scholarly journals Theory for Deducing Volcanic Activity From Size Distributions in Plinian Pyroclastic Fall Deposits

2018 ◽  
Vol 123 (3) ◽  
pp. 2199-2213 ◽  
Author(s):  
Yu Iriyama ◽  
Atsushi Toramaru ◽  
Tetsuo Yamamoto
Keyword(s):  
Volcanic Activity ◽  
Size Distributions ◽  
Pyroclastic Fall Deposits ◽  
Pyroclastic Fall ◽  
Fall Deposits

Pyroclastic Fall Deposits

2015 ◽  
pp. 599-616 ◽  
Author(s):  
Bruce Houghton ◽  
Rebecca J. Carey
Keyword(s):  
Pyroclastic Fall Deposits ◽  
Pyroclastic Fall ◽  
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.

scholarly journals Quantitative redescription of the younger pyroclastic fall deposits ejected from Fuji Volcano

2020 ◽  
Vol 71 (6) ◽  
pp. 517-580
Author(s):  
Takahiro YAMAMOTO ◽  
Shun NAKANO ◽  
Yoshihiro ISHIZUKA ◽  
Akira TAKADA
Keyword(s):  
Pyroclastic Fall Deposits ◽  
Pyroclastic Fall ◽  
Fall Deposits

scholarly journals Seasonal and Event-Based Hydrological and Slope Stability Modeling of Pyroclastic Fall Deposits Covering Slopes in Campania (Southern Italy)

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1140 ◽  
Author(s):  
Pantaleone De Vita ◽  
Francesco Fusco ◽  
Rita Tufano ◽  
Delia Cusano
Keyword(s):  
Slope Stability ◽  
Southern Italy ◽  
Pressure Head ◽  
Slope Instability ◽  
Soil Pressure ◽  
Event Based ◽  
Pyroclastic Fall Deposits ◽  
Pyroclastic Fall ◽  
Stability Modeling ◽  
Fall Deposits

The pyroclastic fall deposits mantling mountain slopes in the Campania region (Southern Italy) represent one of the most studied geomorphological frameworks of the world regarding rainfall-induced debris flows threating urban areas. The proposed study focused on advancing knowledge about the hydrological response of pyroclastic fall coverings from the seasonal to event-based time scales, leading to the initiation of slope instability. The study was based on two consequential tasks. The first was the analysis of a six-year monitoring of soil pressure head carried out in a sample area of the Sarno Mountains, located above a debris flow initiation zone. The second was based on coupled hydrological and slope stability modeling performed on the physical models of slopes, which were reconstructed by empirical correlations between the slope angle, total thickness, and stratigraphic settings of pyroclastic fall deposits mantling slopes. The results obtained were: (a) The understanding of a soil pressure head regime of the volcaniclastic soil mantle, always ranging in unsaturated conditions and characterized by a strong seasonal variability depending on precipitation patterns and the life cycle of deciduous chestnut forest; and (b) the reconstruction through a deterministic approach of seasonal intensity–duration rainfall thresholds related to different morphological conditions.

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