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  Timing and nature of volcanic particle clusters based on field and numerical investigations.

Bagheri, G., Rossi, E., Biass, S., & Bonadonna, C. (2016). Timing and nature of volcanic particle clusters based on field and numerical investigations. Journal of Volcanology and Geothermal Research, 327, 520-530. doi:10.1016/j.jvolgeores.2016.09.009.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-4ACB-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-08C5-D
Genre: Journal Article

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 Creators:
Bagheri, Gholamhossein1, Author              
Rossi, E., Author
Biass, S., Author
Bonadonna, C., Author
Affiliations:
1Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063287              

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Free keywords: Aggregation; Volcanic aggregate; Particle cluster; Field investigation; Numerical; Sakurajima volcano
 Abstract: Aggregation processes are known to play an important role in volcanic particle dispersal and sedimentation. They are also a primary source of uncertainty in ash dispersal forecasting since fundamental questions, such as the timing and deposition dynamics of volcanic aggregates, still remain unanswered. Here, we applied a state-of-the-art combination of field and numerical strategies to characterize volcanic aggregates. We introduce a new category of aggregates observed with high-speed-high-resolution videos, namely cored clusters. Cored clusters are mostly sub-spherical fragile aggregates that have never been observed in the deposits nor on adhesive tape as they typically break at impact with the ground. They consist of a core particle (200-500 mu m) fully covered by a thick shell of particles < 90 mu m. The low preservation potential of cored clusters in ash deposits explains the poor documentation in the literature and the low consideration attributed so far. Cored clusters can also better explain the deposition of fine ash in proximal and medial regions and the polymodality observed in many ash deposits. In addition, numerical inversions show how cored clusters can rapidly form within 175s from eruption onset. Finally, our observations represent the first field-based evidence of the so-called rafting effect, in which the sedimentation of coarse ash in cored clusters is delayed due to aggregation

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Language(s): eng - English
 Dates: 2016-09-222016-11-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.jvolgeores.2016.09.009
 Degree: -

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Title: Journal of Volcanology and Geothermal Research
Source Genre: Journal
 Creator(s):
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Publ. Info: -
Pages: - Volume / Issue: 327 Sequence Number: - Start / End Page: 520 - 530 Identifier: -