Results 1 to 10 of about 32,694 (262)

Preservation of thin tephra [PDF]

Journal of Applied Volcanology, 2017
The preservation of thin (
Russell Blong, Neal Enright, Paul Grasso
doaj   +3 more sources

Sources of uncertainty in the Mazama isopachs and the implications for interpreting distal tephra deposits from large magnitude eruptions

Bulletin of Volcanology, 2020
Estimating the area of tephra fallout and volume of large magnitude eruptions is fundamental to interpretations of the hazards posed by eruptions of this scale. This study uses the tephra from the caldera forming eruption of Mount Mazama (Crater Lake, OR,
Hannah M Buckland, Katharine Venable Cashman, Samantha Engwell   +2 more
exaly   +2 more sources

Predicting the presence of tephra layers in lacustrine deposits using spectral gamma ray data: An example from Lake Chalco, Mexico City. [PDF]

PLoS ONE
Spectral gamma ray borehole logging data can yield insights into the physical properties of lake sediments, serving as a valuable proxy for assessing climate and environmental changes.
Mehrdad Sardar Abadi, Christian Zeeden, Arne Ulfers, Alex Susan Meyer, Thomas Wonik, Mexidrill team   +5 more
doaj   +2 more sources

A review of late Quaternary silicic and some other tephra formations from New Zealand: Their stratigraphy, nomenclature, distribution, volume, and age [PDF]

New Zealand Journal of Geology, and Geophysics, 1990
The stratigraphic relationships and distribution of 36 named late Quaternary (≤c. 50 000 yr B P.) silicic tephra formations, erupted from 4 volcanic centres—Okataina, Taupo, Maroa, and Tuhua (Mayor Island)—are presented.
Froggatt, Paul C., Lowe, David J.
exaly   +3 more sources

Unique microbial communities in ancient volcanic ash layers within deep marine sediments are structured by the composition of iron phases [PDF]

Frontiers in Microbiology
Much of the marine sedimentary environment is affected by the deposition of tephra, the explosive products of volcanic eruptions. These tephra layers’ geochemical and physical properties often differ substantially from those of the surrounding sediment ...
Sönke Rolfes, Jack Longman, Jack Longman, Katharina Pahnke, Bert Engelen   +4 more
doaj   +2 more sources

The role of tephra in enhancing organic carbon preservation in marine sediments

Earth-Science Reviews, 2019
Preservation of organic carbon (Corg) in marine sediments plays a major role in defining ocean-atmosphere CO2 levels, Earth climate, and the generation of hydrocarbons.
Jack Longman, Martin R Palmer, Thomas Gernon   +2 more
exaly   +2 more sources

Tephra-mediated manganese cycling shapes coral responses to coastal sedimentation [PDF]

Scientific Reports
Terrestrial runoff from tropical volcanic islands impacts coral reefs by increasing turbidity and sedimentation. During explosive volcanic eruptions, large amounts of fragmented volcanogenic rock (tephra) are deposited, exacerbating sediment runoff for ...
Frank Förster, Christine Ferrier-Pagès, Allan Fries, Erouscilla Joseph, Tom E. Sheldrake   +4 more
doaj   +2 more sources

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

Bulletin 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, Streeter RT, Marple J, Shotter LR, Yeoh JS, Dugmore AJ   +5 more
openaire   +5 more sources

Rittmann volcano, Antarctica as the source of a widespread 1252 ± 2 CE tephra layer in Antarctica ice

Earth and Planetary Science Letters, 2019
Tephra occur in many ice cores from Antarctica and are important time markers that assist in correlations between cores and in dating their valuable climate records.
Philip Kyle, Nels A Iverson, Yeongcheol Han   +2 more
exaly   +2 more sources

First Report of Acanthamoeba Genotype T4 from the Newly Formed Tajogaite Volcano Tephra (La Palma, Canary Islands) [PDF]

Pathogens
The Tajogaite Volcano erupted on the western slope of the Cumbre Vieja mountain range on La Palma Island in the Canary Islands, Spain, in 2021. As one of the multiple consequences of this eruption, a layer of tephra was deposited, to a variable extent ...
Patricia Pérez-Pérez, María Reyes-Batlle, Rubén L. Rodríguez-Expósito, Adolfo Perdomo-González, Ines Sifaoui, Francisco J. Díaz-Peña, Rodrigo Morchón, Sutherland K. Maciver, José E. Piñero, Jacob Lorenzo-Morales   +9 more
doaj   +2 more sources