This week's earthquake cluster is the new normal in Oklahoma. Here's why.

A cluster of earthquakes hit Oklahoma over the past few days, unsettling thousands of the state's residents.

As of 11 a.m. ET Monday the U.S. Geological Survey says that 2,274 people reported feeling a 4.3 magnitude quake Sunday night. There have been at least 16 noticeable earthquakes (above 2.5 in magnitude) observed by the Geologic Survey since Friday, April 6.

While nerve-rattling, the quakes are normal for the area — at least since 2009. That's when the problematic quakes began, Jeremy Boak, Director of the Oklahoma Geological Survey, said in an interview. 

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