Iriga

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 13.457°N
  • 123.457°E

  • 1196 m
    3923 ft

  • 273041
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Iriga.

The Global Volcanism Program has no Weekly Reports available for Iriga.

The Global Volcanism Program has no Bulletin Reports available for Iriga.

Eruptive History


Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1628 ] [ Unknown ] Discredited    

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery


Mount Iriga is a stratovolcano whose most prominent feature is a large horseshoe-shaped caldera that is breached to the SE. It was formed by a massive volcanic landslide during an eruption that at one time was considered to have most likely occurred in 1628 CE, but was later found to have occurred earlier at some unknown time during the Holocene. The hilly terrain in the foreground, encloses small ponds on the surface of the debris-avalanche deposit.

Photo by Chris Newhall (U.S. Geological Survey).
See title for photo information.
Collapse of the summit and flanks of volcanoes during major volcanic landslides creates large horseshoe-shaped depressions that open in the direction of the landslide. This 2.1 x 3.5 km horseshoe-shaped caldera at Iriga volcano in the Philippines was produced by a massive landslide during the Holocene. The resulting debris avalanche traveled more than 10 km to the SE and flowed into Lake Buhi at the upper right. This view is from the south, with the summit of Iriga at the extreme left.

Photo by Chris Newhall (U.S. Geological Survey).
See title for photo information.
The small crater at left-center was formed at the base of the headwall of a massive landslide during an eruption during the Holocene. This view looks west into the horseshoe-shaped caldera created during the collapse, with the summit of Iriga in the background. The headwall above the crater is 600 m high.

Photo by Chris Newhall (U.S. Geological Survey).
See title for photo information.
The entire foreground area in this view of Iriga volcano in the Philippines is a massive, 1.5 cu km debris-avalanche deposit formed by a Holocene landslide from Iriga volcano in the Philippines. This view from the SE shows the typical hummocky topography of debris-avalanche deposits. Many of the darker areas are tree-covered hummocks; the irregular topography of the avalanche-deposit also encloses many small ponds.

Photo by Chris Newhall (U.S. Geological Survey).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Iriga in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites