Pre-1980 tephra-fall deposits erupted from Mount St. Helens, Washington

1996 ◽  
Author(s):  
Donal R. Mullineaux
Keyword(s):  
Tephra Fall ◽  
Mount St Helens ◽  
Fall Deposits

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.

Distribution and mass of tephra-fall deposits from volcanic eruptions of Sakurajima Volcano based on posteruption surveys

2018 ◽  
Vol 80 (4) ◽  
Author(s):  
Masayuki Oishi ◽  
Kuniaki Nishiki ◽  
Nobuo Geshi ◽  
Ryuta Furukawa ◽  
Yoshihiro Ishizuka ◽  
...  
Keyword(s):  
Volcanic Eruptions ◽  
Tephra Fall ◽  
Sakurajima Volcano ◽  
Fall Deposits

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

scholarly journals Inclusion of ash and SO<sub>2</sub> emissions from volcanic eruptions in WRF-Chem: development and some applications

2013 ◽  
Vol 6 (2) ◽  
pp. 457-468 ◽  
Author(s):  
M. Stuefer ◽  
S. R. Freitas ◽  
G. Grell ◽  
P. Webley ◽  
S. Peckham ◽  
...  
Keyword(s):  
Transport Model ◽  
Three Dimensional ◽  
Wrf Model ◽  
Volcanic Eruptions ◽  
Weather Research And Forecasting ◽  
Tephra Fall ◽  
Additional Information ◽  
Volcanic Emission ◽  
Good Coincidence ◽  
Fall Deposits

Abstract. We describe a new functionality within the Weather Research and Forecasting (WRF) model with coupled Chemistry (WRF-Chem) that allows simulating emission, transport, dispersion, transformation and sedimentation of pollutants released during volcanic activities. Emissions from both an explosive eruption case and a relatively calm degassing situation are considered using the most recent volcanic emission databases. A preprocessor tool provides emission fields and additional information needed to establish the initial three-dimensional cloud umbrella/vertical distribution within the transport model grid, as well as the timing and duration of an eruption. From this source condition, the transport, dispersion and sedimentation of the ash cloud can be realistically simulated by WRF-Chem using its own dynamics and physical parameterization as well as data assimilation. Examples of model applications include a comparison of tephra fall deposits from the 1989 eruption of Mount Redoubt (Alaska) and the dispersion of ash from the 2010 Eyjafjallajökull eruption in Iceland. Both model applications show good coincidence between WRF-Chem and observations.

Late Quaternary distal tephra-fall deposits in lacustrine sediments, Kenai Peninsula, Alaska

2007 ◽  
Vol 68 (1) ◽  
pp. 64-78 ◽  
Author(s):  
Christian S. de Fontaine ◽  
Darrell S. Kaufman ◽  
R. Scott Anderson ◽  
Al Werner ◽  
Christopher F. Waythomas ◽  
...  
Keyword(s):  
Late Quaternary ◽  
Sediment Cores ◽  
Lacustrine Sediments ◽  
Ice Cores ◽  
Peak Period ◽  
Kenai Peninsula ◽  
Tephra Fall ◽  
Ash Fall ◽  
Tephra Layers ◽  
Fall Deposits

AbstractTephra-fall deposits from Cook Inlet volcanoes were detected in sediment cores from Tustumena and Paradox Lakes, Kenai Peninsula, Alaska, using magnetic susceptibility and petrography. The ages of tephra layers were estimated using 21 14C ages on macrofossils. Tephras layers are typically fine, gray ash, 1–5 mm thick, and composed of varying proportions of glass shards, pumice, and glass-coated phenocrysts. Of the two lakes, Paradox Lake contained a higher frequency of tephra (0.8 tephra/100 yr; 109 over the 13,200-yr record). The unusually large number of tephra in this lake relative to others previously studied in the area is attributed to the lake's physiography, sedimentology, and limnology. The frequency of ash fall was not constant through the Holocene. In Paradox Lake, tephra layers are absent between ca. 800–2200, 3800–4800, and 9000–10,300 cal yr BP, despite continuously layered lacustrine sediment. In contrast, between 5000 and 9000 cal yr BP, an average of 1.7 tephra layers are present per 100 yr. The peak period of tephra fall (7000–9000 cal yr BP; 2.6 tephra/100 yr) in Paradox Lake is consistent with the increase in volcanism between 7000 and 9000 yr ago recorded in the Greenland ice cores.

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