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PIEDMONT GEOMORPHOLOGY OF IWAKI VOLCANO

Caldeira ; Cours d'eau ; Drainage antéconséquent ; Géographie physique ; Hydrologie ; Lyttelton Volcano ; Nouvelle-Zélande ; Réseau de drainage ; South Island ; Terminologie ; Volcan
Drainage on the north and west flanks of the Miocene Lyttelton Volcano does not have the expected radial and consequent pattern. It is proposed that the term anteconsequent, previously used in the context of orogenesis and erosion, should
be extended to cover the situation described on the Lyttelton Volcano.

Nisyros volcano

Salt fretting in the valley cliff of the Asama volcano region, Japan
On the pumice flow deposits of the Asana volcano, Japan, many salts such as halite, gypsum, hexahydrite and mirabilite crystallize at the base of south-facing valley cliffs. The zone of salt efflorescence and of resulting polygonal rind correspond

Pleistocene glaciation of volcano Ajusco, central Mexico, and comparison with the standard Mexican glacial sequence
; Néoglaciaire ; Pléistocène ; Profil pédologique ; Quaternaire zone chaude ; Stratigraphie ; Tephra ; Volcano Ajusco ; Zone intertropicale

Jég-és jelenkori tüzhanyok a Cascade-hegységben I. A Mount St. Helens 1980. évi kitorése. (Pleistocene and Holocene volcanoes in the Cascade Mountains. I. Eruption of Mount St. Helens in 1980)
The diary of the destructive eruption is presented and the prehistory of the volcano is reconstructed from available data. The author observed the impact on the spot, a year after the catastrophe.

The eruption of Soufrière volcano, St Vincent April-June 1979
The Soufrière volcano in St Vincent began to erupt on 13 April 1979 after 10 months of mild premonitory activity. A series of strong vertical explosions between 13 and 26 April, generated ash falls, pyroplastic flows and mudflows. From about 3 May

Discriminant function analysis of late Quaternary tephras from five volcanoes in New Zealand using glass shard major element chemistry

Pyroclastic studies can help determine the internal plumbing systems and magma release mechanisms of volcanoes, for example where they yield the magma output rate and provide evidence for magma mixing, and fall deposits supply the best means
of studying compositionally-zoned magma chambers. They are also important in volcanic hazard studies, where the past pattern of explosive activity is used as a guide to the probable future behaviour of a volcano.

Earth tides, volcanoes and climatic change

The discovery of numerous volcanoes is disclosed in volcanic area in the South of Kivu lake. These volcanoes are mostly lined up on N-S faults, the direction of the rift of Central Africa. A new chronostratigraphic sequence is proposed

L'évolution structurale de l'Etna (Sicile) et les modalités du contrôle tectonique et volcano-tectonique de son activité. Faits et hypothèses après les éruptions de 1978 et 1979. (Structural evolution of Mount Etna (Sicily) and modalities of its
activity tectonic and volcano-tectonic control. Facts and hypothesis after the 1978 and 1979 eruptions)

Comparaison des dates des phases explosives et volcano-plutoniques avec les enregistrements de paléotempératures et les glaciations au cours du Néogène. On trouve une bonne corrélation. (CM).

Activité volcanique explosive et calotte glaciaire : le cas des lahars du Nevado del Ruiz, Colombie (13 Novembre 1985) et l'évaluation des risques volcano-glaciaires in Catastrophes et risques naturels.

Volcanoes in space and time

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