Results 41 to 50 of about 1,217 (152)

Tephra studies in New Zealand: an historical review.

, 1990
The development of tephra studies in New Zealand may be divided into four main periods: Period 1, late 19th century to late 1920s; Period 2, late 1920s to early 1950s; Period 3, early 1950s to 1973; Period 4, 1973 to late 1980s.
Lowe, David J., David J. Lowe
core   +1 more source

Late Holocene palynology and palaeovegetation of tephra-bearing mires at Papamoa and Waihi Beach, western Bay of Plenty, North Island, New Zealand.

, 1995
The vegetation history of two mires associated with Holocene dunes near the western Bay of Plenty coast, North Island, New Zealand, is deduced from pollen analysis of two cores.
Wigley, G.N.A., G. N. A. Wigley, D. J. Lowe, Lowe, David J., R. M. Newnham, Newnham, Rewi M.   +5 more
core   +1 more source

Reconstruction of the 29th December 2013 Eruption of San Miguel Volcano, El Salvador, using Video, Photographs and Pyroclastic Deposits

Volcanica, 2022
San Miguel (or Chaparrastique) volcano, El Salvador, erupted on the 29th December 2013, after almost 40 years of quiescence. Initial vent-clearing explosions ejected ballistic blocks and produced a pyroclastic density current (PDC) that flowed down the ...
Richard James Brown, Walter Hernández, Demetrio Escobar, Eduardo Gutierrez, Julia Crummy, Rosemary Cole, Pierre-Yves Tournigand   +6 more
doaj   +1 more source

The thickness, volume and grainsize of tephra fall deposits

Bulletin of Volcanology, 1989
An improved empirical method for the plotting of field data and the calculation of tephra fall volumes is presented. The widely used “area” plots of ln(thickness) against ln(isopach area) are curved, implying an exponential thinning law. Use of ln(thickness)−(area)1/2 diagrams confirm the exponential dependence of many parameters (e.g.
openaire   +2 more sources

Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA

Volcanica, 2021
Eruptive dynamics of the 1060 CE rhyolitic eruption of Big Glass Mountain (BGM), USA, are investigated with field observations, hydrogen isotope and H2O content analysis of pyroclastic obsidian chips and lavas.
Jonathan Castro, Sebastian C. Walter
doaj   +1 more source

A cryptotephra from the Upper Pleistocene volcanism of the Bas-Vivarais in the sedimentary infilling of the Chauvet-Pont d’Arc cave (Ardèche, France)

Comptes Rendus. Géoscience, 2021
A cryptotephra belonging to the Upper Pleistocene volcanism of the Bas-Vivarais was identified for the first time in the sedimentary infilling of the entrance area of the Chauvet-Pont d’Arc cave. This slightly reworked tephra fall is characterized by its
Pastre, Jean-François, Debard, Évelyne, Ferrier, Catherine, Fialin, Michel, Gély, Bernard, Kervazo, Bertrand, Maksud, Frédéric, Mokadem, Fatima, Nomade, Sébastien, Rividi, Nicolas, Saulnier-Copard, Ségolène   +10 more
doaj   +1 more source

A new, ~4500‐year varve record and high‐resolution tephrochronology from lake Hämälänlampi, eastern Finland, provides age constraints for the Furnas C and the Glen Garry/Askja A‐2000 eruptions

Journal of Quaternary Science, EarlyView.
ABSTRACT The northern European distal cryptotephra framework is constantly developing both in terms of identification of new tephra horizons and improved age constraints for the already well‐established tephra marker horizons. However, many prehistoric tephra layers have only been dated by the radiocarbon method, with its inherent problems.
Maarit Kalliokoski, Veera Erola, Saija Saarni   +2 more
wiley   +1 more source

Marine tephrochronology: a personal perspective

, 2014
This special volume on marine tephrochronology is remarkable, and timely, because it marks a concerted step towards what might be informally termed ‘phase 3’ of a revolution in Quaternary geosciences that began around 40 years ago.
Lowe, David J., David J. Lowe
core   +1 more source

Farming in the shadows of Rome: A multi‐proxy palaeoenvironmental record from Loch Clunie—Perthshire

Journal of Quaternary Science, EarlyView.
ABSTRACT Roman impacts on local society is a subject of international significance. Loch Clunie, Perthshire, lies only 5.4 km from Inchtuthil, the only Roman legionary fortress in Scotland, and contains two crannogs and a probable lakeside hillfort. Despite this proximity and the likelihood of local–Roman interaction, these sites remain unexcavated ...
Samantha E. Jones, Maarten Blaauw, Fraser Hunter, Olalla López‐Costas, Antonio Martínez Cortizas, Tim M. Mighall, Gordon Noble   +6 more
wiley   +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