Results 51 to 60 of about 9,073 (173)
Heavy solution methord for determination of volcanic glass content in tephras and tephra-derived soils [PDF]
Soil Science and Plant Nutrition, 1990 Abstract Volcanic glass is the most important primary mineral for the tephra-derived soils because it is the most abundant and the most weatherable among the primary minerals. The chemical properties of volcanic glass in tephras are closely related to the rock types of tephras (Kobayashi et al.
Sadao Shoji, Ichiro Yamada
openaire +2 more sources
Scientific Reports, 2018 It is a longstanding observation that the frequency of volcanism periodically changes at times of global climate change. The existence of causal links between volcanism and Earth’s climate remains highly controversial, partly because most related studies
J. Schindlbeck +6 more
semanticscholar +1 more source
A new method to identify the source vent location of tephra fall deposits: development and testing, and application to key Quaternary eruptions of Western North America [PDF]
arXiv, 2018 A new method to identify the source vent location of tephra fall deposits based on thickness or maximum clast size measurements is presented in this work. It couples a first-order gradient descent method with either one of two commonly-used semi-empirical models of tephra thickness distribution.
arxiv
Effects of tephra falls on vegetation: A Late‐Quaternary record from southern Italy
Journal of Ecology, 2018 Impacts of tephra deposition on vegetation are recorded in a series of 10 high temporal resolution absolute pollen diagrams from Lago Grande di Monticchio, each diagram spanning a single tephra deposition event during the last glacial–interglacial cycle.
J. R. Allen, B. Huntley
semanticscholar +1 more source
Shape recognition of volcanic ash by simple convolutional neural network [PDF]
arXiv, 2017 Shape analyses of tephra grains result in understanding eruption mechanism of volcanoes. However, we have to define and select parameter set such as convexity for the precise discrimination of tephra grains. Selection of the best parameter set for the recognition of tephra shapes is complicated.
arxiv
Kuwae, Epi and Tongoa Islands: Transformations of a volcanic landscape in central Vanuatu
Archaeology in Oceania, Volume 60, Issue 1, Page 42-62, April 2025.ABSTRACT This paper presents a detailed overview of archaeological research undertaken on Epi and Tongoa, in central Vanuatu. These islands were previously connected to one another and respectively formed the western and eastern portions of Kuwae, one of the largest islands in the Vanuatu archipelago, until the catastrophic Tombuk volcanic eruption ...
ROBERT HENDERSON +7 more
wiley +1 more source
Beyond eruptive scenarios: assessing tephra fallout hazard from Neapolitan volcanoes
Scientific Reports, 2016 Assessment of volcanic hazards is necessary for risk mitigation. Typically, hazard assessment is based on one or a few, subjectively chosen representative eruptive scenarios, which use a specific combination of eruptive sizes and intensities to represent
L. Sandri +6 more
semanticscholar +1 more source
The Depositional Record, Volume 11, Issue 2, Page 739-763, April 2025.. The Bebedero tectonic depression in San Luis province, Argentina, is a closed drainage basin that has formed as a result of block‐faulting and rifting processes. The Bebedero lake exhibits notable similarities to the endorheic watersheds of the western United States, particularly those of Death Valley, the Saline Valley and, to a lesser extent, the ...
Eimi Ailen Font +2 more
wiley +1 more source
Tephra hazard assessment at Mt. Etna (Italy) [PDF]
Natural Hazards and Earth System Sciences, 2013 Abstract. In this paper we present a probabilistic hazard assessment for tephra fallout at Mt. Etna (Italy) associated with both short- and long-lived eruptions. We analyzed wind data from the atmospheric soundings of the Italian Air Force at Trapani Birgi (western Sicily), and use the TEPHRA advection-diffusion-sedimentation model to capture the ...
S. Scollo +3 more
openaire +5 more sources
Reconstructing eruptive source parameters from tephra deposit: a numerical approach for medium-sized explosive eruptions [PDF]
arXiv, 2015 Since the seventies, several reconstruction techniques have been proposed, and are currently used, to extrapolate and quantify eruptive parameters from sampled deposit datasets. Discrete numbers of tephra ground loadings or stratigraphic records are usually processed to estimate source eruptive values. Reconstruction techniques like Pyle, Power law and
arxiv