Results 21 to 30 of about 26,308 (272)

La Tephra de Bag: une retombée volcanique à large dispersion dans le loess pléistocène d'Europe centrale [PDF]

open access: yesEiszeitalter und Gegenwart, 1991
Mehrere Eigenschaften (Korngröße, Mineralspektrum, chemische Zusammensetzung von Gesamtproben und von Klinopyroxenen) einer Tephralage, die in sieben Lößprofilen von Ungarn und der Tschechoslovakei vorkommt, wurden untersucht. Die Tephra ist identisch in
E. Juvigné, E. Horváth, G. Gábris
doaj   +1 more source

Stratigraphy and chronology of the Stent tephra, a c. 4000 year old distal silicic tephra from Taupo Volcanic Centre, New Zealand. [PDF]

open access: yes, 1994
Tephrostratigraphic and chronologic studies in two areas of the North Island have identified a previously unrecorded, thin, distal silicic tephra derived from the Taupo Volcanic Centre.
Alloway, Brent V.   +4 more
core   +2 more sources

Eruptive history of Mt. Fuji over the past 8000 years based on integrated records of lacustrine and terrestrial tephra sequences and radiocarbon dating

open access: yesQuaternary Science Advances, 2023
Reliable records of past volcanic activities are essential for assessing future eruption probabilities and establishing effective volcanic disaster mitigation plans.
Shinya Yamamoto   +4 more
doaj   +1 more source

Distal occurrence of mid-Holocene Whakatane Tephra on the Chatham Islands, New Zealand, and potential for cryptotephra studies [PDF]

open access: yes, 2011
The Whakatane Tephra, a rhyolitic tephra erupted ca. 5500 cal. BP from Okataina Volcanic Centre, central North Island, has been identified on the Chatham Islands which lie ˜900 km east of Christchurch, New Zealand.
Hogg, Alan G.   +3 more
core   +2 more sources

The Contributions of Marine Sediment Cores to Volcanic Hazard Assessments: Present Examples and Future Perspectives

open access: yesGeosciences, 2023
The rigorous assessment of volcanic hazards relies on setting contemporary monitoring observations within an accurate, longer-term geological context. Revealing that geological context requires the detailed fieldwork, mapping and laboratory analysis of ...
Chris Satow   +4 more
doaj   +1 more source

Coastal dunes of Urup Island (Kuril Islands, North-Western Pacific): palaeoclimatic and environmental archive [PDF]

open access: yesГеосистемы переходных зон, 2022
The Late Holocene phases of aeolian processes have been reconstructed on the basis of dune fields construction. The palaeoenvironmental studies were targeted to following problems: 1) to determine the periods of higher and lower activity of aeolian ...
Nadezhda G. Razjigaeva   +3 more
doaj   +1 more source

Hiroshi Machida −respected tephrochronologist, teacher, leader [PDF]

open access: yes, 2011
Professor Emeritus Hiroshi Machida (Hiroshi hereafter) is the leading tephrochronologist of his generation in Japan. Perhaps more than any other geoscientist from Japan, Hiroshi carried the insights and advances of tephra studies and their application in
Lowe, David J.   +2 more
core   +2 more sources

Tephra transformations: variable preservation of tephra layers from two well-studied eruptions [PDF]

open access: yesBulletin of Volcanology, 2018
Volcanologists often use terrestrial tephra layers to reconstruct volcanic eruptions. However, the conversion of fresh tephra deposits into tephra layers is poorly understood. To address this knowledge gap, we surveyed tephra layers emplaced by the 1980 eruption of Mount St Helens, USA (MSH1980) and the 1947 eruption of Hekla, Iceland (H1947).
Cutler NA   +5 more
openaire   +4 more sources

Rapid Tephra Identification in Geological Archives With Computed Tomography: Experimental Results and Natural Applications

open access: yesFrontiers in Earth Science, 2021
Volcanic ash (tephra) horizons represent powerful chronological and stratigraphic markers: rapid and widespread deposition allows for correlation of geological records in time and space.
Willem G. M. van der Bilt   +8 more
doaj   +1 more source

Stratigraphy and chronology of a 15ka sequence of multi-sourced silicic tephras in a montane peat bog, eastern North Island, New Zealand. [PDF]

open access: yes, 1999
We document the stratigraphy, composition, and chronology of a succession of 16 distal, silicic tephra layers interbedded with lateglacial and Holocene peats and muds up to c. 15 000 radiocarbon years (c.
Lowe, David J.   +2 more
core   +2 more sources

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