One earthquake recorded at 3.8 magnitude by the U.S. Geological Survey
rocked houses in several communities around central Oklahoma at 7:42
a.m. local time.
Another about two hours earlier in the same part of the state, north of Oklahoma City, was recorded at 2.9 magnitude, USGS said.
Root issue: Seismologists believe the quakes may be tied to oil and gas exploration
Those two were preceded by two more, at 2.6 magnitude, and 2.5
magnitude, that also rolled the landscape in central Oklahoma early
Saturday morning.
A 3.0 magnitude tremor struck late Friday night in that area as well, following a 3.4 magnitude hit Friday afternoon.
The quakes have set record levels of seismic activity through the state
Austin Holland, a seismologist with the Oklahoma Geological Survey who
tracks earthquake activity for the USGS, said the earthquake activity in
the state is soaring.
'We have had almost as many magnitude 3 and greater already in 2014 than we did for all of 2013,' Holland said.
Last year's number of 'felt' earthquakes - those strong enough to
rattle items on a shelf - hit a record 222 in the state. This year, less
than four months into the year, the state has recorded 253 such
tremors, according to state seismic data.
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