Regional stress influence on the opening direction of crater amphitheaters in Southeast Asian volcanoes

Lagmay, A. M. F. A.; Valdivia, W.

doi:10.1016/j.jvolgeores.2006.04.020

Cited by 30 publications

(14 citation statements)

References 21 publications

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“…We found a clear relationship between the orientation of fault systems underlying the Aleutian volcanoes and the opening direction of the amphitheatre scarps left by DAs (Lagmay and Valdivia, 2006) supporting the idea of a tectonic control on the genesis of these deep-seated failure. Most of the Aleutian Volcanoes described here have landslide scarp openings perpendicular to the strike of regional normal fault systems (Francis and Self, 1987;Acocella, 2005) or an angular relationship between the direction of collapse scarp opening and the underlying strike-slip fault (Lagmay and Valdivia, 2006). Some important differences also exist in the type of landslides produced at Aleutian volcanoes.…”

Section: Discussionsupporting

confidence: 72%

Volcano collapse along the Aleutian Ridge (western Aleutian Arc)

Montanaro

Begét

2011

Nat. Hazards Earth Syst. Sci.

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Abstract. The Aleutian Ridge, in the western part of the Aleutian Arc, consists of a chain of volcanic islands perched atop the crest of a submarine ridge with most of the active Quaternary stratocones or caldera-like volcanoes being located on the northern margins of the Aleutian Islands. Integrated analysis of marine and terrestrial data resulted in the identification and characterization of 17 extensive submarine debris avalanche deposits from 11 volcanoes. Two morphological types of deposits are recognizable, elongate and lobate, with primary controls on the size and distribution of the volcanic debris being the volume and nature of material involved, proportion of fine grained material, depth of emplacement and the paleo-bathymetry. Volume calculations show the amount of material deposited in debris avalanches is as much as three times larger than the amount of material initially involved in the collapse, suggesting the incorporation of large amounts of submarine material during transport. The orientation of the collapse events is influenced by regional fault systems underling the volcanoes. The western Aleutian Arc has a significant tsunamigenic potential and communities within the Aleutian Islands and surrounding areas of the North Pacific as well as shipping and fishing fleets that cross the North Pacific may be at risk during future eruptions in this area.

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Section: Discussionsupporting

confidence: 72%

Volcano collapse along the Aleutian Ridge (western Aleutian Arc)

Montanaro

Begét

2011

Nat. Hazards Earth Syst. Sci.

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“…Van Wyk de Vries and Merle (1998) and Lagmay et al (2000) studied the effects of transcurrent faulting on the volcanoes by performing analogue model experiments that demonstrated that edifices instability can be triggered by an underlying active strike-slip fault. The instability and consequent landslides were oriented approximately 10°-30°f rom the trend of the main strike-slip fault (Lagmay et al, 2000;Wooller et al, 2009;Norini and Lagmay, 2005;Lagmay and Valdivia, 2006;Norini et al, 2008).…”

Section: Role Of Regional Tectonicsmentioning

confidence: 99%

A possible link between faulting, cryptodomes and lateral collapses at Vesuvius Volcano (Italy)

Milia¹,

Torrente²,

Bellucci³

2012

Global and Planetary Change

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“…Three of these deposits (San Antonio, La Vega and San Rafael) have an angular difference between the σ max stress and their dispersal axis or the opening direction of the amphitheaters of 40°±5. Lagmay and Valdivia (2006) have reported that certain Asian volcanoes, stress-related collapse occurs at orientations forming acute angles to the σ max stress regime. Thus it appears that Tacaná has formed in an environment with normal and transtensional faulting, similar to what Tibaldi and Lagmay (2006) have observed elsewhere.…”

Section: Amentioning

confidence: 99%

Late-Pleistocene flank collapse triggered by dome growth at Tacaná volcano, México-Guatemala, and its relationship to the regional stress regime

et al. 2009

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During late Pleistocene time, the extrusion of an andesitic dome at the summit of Tacaná volcano caused the collapse of its northwestern flank. The stratocone collapse was nearly parallel to the σ min stress direction suggesting that failure was controlled by the regional stress field. The event produced a debris avalanche that was channelized in the San Rafael River and moved 8 km downstream. The deposit covered a minimum area of 4 km 2 , had a volume of 0.8±0.5 km 3 , with an H/L (vertical drop to horizontal transport distance ratio) of 0.35, defining a degree of mobility that is atypical for volcanic debris avalanches. The flank failure undermined the summit dome leading to its collapse and the generation of a series of block-and-ash flows that were emplaced in quick succession and covered the avalanche surface. The collapse event left a 600-m-wide summit amphitheatre with a 30-degree opening to the northwest, and >200 m thick debris that blocked the San Rafael River. Remobilization of this material produced debris flows that eroded the primary deposits and cascaded into the Coatán River.After the collapse, the activity of Tacaná continued with the emission of the Agua Zarca lava flow dated at 10±6 ka ( 40 Ar/ 39 Ar), and pyroclastic surges dated at 10,610+330/ −315 yr BP ( 14 C), which provide a minimum age for the collapse event. During the Holocene, Tacaná has been very active producing explosive and effusive eruptions that ended with the extrusion of two summit domes that today occupy the amphitheatre. The 1950 and 1986 phreatic outbursts occurred along the Pleistocene collapse scar. Currently~300,000 inhabitants live within a 35 km radius of Tacaná, and could conceivably be impacted by future events of similar magnitude.

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Regional stress influence on the opening direction of crater amphitheaters in Southeast Asian volcanoes

Cited by 30 publications

References 21 publications

Volcano collapse along the Aleutian Ridge (western Aleutian Arc)

Volcano collapse along the Aleutian Ridge (western Aleutian Arc)

A possible link between faulting, cryptodomes and lateral collapses at Vesuvius Volcano (Italy)

Late-Pleistocene flank collapse triggered by dome growth at Tacaná volcano, México-Guatemala, and its relationship to the regional stress regime

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