April 5 (Reuters) – Earthquakes rattled residents in Oklahoma on Saturday, the latest in a series that have put the state on track for record quake activity this year, which some seismologists say may be tied to oil and gas exploration.
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.
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.
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.
"We have already crushed last year's record for number of earthquakes," Holland said.
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