LANGSTON, Okla. (AP) -- The U.S. Geological
Survey has recorded 14 earthquakes in Oklahoma since about 9:30 p.m.
Friday, the largest being a magnitude 4.0.
The 4.0 magnitude quake was recorded at 10:05
p.m. Friday about seven miles south of Langston. Three other quakes of
magnitude 2.9, 3.0 and 3.3 were recorded Saturday afternoon in the
Medford area.
The other quakes ranged from magnitude 2.4 to 2.9.
No injuries or damage are reported.
Geologists say earthquakes of magnitude 2.5 to 3.0 are generally the smallest felt by humans.
Scientists are studying why earthquake activity
has increased in Oklahoma and whether it is connected to wastewater
disposal related to oil and gas production -- but have found no answers.