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Ten Earthquakes Shake Puerto Rico; No Tsunami Threat

by Weatherboy Team Meteorologist - December 27, 2021

USGS reports more than 10 earthquakes in Puerto Rico in the last 24 hours; each orange dot reflects the epicenter of an earthquake. Image: USGS
USGS reports more than 10 earthquakes in Puerto Rico in the last 24 hours; each orange dot reflects the epicenter of an earthquake. Image: USGS




Ten earthquakes struck Puerto Rico in the last 24 hours; despite those shakes, there is no tsunami threat to the island, the Caribbean, or the U.S. East Coast at this time. According to USGS, most of the earthquakes struck along the southwestern portion of Puerto Rico, with a lone quake in the western part.

The earthquakes were too weak to generate a tsunami. They ranged in intensity from a magnitude 2.5 event to a 2.9 event. The 2.9 magnitude event struck near Guanica, Puerto Rico.

It is likely that today’s earthquakes are aftershocks from a seismic event that unfolded in 2020. In January 2020, a 6.4 created extensive damage in Puerto Rico, including widespread power failures across much of the island.  An earthquake swarm started here in December 2019 and the seismic unrest has continued since.




These earthquakes are occurring near  the northern edge of the Caribbean Plate, a mostly oceanic tectonic plate underlying Central America and the Caribbean Sea off of the north coast of South America.  The Caribbean Plate borders the North American Plate, the South American Plate, the Nazca Plate, and the Cocos Plate. The borders of these plates are home to ongoing seismic activity, including frequent earthquakes, occasional tsunamis, and sometimes even volcanic eruptions.

 

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