Earthquake Details
Magnitude 5.4 (Preliminary magnitude — subject to revision)
Date-Time Friday, April 18, 2008 at 09:36:57 UTC
Friday, April 18, 2008 at 04:36:57 AM at epicenter
Location 38.501°N, 87.898°W
Depth 10 km (6.2 miles) set by location program
Region ILLINOIS
Distances 10 km (6 miles) ESE (103°) from West Salem, IL
10 km (6 miles) NE (55°) from Bone Gap, IL
13 km (8 miles) N (4°) from Bellmont, IL
39 km (24 miles) WSW (239°) from Vincennes, IN
66 km (41 miles) NNW (333°) from Evansville, IN
204 km (127 miles) E (93°) from St. Louis, MO
Location Uncertainty Error estimate not available
Parameters NST=021, Nph=021, Dmin=263.2 km, Rmss=1.07 sec, Gp=119°,
M-type=moment magnitude (Mw), Version=1
Source West Coast and Alaska Tsunami Warning Center/NOAA/NWS
Event ID at00851141
I would have guessed closer to 6.