SAN JUAN, PR. (THECOUNT) — A powerful 5.7-magnitude earthquake shook Puerto Ricans Monday morning in the strongest quake to hit the U.S. territory over the past week.

The shaker struck just south of the island at a relatively shallow depth of 10 kilometers (over 6 miles), according to the U.S. Geological Service.

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Power outages were reported in some parts of Puerto Rico following the quake, Angel Vazquez, the emergency management director for the southern coastal city of Ponce, reports ABC7.

“This is one of the strongest quakes to date since it started shaking on Dec. 28,” he said. “It lasted a long time.”

There was no tsunami threat, officials said.

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Geo quick facts: Puerto Rico is a Caribbean island and unincorporated U.S. territory with a landscape of mountains, waterfalls and the El Yunque tropical rainforest. In San Juan, the capital and largest city, the Isla Verde area is known for its hotel strip, beach bars and casinos. Its Old San Juan neighborhood features colorful Spanish colonial buildings and El Morro and La Fortaleza, massive, centuries-old fortresses – wikipedia.