Mount Iriga volcano is a small stratovolcano immediately SW of Lake Buhi in southern Luzon, Philippines.
The volcano is dominantly andesitic in composition, but has several basaltic flank cones. It has a large crater breached to the SE, which formed during a massive flank failure that produced a large debris avalanche which buried several villages and formed a hilly, irregular deposit on the plain south of Lake Buhi 4 km from the summit.
Background:
Iriga is part of the Bicol volcanic arc which comprises at least 12 volcanic vents and complexes and is one of the 3 historically active, but the least active centers of the arc (the other 2 being Mayon and Bulusan). Iriga has only 2 known recorded eruptions in historic times.
The catastrophic debris avalanche of Iriga volcano had been believed to have occurred during the 1628 AD eruption, but later work has now shown that the collapse and eruption occurred earlier at some unknown date in the past few thousands years. The avalanche was followed by phreatic explosions that created a small crater at the base of the scarp.
SOURCE: http://www.volcanodiscovery.com/iriga.htmlThe catastrophic debris avalanche of Iriga volcano had been believed to have occurred during the 1628 AD eruption, but later work has now shown that the collapse and eruption occurred earlier at some unknown date in the past few thousands years. The avalanche was followed by phreatic explosions that created a small crater at the base of the scarp.
Photo from: http://www.volcano.si.edu/volcano.cfm?vn=273041
Mount Iriga, also known as Mount Asog, is one of the active volcanos in the Philippines, in the province of Camarines Sur, in the Philippines.
Mount Iriga is a stratovolcano about a kilometre from Lake Buhi. It rises 1,196 m (3,924 ft) with a base diameter of 10 kilometres.
Iriga erupted in 1628 and 1642. Iriga is generally known for its phreatic explosions.
SOURCE: http://wikipedia.org
Iriga volcano is located in southern Luzon, Philippines. The Bicol Arc is composed of at least twelve volcanic centers and complexes that include three active volcanoes (Mayon, Iriga and Bulusan). Iriga is the least active of the three active volcanoes having had only two eruptions recorded throughout its history.
The southern flank of Iriga has collapsed previously, causing a debris avalanche which traveled several kilometres, damming a river and creating a lake.
A left-lateral strike-slip fault passes under Iriga volcano.
Crater lake Buhi is located 4 km east of the summit. The lake is the home to the world's smallest edible commercial fish - Sinarapan (Mistichthys luzonensis).
The hazards at Iriga volcano are lava flows, pyroclastic flows, airfall tephra, debris avalanche and lahars.
SOURCE: http://www.volcanolive.com/iriga.html
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