Results 71 to 80 of about 9,073 (173)
, 2017 Provenance studies of widely distributed tephras, integrated within a well‐defined temporal framework, are important to deduce systematic changes in the source, scale, distribution, and changes in regional explosive volcanism. Here, we establish a robust
S. Kutterolf +6 more
semanticscholar +1 more source
A model to assess tephra clean-up requirements in urban environments
Journal of Applied Volcanology, 2017 Tephra falls can cause a range of impacts to communities by disrupting, contaminating and damaging buildings and infrastructure systems, as well as posing a potential health hazard. Coordinated clean-up operations minimise the impacts of tephra on social
Josh L. Hayes +4 more
semanticscholar +1 more source
Experiments on the taphonomy of tephra in peat [PDF]
, 2005 Understanding the taphonomy of tephra (volcanic ash) is crucial to the use of tephrochronology in peatlands. This study uses field experiments on a Scottish peatland to investigate the post-depositional movement of tephra in peat. Experiments were designed to investigate the temporal change in tephra profiles over a 24-month study period, the ...
Payne, R. J. +3 more
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Efficient inversion and uncertainty quantification of a tephra fallout model
, 2017 An efficient and effective inversion and uncertainty quantification approach is proposed for estimating eruption parameters given a data set collected from a tephra deposit. The approach is model independent and here is applied using Tephra2, a code that
J. White +3 more
semanticscholar +1 more source
Tephra Sequence with Mica Flakes
Annals of The Tohoku Geographycal Asocciation, 1970 In the northern half of Kitakami Mountains, some tephra sequences composed of micaceous clayey volcanic ashes and pumice layers without mica flakes are observed. These sections are situated at hill foots and presented within exposed regions of granitic rocks.Pumice grains fell and settled relatively in short time and, on the contrary, falling and ...
Kei Sugawara, Osamu Miura
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, 2017 We describe the stratigraphy, age and correlation of a prominent tephra marker, named Lepué Tephra, extensively distributed in north‐western Patagonia. Lepué Tephra is well dated at c.
B. Alloway +8 more
semanticscholar +1 more source
Weighted model calibration with spatial conditional information [PDF]
arXivCost functions such as mean square error are often used in environmental model calibration. These treat observations as independent and equally important even though model residuals exhibit spatial dependence and additional observations near existing points do not provide as much information on the system as those elsewhere.
arxiv
, 1982 Published as part of James H. Honacki, Kenneth E. Kinman & James W. Koeppl, 1982, Order Insectivora, pp. 58-106 in Mammal Species of the World (1 st Edition), Lawrence, Kansas, USA :Alien Press, Inc.
James H. Honacki +2 more
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The Omachi Tephra Formations and Tephrochronology
The Quaternary Research (Daiyonki-Kenkyu), 1972 The tephras supplied from Late Quaternary volcanoes in Central Japan have been distinguished into some tephra regions. In this paper, the author has made the characterization, classification and tephrochronologic consideration of the Omachi Tephra formations, which are developed in the Omachi Tephra region.
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Widely dispersed Quaternary tephra in Africa
Global and Planetary Change, 1999 Abstract Several prominent widespread Pleistocene tephra layers have been recognised and correlated across northern Kenya, Ethiopia and Uganda. A single unit has been correlated between Lake Turkana and the Gulf of Aden. Each of these tephra units represents the products of an eruption of at least 4 km3 of magma. The number of active volcanoes within
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