A 3.5-magnitude earthquake shook central Kansas on Wednesday, jolting an area layered over ancient volcanic rock deep below the surface.
The tremor was detected at 3.14pm ET, striking outside of Assaria, home to just a few hundred people.
Although Kansas has no active volcanoes, the region marks the southern reach of the Midcontinent Rift System, a massive tectonic event that nearly split North America apart in Earth’s distant past.
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