Metro Manila (CNN Philippines, April 11) — A magnitude 6.0 earthquake rocked Batanes on Black Saturday, followed two hours later by a 5.5 magnitude quake off Davao Occidental, the Philippine Institute of Volcanology and Seismology or Phivolcs reported. There were no immediate reports of damage.

The earthquake in Batanes struck at 12:44 a.m. some 37 kilometers northeast of the provincial capital, Basco, according to Phivolcs' updated report. It had a depth of 157 kilometers.

Phivolcs amended its initial report that put the magnitude at 6.2 and the epicenter at about 16 kilometers northeast of Basco.

The shaking was felt at Intensity IV in Basco, and Itbayat. Intensity III was recorded in Tuguegarao City, Cagayan, and Luna, Apayao. Meanwhile, Intensity II tremors hit Laoag City and Pasuquin, Ilocos Norte, and Intensity I in Vigan City.

Batanes Governor Marilou Cayco said that so far there have been no reports any injury or damage from the quake.

In July last year, a deadly 5.4 earthquake also rocked Batanes, killing eight people and injuring 63 others.

Meanwhile, the magnitude 5.5 quake struck at sea 141 kilometers southeast of Jose Abad Santos, Davao Occidental at 2:45 a.m. It had a depth of 52 kilometers.

Intensity II shaking was felt in Kiamba, Alabel, and Malungon, Sarangani, while Intensity I was recorded in General Santos City, and Tupi, South Cotabato; Gingoog City, Misamis Oriental.

Phivolcs warned of possible aftershocks, but said no damage was expected for the two earthquakes. Both were tectonic in origin.