Massive edifice failure at Aleutian arc volcanoes

Coombs, Michelle L.; White, S. M.; Scholl, David W.

doi:10.1016/j.epsl.2007.01.030

Cited by 70 publications

(67 citation statements)

References 31 publications

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“…Conversely, while dismantling and large-scale mass-wasting processes are widely detected on the submarine flanks of other active volcanic islands (e.g. Boudon, Le Friant, Komorowski, Deplus, & Semet, 2007;Coombs, White, & Scholl, 2007;Mitchell, Masson, Watts, Gee, & Urgeles, 2002;Moore, Normark, & Holcomb, 1994;Oehler, Lénat, & Labazuy, 2007;Romagnoli, Casalbore, Chiocci, & Bosman, 2009a;Romagnoli, Kokelaar, Casalbore, & Chiocci, 2009b), these features are subordinate in the offshore areas. They are mainly represented by small and medium-scale slope failures affecting the outer edge of the insular shelf, similar to that observed on nearby Faial Island (Quartau et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Bathy-morphological setting of Terceira Island (Azores) after the FAIVI cruise

et al. 2013

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High-resolution morpho-bathymetric data at 1:200,000 scale obtained during the FAIVI cruise (2011) and the resulting geomorphologic map of the Terceira island offshore area (central Azores, Portugal) are presented for the first time. The uneven morphology around Terceira is primarily related to volcanic features, such as linear and cone-shaped eruptive centres and lava flows. Such features are mostly concentrated on volcanic ridges and are aligned along preferential axes, suggesting a strong interaction between tectonics and volcanic processes. The occurrence of active tectonics is also demonstrated by systems of faults cutting the seafloor to the north, east and south of the island. Mapped erosive-depositional features include an insular shelf located at , 150 m water depth (wd), small landslide headwalls, erosive scarps, channelized features and crescent-shaped bedforms. The presented map may represent the base for a first-order geo-hazard assessment.

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Section: Discussionmentioning

confidence: 99%

Bathy-morphological setting of Terceira Island (Azores) after the FAIVI cruise

et al. 2013

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“…Prior studies have identified multiple giant submarine landslide deposits surrounding volcanic islands associCorrespondence to: C. Montanaro (cristianmontanaro@libero.it) ated with hot spot volcanism, such as the Hawaiian Islands (Moore et al, 1989(Moore et al, , 1994, Azores Islands (Holcomb and Searle, 1991), Canary Islands (Watts et al, 1995;Masson et al, 2002), Cape Verde Islands (Le Bas et al, 2007;Masson et al, 2008) and Society Islands (Clouard et al, 2001). Similar deposits have been found around volcanic islands and island arcs above subduction zones, including volcanoes in the Lesser Antilles Arc (Boudon et al, 2007), Japanese Arc (Satake and Kato, 2001), Tonga-Kermadec Arc (Wright et al, 2006), Bismark Island (Silver et al, 2009), Aeolian Island (Tibaldi, 2001;Romagnoli et al, 2009) and the Aleutian Island Arc (Coombs et al, 2007b).…”

Section: Introductionmentioning

confidence: 94%

“…In addition the same dataset of localized high resolution ship-based bathymetry used by Coombs et al (2007b) for the Kiska and Gareloi volcanoes was obtained and integrated into the bathymetric models. In many cases the bathymetric data did not have high enough accuracy or resolution or did not extend deep into the Bering Sea, so in order to define the boundaries and features of the deposits for the mapped landslide we integrated our new digital bathymetric with the GLORIA-data acquired in Bering Sea and North Pacific seafloor around the west-central Aleutians during 1986and 1987surveys (EEZ Staff, 1991.…”

Section: Methodsmentioning

confidence: 99%

“…As part of this study, adopting the same approach of Coombs et al (2007b), we made the analyses of the subaerial morphology of the source volcanoes using remotely sensed data collected during the Shuttle Radar Topography Mission (SRTM) available from the USGS Seamless Data Distribution System. We used the SRTM data set to construct DEMs of the entire western Aleutian arc study area with 1 arc second (30 m) resolution.…”

Section: Methodsmentioning

confidence: 99%

“…The swath bathymetry and side-scan data reveal a number of debris avalanche (hereafter DA) deposits; we describe each of these and discuss their volcanic and tectonic settings. As in the Coombs et al (2007b) paper we merged the submarine data with digital topography obtained from the Space Shuttle laser altimetry program in order to make a complete quantitative analyses of both the source areas and the submarine deposits of multiple Aleutian Island DAs. In some areas the only submarine data available is quite old (1930-1980s) and has low resolution or only incompletely covers the study area.…”

Section: Introductionmentioning

confidence: 99%

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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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New insights into landslide processes around volcanic islands from Remotely Operated Vehicle (ROV) observations offshore Montserrat

Watt

Jutzeler

Talling

et al. 2015

Geochem Geophys Geosyst

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Submarine landslide deposits have been mapped around many volcanic islands, but interpretations of their structure, composition, and emplacement are hindered by the challenges of investigating deposits directly. Here we report on detailed observations of four landslide deposits around Montserrat collected by Remotely Operated Vehicles, integrating direct imagery and sampling with sediment core and geophysical data. These complementary approaches enable a more comprehensive view of large-scale mass-wasting processes around island-arc volcanoes than has been achievable previously. The most recent landslide occurred at 11.5-14 ka (Deposit 1; 1.7 km 3 ) and formed a radially spreading hummocky deposit that is morphologically similar to many subaerial debris-avalanche deposits. Hummocks comprise angular lava and hydrothermally altered fragments, implying a deep-seated, central subaerial collapse, inferred to have removed a major proportion of lavas from an eruptive period that now has little representation in the subaerial volcanic record. A larger landslide (Deposit 2; 10 km 3 ) occurred at 130 ka and transported intact fragments of the volcanic edifice, up to 900 m across and over 100 m high. These fragments were rafted within the landslide, and are best exposed near the margins of the deposit. The largest block preserves a primary stratigraphy of subaerial volcanic breccias, of which the lower parts are encased in hemipelagic mud eroded from the seafloor. Landslide deposits south of Montserrat (Deposits 3 and 5) indicate the wide variety of debris-avalanche source lithologies around volcanic islands. Deposit 5 originated on the shallow submerged shelf, rather than the terrestrial volcanic edifice, and is dominated by carbonate debris.

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Massive edifice failure at Aleutian arc volcanoes

Cited by 70 publications

References 31 publications

Bathy-morphological setting of Terceira Island (Azores) after the FAIVI cruise

Bathy-morphological setting of Terceira Island (Azores) after the FAIVI cruise

Volcano collapse along the Aleutian Ridge (western Aleutian Arc)

New insights into landslide processes around volcanic islands from Remotely Operated Vehicle (ROV) observations offshore Montserrat

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