Présentation des résultats de l'analyse discriminante des compositions chimiques des tephra de cinq volcans de Nouvelle-Zélande (MayorIsland, Okataina, Taupo, Tongariro et Mont Egmont) et discussion.
Geomorphology of South Atlantic VolcanicIslands. Part I: the Tristan da Cunha group
Atlantique ; Atlantique, sud ; Côte volcanique ; Géographie physique ; Géomorphologie ; Géomorphologie littorale ; Ile ; Ile volcanique ; Littoral ; Tristan da Cunha ; Volcan ; Volcanisme
Volcanoes of the Tristan Group have varied physiography resulting from the interplay of repeated volcanic eruptions, coastal erosion and fluvial erosion. The geomorphic histories of the islands are more complicated than was described in earlier
Submarine slides on volcanicislands - a source for mega-tsunamis in the Quaternary
Coastal geomorphology ; Island ; Mass movement ; Natural hazards ; Quaternary ; Sea floor ; Tsunami ; Volcanism
This paper overviews the distribution, magnitude, recurrence interval, and age of large submarine slides on volcanicislands and their potential for the generation of mega-tsunamis during the Quaternary. This paper also discusses the geomorphic
Activité volcanique ; Coulée boueuse ; Coulée de lave ; Eau de fonte ; Glaciaire ; Glacier ; Ile ; Inondation ; Islande ; Jökulhlaup ; Risque naturel ; Volcanisme
Iceland is one of the youngest territory of the Earth's surface. Together with glaciers volcanic activities contribute to another risk process called jökulhlaup. It is a large-scale flood event generated by a sudden drainage of the water contained
Geomorphic development of axial ranges in eastern North Island, New Zealand, correlated with ignimbrite volcanism in the Taupo volcanic zone
Cenozoic ; Fault ; Geomorphology ; New Zealand ; North Island ; Tectonics ; Vertical movement ; Volcanism
Cénozoïque ; Faille ; Géomorphologie ; Mouvement vertical ; North Island ; Nouvelle-Zélande ; Tectonique ; Volcanisme
ranges were still submerged. Back-arc spreading extended from the Havre Trough to central North Island c.1.8 Ma. Eruption of ignimbrite began in central North Island c.1.1 Ma., and migrated to the Taupo Volcanic Zone c.0.6 Ma. Interrupted by a period
The axial ranges of eastern North Island have grown in different processes of development north and south of the Hawke's Bay area in the Quaternary. The northern axial ranges had emerged by the early Pleistocene, when parts of the southern axial
of inactive volcanism, the eruption revived in large magnitude c.0.33 Ma.
Geomorphology of the sub-Antarctic Australian Territory of Heard Island-McDonald Island
Australia ; Climatic variation ; Coastal geomorphology ; Fluvioglacial features ; Glacial features ; Glacier ; Island ; Lava flow ; Moraine ; Periglacial features ; Sea level ; Volcanism
The geomorphology of Heard Island-McDonald Island is primarily the product of close interplay between volcanism, glaciation, and vigourous marine processes in a stormy sub-Antarctic environment. The dominant landform is the strato-volcano Big Ben
on McDonald Island. Other volcanic landforms include scoria cones, domes, open vertical volcanic conduits, lava flows and lava tubes. On Heard Island, a variety of erosional and depositional glacial landforms is present, including major lateral moraines
and extensive hummocky moraines. Integrated study of the volcanic, glacial and coastal sequences offers the possibility of constructing a well-dated record of climate change.
Stratigraphy, chronology, and paleoenvironmental reconstruction of the Quaternary sedimentary infilling of a volcanic tube in Fuerteventura, Canary Islands
C 14 dating ; Canary Islands ; Cave ; Palaeo-environment ; Palaeoclimate ; Quaternary ; Sediment filling ; Stratigraphy ; Volcanic rock
La Cueva del Llano is a volcanic tube of Pleistocene age on Fuerteventura Island, in the Canary Islands. Part of it is infilled with sediments of external origin. These deposits are exceptional in stratigraphic complexity and thickness. The aim
A group of Ar-K dating data of volcanic rocks in Taiwan Island is listed in this paper, which clarifies the data of volcanic activity. This volcanic activity is closely related with plate movement since Mesozoic. Now there are still manifestations
of volcanic actions such as hot springs or fumaroles or solfataras.
Characterising the irregular coastlines of volcanic ocean islands
Data base ; Earthquake ; Island ; Landslide ; Oceanic ridge ; Plate tectonics ; Rift ; Shoreline ; Submarine volcanism ; Tectonics ; Volcanism ; World
Volcanic ocean islands grow into irregular shapes because of eruption along radiating volcanic rift zones, caldera collapse, slope failure, coalescence of adjacent volcanoes and marine and subaerial erosion. With the aim of searching for variations
with environmental parameters which might reflect variations in these processes, this study calculates and analyses characteristics of island irregularity from the World Vector Shoreline database (a series of digitised points, nodes, representing the continuous
shorelines of the world's landmasses. The analysis also resolves the orientations of islands with respect to the tectonic fabric of their underlying oceanic basement.
Ecology ; Fauna ; Indonesia ; Island ; Population dynamics ; Vegetation ; Volcanic eruption ; Volcanism
This paper re-examines previous suggestions concerning the colonization of the Krakatau islands since the extirpating 1883 eruption that involve the more recently emergent volcanicisland Anak Krakatau, which itself suffered a devastating eruption
Considérations sur la formation et la dynamique des chambres magmatiques islandaises. Les volcans centraux sont essentiellement alimentés à partir de chambres peu profondes, elle-mêmes rechargées à partir de réservoirs situés à 8-10 km de profondeur
The main purpose of this study is to examine if the soils that are forming on volcanic materials under a dry Mediterranean climate, in Nysros Island, meet the requirements to be classified as Andisols. Soils from 7 sites were sampled and examined
A detailed study of the geomorphology of Lyttelton Volcano using primary volcanic landforms and the projection of associated orientations is used to identify multiple eruptive centres, and reinterpret the evolution of the volcano, which is now
highly modified by erosion. Individual centres are discussed, highlighting features associated with volcanic cones, such as lava flow dips and strikes, erosional crater rims, valleys, ridges, and radial dyke swarms.
Les AA. retracent l'historique des éruptions du volcan Hekla ainsi que leurs conséquences sur les êtres vivants. Comment les habitants perçoivent-ils le volcan et le volcanisme ? Quels types de risques et de dégâts ont-ils pu être observés en
liaison avec les 18 éruptions historiquement connues du volcan ?
This paper examines features of drainage and stream channel form and process on the mountainous volcanicisland of Kadavu in the humid tropical South Pacific, and interprets the findings in relation to island environmental characteristics
Biogeography ; Bird ; Fauna ; Indonesia ; Island ; Population dynamics ; Volcanic eruption ; Volcanism
The avian colonization of Anak Krakatau, an emergent volcanicisland, is described for the period 1952-1991 with emphasis on the resident land birds. The few species that had colonized the island by 1952 were destroyed in a volcanic eruption