PUBLIC HEALTH EMERGENCY

The earthquakes followed a series of natural and man-made disasters to afflict the U.S. territory in recent years. The island is also going through bankruptcy and its former governor resigned amid a political scandal and massive street protests last year.

U.S. President Donald Trump on Tuesday declared an emergency in Puerto Rico and authorized the Federal Emergency Management Agency to coordinate disaster relief with Puerto Rican officials.

The U.S. Department of Health and Human Services declared a public health emergency on the island to ensure hospitals had funding to meet needs.

More than 500 tremors occurred in the south of the island between Dec. 28 and Tuesday, including 32 greater than magnitude 4.

The 6.4 magnitude quake on Tuesday morning was the most powerful to hit Puerto Rico since 1918, when a 7.3 magnitude quake and tsunami killed 116 people, according to the Puerto Rican seismology institute, Red Sismica.

Puerto Rico is accustomed to hurricanes, but powerful quakes are rare.

(Reporting by Ricardo Ortiz, Luis Valentin Ortiz, Marco Bello, Daniel Trotta and Andrew Hay Editing by Richard Chang, Robert Birsel)