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.
Location35.217°N, 97.271°W
Depth7.9 km (4.9 miles) (poorly constrained)
Distances15 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 Uncertaintyhorizontal +/- 6.4 km (4.0 miles); depth +/- 9 km (5.6 miles)
ParametersNST= 32, Nph= 32, Dmin=45.9 km, Rmss=0.81 sec, Gp= 65°,
M-type=teleseismic moment magnitude (Mw), Version=V
Event IDus2010ciay