Results 101 to 110 of about 1,217 (152)
Fall-units and Refractive Index Fluctuations of Eniwa-a Tephra Glass, Hokkaido, Japan
The Quaternary Research (Daiyonki-Kenkyu), 2003 恵庭aテフラ(En-a,17ka BP)の火山ガラス屈折率は,試料採取地点によって異なることがある.その原因は,En-aはフォールユニットごとに火山ガラス屈折率が異なるからである.石狩低地帯南部では,En-aに少なくとも3つのフォールユニットが認められる.火山ガラス屈折率は,上位フォールユニットで高い値(n=1.510-1.514),中～下位フォールユニットで低い値(n=1.505-1.510)を示す.また,単一のフォールユニット内であっても,火山ガラス屈折率は層準によって若干異なる.なお,斜方輝石屈折率については,最下位層準でやや高い値(γ=1.713-1.716)を示すほかは,全層準を通じてほぼ一定の値(γ=1.710-1.715)であった.これまで,火山学やテフロクロノロジーの分野では ...
Nakamura, Yugo, Hirakawa, Kazuomi
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Mechanism of Volcanic Tephra Falling Detected by X-Band Multi-Parameter Radar
Journal of Disaster Research, 2016 The present study shows the possibility of using X-band multi-parameter radar to detect volcanic tephra for estimating the amount of volcanic tephra in the air even when the amount of volcanic tephra is very low. The model proposed in this study can detect tephra with diameters of 0.5 mm to 3 mm.
Satoru Oishi +5 more
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Residential Buildings and Occupant Vulnerability to Tephra Fall
, 2005 Plinian and subplinian volcanic eruptions can be accompanied by tephra falls which may last hours or days, posing threats to people, buildings and economic activity. Numerous historical examples exist of tephra damage and tephra casualties.
ZUCCARO, GIULIO +4 more
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Latin American Journal of Sedimentology and Basin AnalysisThe 1991 explosive eruption of Hudson volcano in Chile ejected about 2.7 km³ (DRE) of basalt and trachyandesite magma as tephra fall. A majority of the fallout occurred from an eruption during the period August 12-15, 1991, producing an extensive deposit
Roberto A. Scasso, Steven Carey
doaj
Rare earth element geochemistry of the Late Quaternary tephra and volcano-clastic sediments from the Pachuca sub-basin, north-eastern Basin of Mexico [PDF]
Geofísica Internacional, 2010 Chondrite normalized REE patterns, fractionations of light (La/Sm), heavy (Gd/Yb) and total (La/Yb) REE and Eu anomalies of the Late Quaternary multi-layer tephra fall deposits and overlying volcano-clastic sediments deposited in the Pachuca sub-basin ...
R. Lozano +4 more
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, 2019 The 2011 eruption in the Puyehue-Cordón Caulle volcanic complex deposited up to 50 cm of tephra in a plume that intersected the crest of the Andes along Route 215, offering an excellent opportunity to study disturbance effects on native forests along a ...
Crisafulli,Charlie +4 more
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Characterizing Explosive Volcanic Eruptions Using Tephra Fall Deposit Data
, 2022 This dissertation addresses the estimation of the magnitudes and intensities of explosive volcanic eruptions using tephra fall deposits and numerical modeling. Tephra fall deposits retain information about eruption dynamics.
Constantinescu, Robert
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Peatlands, volcanoes and climate: Ecological and palaeoecological studies in Alaska and Scotland
, 2005 PhDThis thesis investigates direct and indirect volcanic impacts on peatlands using palaeoecological and ecological techniques. The primary approach used is palaeoecological studies across tephra layers. A multi-proxy methodology was adopted including
Payne, Richard John
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New constraints on the occurrence of Y-3 Upper Pleistocene tephra marker layer in the Tyrrhenian Sea
, 2004 : Munno R. & Petrosino P., New constraints on the occurrence of Y-3 Upper Pleistocene tephra layer in the Tyrrhenian Sea. (IT ISSN 0394 – 3356, 2004). A widespread tephra layer, other than the well known Y-5, has been identified in the Upper Pleistocene ...
Petrosino, Paola, Munno, Rosalba
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Tool Development for Studies on Tephra Fall Deposits and their Stratigraphic Characterization
, 2020 Ph.D.This thesis focuses on different aspects of studies on tephra fall deposits, and is composed of three projects. The first one investigates physical properties of tephra fall deposits preserved within the Wilson Creek Formation, eastern central ...
Yang, Qingyuan, 0000-0002-5631-889X
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