A magnitude 5.9 earthquake shook Puerto Rico Saturday morning, the most recent in a string of quakes and afterschocks that have left thousands on the island without power and water.
The 8:54 a.m. quake struck 8 miles southeast of Guanica at a shallow depth of 3 miles, according to the U.S. Geological Survey.
Earlier reports by the USGS said the quake was a magnitude 6.0 at a depth of 6 miles.
The quake caused outages across the island, including areas of Lares, Adjuntas, Ponce and San German, according to Puerto Rico’s Electric Power Authority.
There were no immediate reports of injuries.
It was the strongest quake since Tuesday’s 6.4 magnitude quake, which killed at least one person and knocked out power to virtually the entire island of more than 3 million.
Many on the island have lost their homes, and thousands remain in shelters.
Scientists say the region has been struck by an “earthquake swarm,” which is a series of earthquakes rather than the usual pattern of one dominant earthquake followed by aftershocks.
There have been nearly 1,000 earthquakes and aftershocks recorded on Puerto Rico since Dec. 31, according to the USGS. Since December, Puerto Rico has experienced more than 139 earthquakes of magnitudes greater than 3.0, including six that were greater than magnitude 5.0, the USGS said.
Over the next seven days, there is only a 3 percent chance of one or more aftershocks larger than magnitude 6.4, the USGS predicted Friday. There is, however, a high likelihood of aftershocks greater than magnitude 3.0, the USGS said.