Globe and Mail: Listening to the planet’s story, right down to its roots
Ivan Semeniuk, the Globe and Mail‘s science reporter, wrote about an international effort to study North America’s seismic activity.
He quotes a U of M professor:
“You can’t understand something until you see it,” says Andrew Frederiksen, a seismologist at the University of Manitoba who was involved in a follow-up experiment called SPREE (Superior Province Rifting Earthscope Experiment). It entailed placing additional seismic stations all around Lake Superior to better map a billion-year old feature known as the mid-continent rift, where the tectonic plate on which North America rests once started pulling itself apart but then stopped.