Hummock alignment in Japanese volcanic debris avalanches controlled by pre-avalanche slope of depositional area

Geomorphology ◽  
2014 ◽  
Vol 223 ◽  
pp. 67-80 ◽  
Author(s):  
Hidetsugu Yoshida
Keyword(s):  
Debris Avalanches ◽  
Volcanic Debris

Volcanic debris avalanches

2015 ◽  
pp. 139-164
Author(s):  
Benjamin van Wyk de Vries ◽  
Audray Delcamp
Keyword(s):  
Debris Avalanches ◽  
Volcanic Debris

Prehistoric debris avalanches from Mount Cayley volcano, British Columbia

1991 ◽  
Vol 28 (9) ◽  
pp. 1365-1374 ◽  
Author(s):  
S. G. Evans ◽  
G. R. Brooks
Keyword(s):  
British Columbia ◽  
Economic Development ◽  
Public Safety ◽  
Debris Avalanches ◽  
Western Flank ◽  
Historic Time ◽  
Volcanic Debris ◽  
Upper Slope

An investigation of diamicton units exposed in an extensive accumulation of volcanic debris in the Squamish valley, west of Mount Cayley volcano, has yielded evidence for at least three major debris avalanches, initiated by the collapse of the western flank of Mount Cayley in the mid-Holocene. Radiocarbon ages obtained from tree fragments contained in the deposits indicate that the events took place at 4800, 1100, and 500 BP. All three debris avalanches dammed the Squamish River and formed temporary lakes upstream of the debris. Failure of the cone took place after considerable dissection of the original edifice had exposed weak pyroclastic materials at the base of the steep upper slope of the volcano. No evidence of older debris avalanches from Mount Cayley has been discovered. Smaller scale debris avalanches probably have been common, and at least two have occurred in historic time (1963 and 1984). Debris avalanches from Mount Cayley and the effects of a possible damming of the Squamish River are major geomorphic hazards to public safety and economic development in the Squamish valley.

scholarly journals Longitudinal downsizing of hummocks by the freely-spreading volcanic debris avalanches in Japan

2010 ◽  
Vol 49 (2) ◽  
pp. 55-67 ◽  
Author(s):  
Hidetsugu Yoshida ◽  
Toshihiko Sugai ◽  
Hiroo Ohmori
Keyword(s):  
Debris Avalanches ◽  
Volcanic Debris

Emplacement and transformations of volcanic debris avalanches-A case study at El Misti volcano, Peru

2017 ◽  
Vol 340 ◽  
pp. 68-91 ◽  
Author(s):  
Karine Bernard ◽  
Jean-Claude Thouret ◽  
Benjamin van Wyk de Vries
Keyword(s):  
Debris Avalanches ◽  
Volcanic Debris

Volcanic Debris Avalanches

2015 ◽  
pp. 131-157 ◽  
Author(s):  
Benjamin van Wyk de Vries ◽  
Audray Delcamp
Keyword(s):  
Debris Avalanches ◽  
Volcanic Debris

The role of sedimentology in the mobility of debris avalanches: Evidence from their deposits and granular flow experiments

2021 ◽  
Author(s):  
Symeon Makris ◽  
Irene Manzella ◽  
Paul Cole ◽  
Matteo Roverato
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Granular Flows ◽  
High Water ◽  
Debris Avalanche ◽  
High Water Content ◽  
Sediment Size ◽  
Debris Avalanches ◽  
Volcanic Debris

<p>Debris avalanches and lahars are among the most destructive and hazardous mass flows in volcanic environments making them important to understand from a hazard assessment perspective. Sedimentological characteristics of their deposits are important for assessing their propagation and emplacement mechanisms. Here, we compare the sedimentology of nine volcanic debris avalanches and eight lahars, by the descriptive statistics: median grain size, sand, gravel and finer particle proportion, skewness, and sorting.</p><p>Results suggest that lahars and debris avalanches diverge in their grain size distribution evolution during propagation, even when sourced from the same material. Increasing bimodality, evolution to negative skewness, with decreasing sediment size, accompanied by very poor sorting suggest comminution of particles due to particle-particle interactions in debris avalanches. Instead, preferential deposition of the coarsest particles and improved sorting suggest that the decrease in grain size of lahars is the result of debulking. The divergence is mainly caused by the high water content in lahars, which introduce different processes during propagation. This suggests, in agreement with previous studies, that debris avalanches can be considered as dense granular flows where the effect of inertial collisions of solid fragments are more important than fluid effects.</p><p>Present findings and previous sedimentological studies suggest that both volcanic and non-volcanic debris avalanches exhibit bimodal grain-size distributions, at least locally, in areas of high shear accommodation. Following these results, an experimental campaign has been carried out to test the effect of bimodality on the propagation of granular flows. These experiments are flows of bidisperse granular material on an initial inclined plane, with a horizontal accumulation surface at the bottom.  Findings confirm that the bimodality of the grain size distribution generates a more efficient shearing arrangement, which can increase the mobility of granular flows in the same way recorded in debris avalanche deposits.</p>

Volcanic debris avalanches - from collapse to hazards

2020 ◽  
Author(s):  
Matteo Roverato ◽  
Anja Dufresne ◽  
Jon Procter
Keyword(s):  
Debris Avalanche ◽  
Future Research ◽  
Sector Collapse ◽  
Hazard Management ◽  
Volcano Collapse ◽  
Debris Avalanches ◽  
Destabilizing Factors ◽  
Volcanic Debris Avalanche ◽  
Volcanic Debris ◽  
Work Done

<p>This year marks the 40<sup>th</sup> anniversary of the 1980 Mt. St. Helens eruption and sector collapse. In acknowledgement to the vast research dedicated to understanding volcano collapse and debris avalanche dynamics, we have collated in a book the topic’s current state of the art. Within 12 chapters, this book contains reviews of and new insights from the work done over the past four decades, and provides outlooks and recommendations for future research. It is part of the Springer Book Series ‘Advances in Volcanology’ and the chapters contributed by a team of experts cover the following topics:</p><ol><li>Introduction </li> <li>A historical perspective on lateral collapse and debris avalanches</li> <li>Terminology and strategy to describe volcanic landslides and debris avalanches </li> <li>Distribution and geometric parameters of volcanic debris avalanche deposits </li> <li>Destabilizing factors that promote volcano flank collapse</li> <li>Volcanic debris avalanche transport kinematics and emplacement mechanisms</li> <li>Sedimentology of volcanic debris avalanche deposits</li> <li>Climatic and paleo-climatic implications </li> <li>Computer simulation of volcanic debris avalanches</li> <li>Volcanic debris avalanche deposits in the context of volcaniclastic ringplain successions</li> <li>Cyclicity in edifice destruction and regrowth </li> <li>Volcanic island lateral collapses and submarine volcanic debris avalanche deposits</li> </ol><p>Finally, the aim of the book is to reach the professional research community as well as students and a broader audience interested in hazard management in volcanic environments.</p>

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