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Wednesday, October 3, 2012


Iraya volcano is located on Batan Island, 200 km north of Luzon, Philippines. The volcano belongs to the Babuyan Segment, the least evolved of four segments of the Luzon arc.
The Babuyan Segment has developed on the western part of the Philippine Sea plate, which is subducted by the South China Sea plate and the Eurasian plate along the Manila Trench.
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There are three volcanoes on Batan Island. Mahatao volcano is the oldest and is located in central Batan. It last erupted in the Late Miocene. Matarem volcano in the south of the island erupted in the Pliocene to Early Pleistocene. Iraya volcano is located in the north of the island and has been active since Late Pleistocene.
Eruptions at Iraya volcano have been Pelean, pyroclastic flows and lava flows.
In 1998 there was an earthquake swarm at the volcano. -
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The morphologically youthful Iraya volcano, at the north end of Batan Island, is the northernmost active volcano in the Philippines. Iraya is the most prominent feature of the 20-km-long, dumbbell-shaped Batan island, located in the Luzon Strait between Luzon and Taiwan. The 1009-m-high Quaternary stratovolcano has a 1.5-km-wide summit crater, which is largely filled by a younger cone that forms the summit of the volcano. Observed late-Pleistocene and Holocene products of Iraya are exclusively explosive. The youngest dated unit of Iraya is a pyroclastic-flow deposit radiocarbon dated at about 1500 years ago (Richard et al., 1986). The Philippines Institute of Volcanology and Seismology (2004-) listed an eruption in 1454 AD of unspecified character.-
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