A Magnitude 4.2 earthquake has struck in the Canary Islands and concerns have been raised that if the Cumbre Vieja volcano erupts or otherwise shakes loose, a massive slab of rock could smash into the Atlantic Ocean causing a killer tidal wave along the entire U.S. east coast about 8 hours later.

The earthquake, from the Spanish archipelago’s most active volcano, which is located on the island of La Palma, have sparked panic across the Canary Islands, with volcano experts pulled in to examine the unusual seismic activity.