Results 141 to 150 of about 9,073 (173)
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American Journal of Archaeology, 1974
I. The problem: According to studies on Mediterranean deep-sea cores by Ninkovich and Heezen,' tephra from two violent volcanic eruptions must have fallen on Crete in prehistoric times. The first of these eruptions occurred at least 25,000 years ago, and its tephra apparently fell on all parts of Crete.
Charles J. Vitaliano +1 more
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I. The problem: According to studies on Mediterranean deep-sea cores by Ninkovich and Heezen,' tephra from two violent volcanic eruptions must have fallen on Crete in prehistoric times. The first of these eruptions occurred at least 25,000 years ago, and its tephra apparently fell on all parts of Crete.
Charles J. Vitaliano +1 more
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Tephras and New Zealand Archaeology
Journal of Archaeological Science, 2000Establishing an accurate date for earliest Polynesian settlement in New Zealand is essential for understanding patterns of settlement and associated enviromental impacts, and the processes and rates of cultural change in Eastern Polynesia. Tephra deposits from five volcanic centres, together with exotic sea-rafted pumice, provide isochronous ...
Lowe, David J. +3 more
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A second tephra isochron for the Younger Dryas period in northern Europe: The Abernethy Tephra
Quaternary Geochronology, 2015Abstract Visible and non-visible (cryptotephra) volcanic ash layers are increasingly being used to underpin the chronology and high-precision correlation of sequences dating to the last glacial–interglacial transition (LGIT). As the number of sediment records analysed for tephra content rises, and methodological developments permit the detection ...
A. MacLeod +4 more
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1984
The transport modes of subaerial fallout tephra are (1) by ballistic trajectory and (2) by turbulent suspension. Energy is supplied initially to fragments by the eruption and later by wind. Tephra that falls from the atmosphere onto land is called subaerial fallout or airfall tephra.
Richard V. Fisher, Hans-Ulrich Schmincke
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The transport modes of subaerial fallout tephra are (1) by ballistic trajectory and (2) by turbulent suspension. Energy is supplied initially to fragments by the eruption and later by wind. Tephra that falls from the atmosphere onto land is called subaerial fallout or airfall tephra.
Richard V. Fisher, Hans-Ulrich Schmincke
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CLASSIFICATION OF TEPHRA-DERIVED SPODOSOLS
Soil Science, 1990There are many tephra-derived soils showing characteristic morphology and chemistry of Spodosols in humid cold climates. We reviewed ICOMOD (International Committee on the Classification of Spodosols) Proposal D by the National Soil Quality Survey Assurrance Staff (1989) using 43 tephra-derived soils from Alaska, the State of Washington, U.S.A., and ...
T. Ito, S. Shoji
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Nature, 1980
The large eruption of the Santorini (Thera) volcano, in ∼1500 BC, inspired Marinatos to attribute the decline of the Minoan civilization to this eruption1. It is still, however, being debated2,3 whether tsunamis were actually generated by the eruption of the volcano and whether the ash fall over eastern Crete was sufficient to cause its ...
L. Papazoglou, C. Doumas
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The large eruption of the Santorini (Thera) volcano, in ∼1500 BC, inspired Marinatos to attribute the decline of the Minoan civilization to this eruption1. It is still, however, being debated2,3 whether tsunamis were actually generated by the eruption of the volcano and whether the ash fall over eastern Crete was sufficient to cause its ...
L. Papazoglou, C. Doumas
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Identifying tephras by alpha counting
Canadian Journal of Earth Sciences, 1982Alpha counting, as used for determination of uranium and thorium concentrations, was found useful for identifying some tephras found in northwest North America. The method has the advantage of requiring only minimal sample preparation and the potential of providing a field technique for identifying tephras.
D. J. Huntley +2 more
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Fallout Tephra Simulation for Free [PDF]
Journal of Geography & Natural Disasters, 2013 It is here shown how PLUMERIA and TEPHRA2 can be combined to calculate a plausible map of an eventual volcanic eruption, without needing expensive clusters. Being TEPHRA2 a time consuming soft, it is expected that if reasonable correct input parameters are used since the start, only a few runs would have to be executed, possibly overnight, making it ...
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1981
A dark tephra layer, named “a”, is found in soils in East and Northeast Iceland. Its volume is approximately 2 km3 and it covers about 40% of Iceland. An isopach map and grain-size study suggests that the tephra deposit forms a distinctly two-lobed layer and was erupted in the year 1477 from the central volcano Kverkfjoll, at the northern margin of ...
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A dark tephra layer, named “a”, is found in soils in East and Northeast Iceland. Its volume is approximately 2 km3 and it covers about 40% of Iceland. An isopach map and grain-size study suggests that the tephra deposit forms a distinctly two-lobed layer and was erupted in the year 1477 from the central volcano Kverkfjoll, at the northern margin of ...
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Quaternary Science Reviews, 2019
Abstract Emerging lake sediment records are rapidly improving Iceland‘s Holocene tephra stratigraphy and chronology. Here, we expand upon these recent developments with a securely-dated tephrochronological record from the lake Haukadalsvatn in West Iceland.
David J. Harning +6 more
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Abstract Emerging lake sediment records are rapidly improving Iceland‘s Holocene tephra stratigraphy and chronology. Here, we expand upon these recent developments with a securely-dated tephrochronological record from the lake Haukadalsvatn in West Iceland.
David J. Harning +6 more
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