Results 31 to 40 of about 51,586 (326)

Generation of volcanic ash by basaltic volcanism [PDF]

open access: yesJournal of Geophysical Research: Solid Earth, 2012
The recent eruptions of Eyjafjallajökull and Grimsvötn volcanoes in Iceland demonstrate the importance of a better understanding of processes leading to the formation of volcanic ash, specifically of fine volcanic ash that poses a threat to air traffic.
Bernd Zimanowski   +4 more
openaire   +2 more sources

Modeling Wavelength Dependent Mid‐Infrared (5.5–25 μm) Optical Constants of Silicate Glasses: A Genetic Algorithm Approach

open access: yesEarth and Space Science, 2023
Wavelength‐dependent mid‐infrared (400–1,800 cm−1; 5.56–25 μm) optical constants (real and imaginary indices of refraction; n and k) are determined using reflectance spectra at a spectral sampling of 4 cm−1 for several silicate glasses of varying SiO2 wt%
I. Varatharajan   +3 more
doaj   +1 more source

Volcanostratigraphic Sequences of Kebo-Butak Formation at Bayat Geological Field Complex, Central Java Province and Yogyakarta Special Province, Indonesia

open access: yesIndonesian Journal on Geoscience, 2016
DOI:10.17014/ijog.3.2.77-94Bayat Complex is usually used as a work field for students of geology and other geosciences. The study area is located in the southern part of the Bayat Complex.
Sri Mulyaningsih
doaj   +1 more source

An Effusive Lunar Dome Near Fracastorius Crater: Spectral and Morphometric Properties

open access: yesRemote Sensing, 2022
We examine a dome within the boundary between Fracastorius crater and Mare Nectaris. The dome has a noticeable vent structure and appears to be perpendicular to wrinkle ridges in the southern Mare Nectaris basin.
Caitlin Ahrens, Raffaello Lena
doaj   +1 more source

Medieval Irish chronicles reveal persistent volcanic forcing of severe winter cold events, 431–1649 CE

open access: yesEnvironmental Research Letters, 2013
Explosive volcanism resulting in stratospheric injection of sulfate aerosol is a major driver of regional to global climatic variability on interannual and longer timescales. However, much of our knowledge of the climatic impact of volcanism derives from
Francis Ludlow   +9 more
doaj   +1 more source

Impacts of Volcanic Emissions on the Global Biogeochemical Mercury Cycle: Insights From Satellite Observations and Chemical Transport Modeling

open access: yesGeophysical Research Letters, 2023
Volcanism is the largest natural source of mercury (Hg) to the biosphere. However, past Hg emission estimates have varied by three orders of magnitude. Here, we present an updated central estimate and interquartile range (232 Mg a−1; IQR: 170–336 Mg a−1)
Benjamin M. Geyman   +3 more
doaj   +1 more source

Explosive volcanism as a key driver of the late Paleozoic ice age

open access: yesGeology, 2019
Atmospheric CO2 exerts a robust and well-documented control on Earth’s climate, but the timing of glaciation during the late Paleozoic Ice Age (LPIA; ca. 360–260 Ma) is inconsistent with pCO2 reconstructions, hinting at another factor.
G. Soreghan, M. Soreghan, N. Heavens
semanticscholar   +1 more source

Thallium isotopes reveal protracted anoxia during the Toarcian (Early Jurassic) associated with volcanism, carbon burial, and mass extinction

open access: yesProceedings of the National Academy of Sciences of the United States of America, 2018
Significance Declining oxygen contents in today’s oceans highlight the need to better understand ancient, natural marine deoxygenation and associated extinctions.
T. Them   +9 more
semanticscholar   +1 more source

An Integrated Geologic Map of the Rembrandt Basin, on Mercury, as a Starting Point for Stratigraphic Analysis

open access: yesRemote Sensing, 2020
Planetary geologic maps are usually carried out following a morpho-stratigraphic approach where morphology is the dominant character guiding the remote sensing image interpretation.
Andrea Semenzato   +7 more
doaj   +1 more source

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