Results 51 to 60 of about 1,041,229 (154)
Revised Minoan eruption volume as benchmark for large volcanic eruptions
Nature Communications, 2023 Despite their global societal importance, the volumes of large-scale volcanic eruptions remain poorly constrained. Here, we integrate seismic reflection and P-wave tomography datasets with computed tomography-derived sedimentological analyses to estimate
Jens Karstens +14 more
doaj +1 more source
Peatlands, volcanoes and climate: Ecological and palaeoecological studies in Alaska and Scotland [PDF]
, 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
core +4 more sources
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
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 +6 more
doaj +1 more source
Journal of Quaternary Science, EarlyView.ABSTRACT Subfossil insect communities from the Quartz Creek site provide a detailed record of both Late Pleistocene steppe–tundra and Holocene boreal forest ecosystems in central Yukon Territory, Canada. Fifteen Pleistocene assemblages (marine isotope stages [MIS] 4 to 2) are dominated by steppe–tundra and dry‐tundra taxa, particularly the weevils ...
Scott L. Cocker +4 more
wiley +1 more source
A summary of terminology used in tephra-related studies [PDF]
, 2001 The word ‘tephra’, derived from a Greek word for ash, is a collective term for all the unconsolidated, primary pyroclastic products of a volcanic eruption.
Lowe, David J., Hunt, John B.
core
Stratigraphy and chronology of a 15ka sequence of multi-sourced silicic tephras in a montane peat bog, eastern North Island, New Zealand. [PDF]
, 1999 We document the stratigraphy, composition, and chronology of a succession of 16 distal, silicic tephra layers interbedded with lateglacial and Holocene peats and muds up to c. 15 000 radiocarbon years (c.
Lowe, David J. +5 more
core +1 more source
Ages on weathered Plio-Pleistocene tephra sequences, western North Island, New Zealand [PDF]
, 2001 Using the zircon fission-track method, we have obtained five ages on members of two strongly-weathered silicic, Pliocene-Pleistocene tephra sequences, the Kauroa and Hamilton Ash formations, in western North Island, New Zealand.
Liddell, Ivan J. +5 more
core
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
Managing and visualising geochemical data for tephra correlation with the IntChron Integration Tool
Journal of Quaternary Science, EarlyView.ABSTRACT There is now a wealth of glass‐shard geochemical data for volcanic ash (tephra) layers from a wide range of volcanoes and eruptions, providing invaluable datasets for tephrochronology. However, compilation of published data to assess tephra correlations leads to large files and requires careful management.
Victoria C. Smith +5 more
wiley +1 more source