Iraya is an active stratovolcano on Batan Island, 200 km north of Luzon, Philippines. It is the northernmost active volcano in the Philippines. Its last eruption probably happened in 1454 AD, but little details are known about this eruption.
It seems that Iraya volcano's eruptions were exclusively explosive, forming many pyroclastic flows. There are no lava flows.
In 1998, an earthquake swarm occurred beneath the volcano.
The morphologically young Iraya volcano is the most prominent feature of the 20-km-long Batan island. It has a 1.5-km-wide summit crater largely filled by a younger cone that forms the present-day summit. 2 older volcanoes form the rest of Batan Island:
Mahatao volcano is the oldest and was active until the late Miocene (ca. 5 million years ago), and forms the center of Batan Island. Matarem volcano in the south was active until about 2 million years ago (early Pleistocene).
Iraya belongs to the Babuyan Segment, the least evolved of 4 segments of the Luzon volcanic arc. It has developed on the western part of the Philippine plate, where the South China oceanic and Eurasian plates are being subducted along the Manila Trench.
There are three volcanoes on Batan Island. Iraya volcano is located in the north of the island and has been active since Late Pleistocene.
- Defant et al (1989) "Geochemistry and tectonic setting of the Luzon arc, Philippines", GSA Bulletin May 1989, v. 101 (5), pp 663-672
- Arai et al (2004) "Petrology of Peridotite Xenoliths from Iraya Volcano, Philippines, and its Implication for Dynamic Mantle-Wedge Processes" J. Petrology V 45 (2), pp 369-389
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