Results 41 to 50 of about 1,652 (182)

Rapid Tephra Identification in Geological Archives With Computed Tomography: Experimental Results and Natural Applications

Frontiers in Earth Science, 2021
Volcanic ash (tephra) horizons represent powerful chronological and stratigraphic markers: rapid and widespread deposition allows for correlation of geological records in time and space.
Willem G. M. van der Bilt, Willem G. M. van der Bilt, Jan Magne Cederstrøm, Eivind W. N. Støren, Eivind W. N. Støren, Sarah M. P. Berben, Sarah M. P. Berben, Sunniva Rutledal, Sunniva Rutledal   +8 more
doaj   +1 more source

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source

Soils and soilscapes of the Upper Volturno basin: a detailed survey of a large intermontane basin in the Central-Southern Apennines, Italy

Journal of Maps, 2021
Soils of the Upper Volturno basin in the Central-Southern Apennines (Molise, Italy) were surveyed in detail. Trends in development are described with focus on the contrast between the mountain soils and the soils of the basin.
R. H. van Otterloo, J. Sevink
doaj   +1 more source

Probabilistic Source Classification of Large Tephra Producing Eruptions Using Supervised Machine Learning: An Example From the Alaska‐Aleutian Arc

Geochemistry, Geophysics, Geosystems, 2023
Alaska contains over 130 volcanoes and volcanic fields that have been active within the last 2 million years. Of these, roughly 90 have erupted during the Holocene, with many characterized by at least one large explosive eruption.
Jordan Lubbers, Matthew Loewen, Kristi Wallace, Michelle Coombs, Jason Addison   +4 more
doaj   +1 more source

Origin and significance of ice‐rafted detritus in the Atlantic sector of the Southern Ocean

Geochemistry, Geophysics, Geosystems, 2007
Piston core TN057‐14 from the eastern Atlantic sector of the Southern Ocean contains several layers rich in volcanic tephra that were deposited during the last glacial period.
Simon H. H. Nielsen, D. A. Hodell, G. Kamenov, T. Guilderson, M. R. Perfit   +4 more
doaj   +1 more source

Volcanic Ash Affected by Lightning During the Hunga 2022 Eruption

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract The 15 January 2022 eruption of Hunga volcano (Kingdom of Tonga) produced the most lightning ever documented during an explosive eruption to date. This study estimates the mass of erupted tephra that may be structurally or electromagnetically affected by the lightning, based upon lightning peak current, channel length, and ash plume particle ...
Kimberly Genareau, Joali Paredes‐Mariño, Shane J. Cronin, Sebastian S. Harkema, Christopher J. Schultz, Kelley M. Murphy, Aaron R. Naeger   +6 more
wiley   +1 more source

Volcanic Fluxes Over the Last Millennium as Recorded in the Gv7 Ice Core (Northern Victoria Land, Antarctica)

Geosciences, 2020
Major explosive volcanic eruptions may significantly alter the global atmosphere for about 2−3 years. During that period, volcanic products (mainly H2SO4) with high residence time, stored in the stratosphere or, for shorter times, in the ...
Raffaello Nardin, Alessandra Amore, Silvia Becagli, Laura Caiazzo, Massimo Frezzotti, Mirko Severi, Barbara Stenni, Rita Traversi   +7 more
doaj   +1 more source

New Zealand Geological Timescale 2025

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
New Zealand Geological Timescale 2025 (NZGT 2025) is the first comprehensive update and revision of the New Zealand Geological Timescale in a decade. The criteria used to establish age ranges of New Zealand Stages within the NZGT have been reviewed, calibrated, and revised where required against the 2023/04 International Chronostratigraphic Chart and ...
Christopher D. Clowes, James S. Crampton, Kyle J. Bland, J. Ian Raine, Andrew F. Boyes, Hamish J. Campbell, Erica M. Crouch, Martin P. Crundwell, Neville Hudson, Elizabeth M. Kennedy, Donald A. B. MacFarlan, Hugh E. G. Morgans, Marcus D. Richards, Matthew W. Sagar   +13 more
wiley   +1 more source

Initiation of the Ferrar Large Igneous Province Started in Southern North Victoria Land, Antarctica, With Shallow Emplacement of Sills Causing Magma‐Soft‐Rock Interaction and Phreatomagmatic Eruptions

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
Early Jurassic volcanism was in the southern north Victoria Land portion of the Ferrar Large Igneous Province preceded by multiple phases of shallow‐level intrusions of Ferrar sills into the 300 m thick cover of sedimentary rocks of the Triassic‐Jurassic Victoria Group.
Lothar G. Viereck, Jörg Büchner, Robert Schöner, Jörg W. Schneider, Benjamin Bomfleur, Jan Tympel, Ricarda Hanemann, Axel Gerdes   +7 more
wiley   +1 more source

Relation between Central European Climate Change and Eifel Volcanism during the Last 130,000 Years: The ELSA-23-Tephra-Stack

Quaternary
The analysis of tephra layers in maar lake sediments of the Eifel shows 14 well-visible tephra during the last glacial cycle from the Holocene to the Eemian (0–130,000 yr b2k).
Frank Sirocko, Frederik Krebsbach, Johannes Albert, Sarah Britzius, Fiona Schenk, Michael W. Förster   +5 more
doaj   +1 more source