountyIL · inside
- Edwards CountyIL · 9.7 mi
- Jasper CountyIL · 9.7 mi
- Wabash CountyIL · 9.7 mi
- Crawford CountyIL · 9.7 mi
- Lawrence CountyIL · 9.9 mi
- Wayne CountyIL · 13.2 mi
- Clay CountyIL · 16.7 mi
- Knox CountyIN · 18.4 mi
- Gibson CountyIN · 23.3 mi
- Effingham CountyIL · 26.2 mi
- Sullivan CountyIN · 26.6 mi
- Pike CountyIN · 29.0 mi
- White CountyIL · 31.2 mi
- Cumberland CountyIL · 32.2 mi
- Clark CountyIL · 32.2 mi
- Posey CountyIN · 33.2 mi
- Daviess CountyIN · 36.2 mi
- Hamilton CountyIL · 38.8 mi
- Vanderburgh CountyIN · 40.0 mi
- Greene CountyIN · 40.5 mi
- Fayette CountyIL · 40.9 mi
- Marion CountyIL · 40.9 mi
- Vigo CountyIN · 42.3 mi
- Jefferson CountyIL · 43.6 mi
- Warrick CountyIN · 43.8 mi
- Shelby CountyIL · 44.7 mi
- Coles CountyIL · 46.3 mi
- Dubois CountyIN · 49.3 mi
- Clay CountyIN · 49.7 mi
Cities, largest first
- VincennesIN · 23.8 mi
- WashingtonIN · 42.7 mi
- EffinghamIL · 43.0 mi
Earthquakes around the epicentre
25 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.