scholarly journals Reconstruction of eruption column dynamics on the basis of grain size of tephra fall deposits: 1. Methods

2001 ◽  
Vol 106 (B4) ◽  
pp. 6499-6512 ◽  
Author(s):  
Takehiro Koyaguchi ◽  
Marekazu Ohno
Keyword(s):  
Grain Size ◽  
Eruption Column ◽  
Tephra Fall ◽  
Column Dynamics ◽  
Fall Deposits

The 1973 Heimaey Strombolian Scoria deposit, Iceland

1974 ◽  
Vol 111 (6) ◽  
pp. 539-548 ◽  
Author(s):  
S. Self ◽  
R. S. J. Sparks ◽  
B. Booth ◽  
G. P. L. Walker
Keyword(s):  
Grain Size ◽  
Wind Speed ◽  
Eruption Column ◽  
Muzzle Velocity ◽  
Principal Factors ◽  
Pyroclastic Fall Deposits ◽  
Pyroclastic Fall ◽  
Fall Deposits

SummaryThe 1973 eruption on Heimaey, Iceland, presented the opportunity to study the interaction of the principal factors that control the formation of pyroclastic fall deposits. The grain size characteristics and the dispersal of some of the scoria fall units within the Eldfell Scoria deposit are described and related to observations made on the wind speed and direction, the height of the eruption column, the ‘muzzle’ velocity and the various styles of activity during the first month of the eruption.

Sedimentation of tephra by volcanic plumes. Part 2: controls on thickness and grain-size variations of tephra fall deposits

1992 ◽  
Vol 54 (8) ◽  
pp. 685-695 ◽  
Author(s):  
R S J Sparks ◽  
M I Bursik ◽  
G J Ablay ◽  
R M E Thomas ◽  
S N Carey
Keyword(s):  
Grain Size ◽  
Tephra Fall ◽  
Volcanic Plumes ◽  
Fall Deposits

The volcanological significance of deep-sea ash layers associated with ignimbrites

1980 ◽  
Vol 117 (5) ◽  
pp. 425-436 ◽  
Author(s):  
R. S. J. Sparks ◽  
T. C. Huang
Keyword(s):  
Deep Sea ◽  
Eastern Mediterranean ◽  
Eruption Column ◽  
Size Distributions ◽  
Ash Fall ◽  
Column Collapse ◽  
Median Diameter ◽  
Grain Size Distributions ◽  
Bimodal Grain Size ◽  
Fall Deposits

SummaryMany volcanic ash layers preserved in deep-sea sediments are the products of large magnitude ignimbrite eruptions. The characteristics of such co-ignimbrite ash-fall deposits are illustrated by two layers from the Eastern Mediterranean: the Minoan ash, Santorini, and the Campanian ash, Italy. These layers are divisible into a coarse lower unit and a fine upper unit in proximal cores. Both layers also show striking bimodal grain size distributions in more distal cores. The coarser mode decreases in median diameter with distance from source whereas the finer mode shows no lateral variation. These features are interpreted in terms of a model for ignimbrite formation by eruption column collapse. Comparable volumes of ignimbrite and associated air-fall ejecta are produced.

Simulations of Tephra Fall Deposits From a Bending Eruption Plume and the Optimum Model for Particle Release

2020 ◽  
Vol 125 (6) ◽  
Author(s):  
Kazutaka Mannen ◽  
Toshiaki Hasenaka ◽  
Atsushi Higuchi ◽  
Koji Kiyosugi ◽  
Yasuo Miyabuchi
Keyword(s):  
Tephra Fall ◽  
Particle Release ◽  
Optimum Model ◽  
Eruption Plume ◽  
Fall Deposits

Tephra-fall deposits in the Sleat Group (Torridonian), Isle of Skye, Scotland

2005 ◽  
Vol 142 (2) ◽  
pp. 209-215 ◽  
Author(s):  
R. A. BATCHELOR
Keyword(s):  
Marine Environment ◽  
Tephra Fall ◽  
Shallow Marine ◽  
Shallow Marine Environment ◽  
First Time ◽  
Isle Of Skye ◽  
Southern Highland ◽  
Fall Deposits

Tephra-fall deposits in the Late Mesoproterozoic Sleat Group (Torridonian) from Skye, Scotland, are described for the first time. Two individual beds occur within the Loch na Dal Formation which represents sedimentation in a shallow marine environment. Each bed has a distinctive brown, crumbly, amorphous appearance in the field and has sharp contacts with its host metasediment. This unique lithology is identical to that of albitic schists described recently from the Southern Highland Group, Dalradian Supergroup, which were identified as air-fall tuffs.

scholarly journals Effects of the crater on eruption column dynamics

2010 ◽  
Vol 115 (B7) ◽  
Author(s):  
Takehiro Koyaguchi ◽  
Yujiro J. Suzuki ◽  
Tomofumi Kozono
Keyword(s):  
Eruption Column ◽  
Column Dynamics
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