SAN JUAN, Puerto Rico (AP) — The two powerful earthquakes that struck Venezuela’s northern coast, killing more than 180 people, were an event known as a “doublet.”

A 7.2-magnitude earthquake and a 7.5-magnitude were less than a minute apart, said the U.S. Geological Survey. The second earthquake was the largest to hit the country since 1900.

It appears the two big earthquakes in Venezuela that occurred in rapid succession may have involved two separate fault lines. Several faults intersect in this tectonically complex…