Earthquakes Hit Oklahoma

Oct 13, 2010

Earthquakes Hit Oklahoma

Today's earthquake is not unprecedented in central Oklahoma. The region has had earthquakes at least since it was settled. Most of them were smaller. Since 1974 more than 200 earthquakes have been discovered within approximately 50 miles of today's shock. Since 1974 earthquakes roughly the size of the one this morning occurred in 1995 and on last February 27. Earthquakes big enough to cause damage are rare. Since 1882, all of Oklahoma has had 11 harmful earthquakes. The biggest of these caused moderate damage in and near El Reno in 1952.

Earthquake Details

This event has been reviewed by a seismologist.

Magnitude	4.3
Date-Time	Wednesday, October 13, 2010 at 14:06:29 UTC Wednesday, October 13, 2010 at 09:06:29 AM at epicenter Time of Earthquake in other Time Zones
Location	35.217°N, 97.271°W
Depth	7.9 km (4.9 miles) (poorly constrained)
Region	OKLAHOMA
Distances	15 km (10 miles) E of Norman, Oklahoma 35 km (20 miles) WSW of Shawnee, Oklahoma 35 km (20 miles) SE of OKLAHOMA CITY, Oklahoma 65 km (40 miles) ENE of Chickasha, Oklahoma
Location Uncertainty	horizontal +/- 6.4 km (4.0 miles); depth +/- 9 km (5.6 miles)
Parameters	NST= 32, Nph= 32, Dmin=45.9 km, Rmss=0.81 sec, Gp= 65°, M-type=teleseismic moment magnitude (Mw), Version=V
Source	USGS NEIC (WDCS-D)
Event ID	us2010ciay

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