Former President Obama tweeted an appeal Sunday for people to support Puerto Rico's recovery following a series of earthquakes that have rocked the island, killing at least one person.

Why it matters: Puerto Rico's governor declared a state of emergency last Tuesday. President Trump has approved a federal disaster declaration request after two earthquakes measuring magnitudes of 6.4 and 5.8 struck — displacing many people and leaving much of the island without power. Aftershocks have since hit, and there was a magnitude 5.2 quake Friday.

Go deeper: In photos: Puerto Rico in state of emergency after back-to-back quakes