Move over California, there’s a new earthquake capital.

According to the Center for Investigative Reporting, Oklahoma had three times as many earthquakes as California and remains well ahead in 2015.

Hydraulic facturing, or fracking, the process of drilling and injecting fluid into the ground at a high pressure to fracture shale rocks to release natural gas inside, is believed to be the major factor in increasing seismic activity in the Midwest.

(MORE: Big Oil and Bad Air on the Texas Prairie)

Though earthquakes have proven more deadly on the West Coast, none in the Midwest have resulted in deaths, the report notes.

The largest Midwest quake in recent years – a magnitude 5.7 – was centered near Prague, Oklahoma, on Nov. 5, 2011, according to the U.S. Geological Survey.

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