Emission of ash and explosions from the Etna volcano is seen on Dec. 25, 2018. (Photo: VCG)

Debris of a partially collapsed house sit on the street in Fleri, Sicily Italy, Wednesday, Dec. 26, 2018. A quake triggered by Italy's Mount Etna volcano has jolted eastern Sicily, slightly injuring 10 people and prompting frightened Italian villagers to flee their homes. (Photo: AP)

The remains of a collapsed structure are backdropped by plumes of smoke coming out Mount Etna volcano in Fleri, Sicily Italy, Wednesday, Dec. 26, 2018. (Photo: AP)

Italian Civil protection volunteers gather near the heavily damaged church of Maria Santissima as plumes of smoke come out the Mount Enta Volcano in Fleri, Sicily Italy, Wednesday, Dec. 26, 2018. (Photo: AP)

It was the biggest earthquake since the volcano rumbled to life on Monday. An ash cloud caused by the eruption also led to the temporary closure of the Sicilian airspace on Christmas Eve. (Photo: VCG)

The walls of St. Agata church, a centuries-old Roman Catholic cathedral located in Catalonia, did not escape the impact of the tremor, with photos showing pieces of bricks piling in front of the entrance. (Photo: VCG)