A group of Ar-K dating data of volcanic rocks in Taiwan Island is listed in this paper, which clarifies the data of volcanicactivity. This volcanicactivity is closely related with plate movement since Mesozoic. Now there are still manifestations
of volcanic actions such as hot springs or fumaroles or solfataras.
The Transdanubian basaltic volcanicactivity presents several regularities that are exemined in this research. The areas of volcanism and the amount of basalts are examined. - (JS)
Geomorphological mapping with interest in the extent of glacial erosion giving, at the same time, a comprehensive treatment to a possible danger threatening Quito in case of a volcanic eruption of Pichincha. (MS).
Iceland is one of the youngest territory of the Earth's surface. Together with glaciers volcanicactivities contribute to another risk process called jökulhlaup. It is a large-scale flood event generated by a sudden drainage of the water contained
Physics and chemistry of arc magma| arc volcanism in time and space| geothermal and energetic aspects of arc volcanism| prediction, hazards and environmental aspects of volcanicactivities. Fifteen selected papers.
The present paper focuses on the relationships between Pliocene volcanicactivity and geomorphological evolution of Sinis region (western Sardinia, Italy). Plio-Pleistocene volcanicactivity plays a key role in the recent landscape evolution
. Morphological evolution has been reconstructed on the basis of chronological data obtained on different volcanic episodes. - (NF)
and spring-spilling type. Furthermore, the courses of development of volcanic landforms are divided into 3 stages according to the form and strength of volcanicactivities.
This paper divides the volcanic landforms into 4 grades according to formation, morphology, annd ingredient of matter. Lava cones are divided into 2 types based on the force of top-support and the fluid form of magma : the arc-projecting type
This research outlines the evolution of the Hargita and Görgényi Mountains, the southern part of the Eastern Carpathian Volcanic Chain. On the basis of arguments in the paper, the one-stage origin of the volcanicactivity is advanced. The style
and degree of degradation of the landforms after the volcanicactivity is also discussed. - (JS)
The AA. report how a pioneer liverwort, Nardia succulenta, stimulates accretion of volcanic ash, creating layers adhering to vertical bare cliffs and bridging fresh volcanic boulders, as well as creating habits that probably favour the liverworts
and facilitate occupation by vascular plants. The study site is on a foot slope of the 1968 cone of the volcano Arenal, an active strato-volcano in Costa Rica.
The relationship of large volcanic eruption in the world and the summer drought/flood in China
China ; Drought ; Flood ; Precipitation ; Sichuan ; Statistics ; Summer ; Temperature ; Volcanic eruption ; Weather type
Based on data in the last 500 years for strong volcanicactivity and the summer drought/flood types available in China, the statistical relations of the volcanic eruptions in seasons and several regions and the drought/flood types and grade index
of main regions in China have been investigated. The possible teleconnection between flood in the Yangtze River and the Haihe River valleys in 1991 and the volcanic eruption of Mt Pinatubo in June of 1991 has been also examined.
On 5 March 1987 two earth tremors caused topsoil and turf overturning, cracks in the ash mantle, and probably also cracks in soil profiles. In seismically active regions such episodic events may substantially influence soil profile development.
Based on observations, the A. concluded that the possible continuation of the volcanicactivity in the Carpathian-Pannonian region is not just a pure speculation, but is supported by scientific data. Thus, detailed, integrated researches
on the possible future volcanism are crucial. - (AM)
and volcanicactivity at a spreading centre, and the second phase involved a period of off-axis volcanic and tectonic activity.
Consideration of the structure and morphology of the study area as a whole, as well as that of a small constructional volcanic hill suggests that it evolved in two phases. The principal phase of development involved a period of crustal extension
KARAPINAR, EREGLI VE AKSARAY ARASINDA KALAN MINTAKADA UST-PLIOSEN-KUATERNER VOLKANIZMASI VOLCANICACTIVITY AMONG KARAPINAR, EREGLI AND AKSARAY DURING UPPER PLIOCENE-QUATERNARY
The AA. present the geological and volcanic setting of the Misti volcano which encompasses 2 edifices : the old Misti stratovolcano and the young Misti stratocone. They analyze the stratigraphy and the chronology of its eruptive activity
, in particular over the past 100,000 years : 7 compound groups of deposits record the late Pleistocene eruptive of the modern Misti stratocone. Then, they aim to assess the volcanic hazards of future eruptions at Misti, based on mapping, recent eruptive deposits
, and models used on similar stratovolcanoes : 700,000 people in the Arequipa-Chiguata region are threatened by at least 4 types of volcanic hazards.
Rapid deglaciation as an initiator of volcanicactivity: an hypothesis
L'activité volcanique sur l'île Marion ne s'est produite que pendant les interglaciaires. La répartition des volcans est associée à un système de failles radiales et périphériques qui serait le résultat de la déglaciation, la localisation des
failles étant due aux pressions différentielles entre surface englacées et surfaces non englacées pendant le relèvement isostatique. La région étant située dans un secteur actif, ces failles auraient entraîné la formation de volcans sur l'île.
Actividad volcánica ; Colada de lava ; Ecosistema ; Estudio de impacto ; Extremo Oriente ruso ; Kamcatka ; Rusia de Asia ; Vegetación ; Volcanismo ; Volcán
Etude de l’importance et des types d’impacts causés par l’activité volcanique sur la végétation de la zone proche du volcan Klioutchevskoï, l’un des plus importants de la Russie. L’A. montre que ces éruptions causent des dégâts sans précédent sur
l’écosystème d’une grande partie du territoire. Il analyse également les conséquences des impacts directs dûs à l’activité explosive et effusive du volcan.
this to the recession and downwasting of the LGM ice sheet. Their observations suggest that as the overlying ice sheet became thinner volcanicactivity became more explosive. For northern Iceland, their proposed sequence of landscape development suggests 2 major glacial
advances during the Holocene, at least one of which at Kverkfjöll probably coincided with volcanicactivity and a jökulhlaup.
The AA. describe and explain a regional topographic and geomorphic expression of sub-glacial volcanism, namely that at Kverkfjöll, Iceland. This area comprises a series of parallel sub-glacially-erupted volcanic edifices, which together give
excellent 3D geological exposure. These ridges are orientated north-south or along the most probable line of LGM ice margin retreat. The AA. combine topographic and geomorphic observations to explain the changing style of volcanism in space, and attribute