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Bulletin of Volcanology

, Volume 74, Issue 9, pp 2067–2081 | Cite as

Volcano-tectonic controls and emplacement kinematics of the Iriga debris avalanches (Philippines)

  • E. M. R. PaguicanEmail author
  • B. van Wyk de Vries
  • A. M. F. Lagmay
Research Article

Abstract

Mt Iriga in southeastern Luzon is known for its spectacular collapse scar that was possibly created in 1628 ad by a 1.5-km3 debris avalanche. The debris avalanche deposit (DAD) covered 70 km2 and dammed the Barit River to form Lake Buhi. The collapse has been ascribed to a non-volcanic trigger related to a major strike-slip fault under the volcano. Using a combination of fieldwork and remote sensing, we have identified a similar size, older DAD to the southwest of the edifice that originated from a sector oblique to the underlying strike-slip fault. Both deposits cover wide areas of low, waterlogged plains, to a distance of about 16 km for the oldest and 12 km for the youngest. Hundreds of metre-wide and up to 50-m-high hummocks of intact conglomerate, sand and clay units derived from the base of the volcano show that the initial failure planes cut deep into the substrata. In addition, large proportions of both DAD consist of ring-plain sediments that were incorporated by soft-sediment bulking and extensive bulldozing. An ignimbrite unit incorporated into the younger DAD forms small (less than 5 m high) discrete hummocks between the larger ones. Both debris avalanches slid over water-saturated soft sediment or ignimbrite and spread out on a basal shear zone, accommodated by horst and graben formation and strike-slip faults in the main mass. The faults are listric and flatten into a well-developed basal shear zone. This shear zone contains components from the substrate and has a diffuse contact with the intact substrata. Long, transport-normal ridges in the distal parts are evidence of compression related to deceleration and bulldozing. The collapse orientation and structure on both sectors and DAD constituents are consistent with collapse being a response to combined transtensional faulting and gravity spreading. Iriga can serve as a model for other volcanoes, such as Mayon, that stand in sedimentary basins undergoing transtensional strike-slip faulting.

Keywords

Mt Iriga Debris avalanche deposit Volcano-tectonics Transtensional faulting Emplacement kinematics 

Notes

Acknowledgments

This study is a result of the co-tutelle PhD programme between the Université Blaise Pascal and the University of the Philippines. Funding was provided by the French Embassy in Manila and the EIFFEL Excellence Scholarship. Gerard ‘Titan’ Quina, Cathy Abon, Caloy Arcilla (NIGS Director), Meryl Calibo, Analiza and Jerry Morada and the family of Buhi, Camarines Sur, and Grace Bato provided invaluable field assistance and logistics support. Comments and reviews by Lee Siebert and an anonymous reviewer improved the manuscript. Editorial review by Professor Jocelyn McPhie was especially valuable and appreciated.

Supplementary material

445_2012_652_MOESM1_ESM.zip (371.5 mb)
ESM 1 (ZIP 371 MB)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • E. M. R. Paguican
    • 1
    • 2
    • 3
    • 4
    Email author
  • B. van Wyk de Vries
    • 1
    • 2
    • 3
    • 4
  • A. M. F. Lagmay
    • 4
  1. 1.Laboratoire Magmas et VolcansClermont Université, Université Blaise PascalClermont-FerrandFrance
  2. 2.CNRS, UMR 6524, LMVClermont-FerrandFrance
  3. 3.IRD, R 163, LMVClermont-FerrandFrance
  4. 4.National Institute of Geological Sciences, College of ScienceUniversity of the PhilippinesQuezon CityPhilippines

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