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== PRELIMINARY EARTHQUAKE REPORT ==
Cooperative New Madrid Seismic Network

Version #A: This report supersedes any earlier reports of this event.
This event has been reviewed by a seismologist.

A micro earthquake occurred at 3:01:00 AM (CDT) on Tuesday, April 22, 2008 .
The magnitude 1.6 event occurred 8 km (5 miles) E (80 degrees) of Bone Gap, IL .
The hypocentral depth is 14 km ( 8 miles).


Magnitude 1.6 - duration magnitude (Md)
Time Tuesday, April 22, 2008 at 3:01:00 AM (CDT)
Tuesday, April 22, 2008 at 8:01:00 (UTC)
Distance from Bone Gap, IL - 8 km (5 miles) E (80 degrees)
Bellmont, IL - 8 km (5 miles) N (7 degrees)
West Salem, IL - 11 km (7 miles) SE (126 degrees)
Evansville, IN - 62 km (38 miles) NNW (331 degrees)
Coordinates 38 deg. 27.6 min. N (38.460N), 87 deg. 54.0 min. W ( 87.900W)
Depth 13.7 km (8.5 miles)
Quality Good
Location Quality Parameters Nst= 7, Nph= 11, Dmin=10.8 km, Rmss=0.09 sec, Erho=1.5 km, Erzz=1.8 km, Gp=118.8 degrees
Event ID# nmhwb0422b
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