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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 1:55:35 AM (CDT) on Thursday, October 15, 2009 .
The magnitude 2.8 event occurred 3 km (2 miles) W of Greenbrier, AR .
The hypocentral depth is 3 km ( 2 miles).


Magnitude 2.8 - duration magnitude (Md)
Time Thursday, October 15, 2009 at 1:55:35 AM (CDT)
Thursday, October 15, 2009 at 6:55:35 (UTC)
Distance from Greenbrier, AR - 3 km (2 miles) W (270 degrees)
Wooster, AR - 5 km (3 miles) NE (43 degrees)
Twin Groves, AR - 11 km (7 miles) S (179 degrees)
North Little Rock, AR - 53 km (33 miles) NNW (345 degrees)
Coordinates 35 deg. 14.0 min. N (35.233N), 92 deg. 25.2 min. W ( 92.420W)
Depth 2.6 km (1.6 miles)
Quality Poor
Location Quality Parameters Nst= 9, Nph= 16, Dmin=64 km, Rmss=0.19 sec, Erho=4.1 km, Erzz=2 km, Gp=172.8 degrees
Event ID# nmhnw1015a
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For more information, see http://folkworm.ceri.memphis.edu/

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