What to know about Venezuela's magnitude 7.2 and 7.5 "doublet" earthquakes.

Both quakes measured over 7.0 magnitude, with tremors being felt as far as more than a thousand miles away in Brazil’s Amazon region.

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.

A magnitude 7.1 earthquake struck near Venezuela’s coast, shaking Caracas and prompting evacuations. A tsunami threat was issued for Puerto Rico.