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Every plate-boundary spreading center is a potential colonization area.

The zone is what seismologists call a “spreading center” with faults that slowly stretch the earth.

The volcanic spreading center — more than 300 miles long — lies in a slanted line off the West Coast, from British Columbia to Oregon.

Huybers and his colleagues are now working to tease out the ice age signal from another medium-rate spreading center, the Juan de Fuca Ridge, off the coast of the U.S.

The study in Science was based on fresh ocean-floor data gathered by a Korean icebreaker ship during 2011 and 2013 surveys across the Australian-Antarctic ridge, a spreading center south of Tasmania.