A rock formation in Puerto Rico that was a popular tourist destination was reduced to rubble after the first of two powerful earthquakes rocked the island Monday.

The natural rock formation, known as "Punta Ventana" or Window Point, was a bridge in the form of a window or hole in Guayanilla on the island's southern coast.

The arch was just one of the few naturally occurring arches on the island until a 5.8-magnitude quake that struck early Monday morning off the island's southern coast caused it to collapse.

PUERTO RICO HIT WITH 6.4 MAGNITUDE EARTHQUAKE, ISLANDWIDE BLACKOUT REPORTED

The Monday morning earthquake destroyed five homes in Guánica and heavily damaged dozens of others. It also caused small landslides and power outages. The quake was followed by a string of smaller temblors.

Glidden López, a press officer for Guayanilla council, wrote on Facebook: "Playa Ventana has collapsed. Today our icon rests in everyone's memory."

Denniza Colon, a resident of Guayanilla, told the Miami Herald it was "really sad" to see the iconic arch turned into a pile of rubble after the quake.

“It was one of the biggest tourism draws of Guayanilla," she told the paper.

In an earlier post, López said the rock formation had been damaged by previous tremors in recent days. The flurry of quakes in Puerto Rico's southern region began the night of Dec. 28.

Seismologists say that shallow quakes were occurring along three faults in Puerto Rico’s southwest region: Lajas Valley, Montalva Point and the Guayanilla Canyon, as the North American plate and the Caribbean plate squeeze Puerto Rico. Monday's earthquake that brought down Punta Ventana had been the strongest yet until a 6.4-magnitude earthquake struck Puerto Rico before dawn on Tuesday.

PUERTO RICO HIT WITH 5.8 MAGNITUDE EARTHQUAKE IN LARGEST OF FLURRY OF TEMBLORS IN REGION

The 6.4-magnitude quake that left at least one man dead and eight others injured cut power to the island as power plants shut down to protect themselves. A tsunami alert was issued for Puerto Rico and the U.S. Virgin Islands after the initial quake but was later canceled.

Albert Rodríguez, who is from the southwest town of Guánica, told The Associated Press the tsunami sirens went off before officials canceled the alert. He said there is widespread damage in his neighborhood.

“The road is cracked in the middle and it lifted up,” he said.

Authorities said two plants suffered light damage, and they expected power to be restored later Tuesday. Puerto Rico's main airport was operating normally, using generator power.

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After the 10-day series of temblors, seismologists have said it's impossible to predict when the quakes will stop or whether they will get stronger.

One of the largest and most damaging earthquakes to hit Puerto Rico occurred in October 1918, when a magnitude 7.3 quake struck near the island’s northwest coast, unleashing a tsunami and killing 116 people.

The Associated Press contributed to this report.