Document
type: Class

Journal of Volcanology and Geothermal Research
type: Continuant
type: Thing
type: Generically Dependent Continuant
type: Information Content Entity
type: Collection
type: Entity
type: Journal
type: Document
publication venue for: Decoding pyroclastic density current flow direction and shear conditions in the flow boundary zone via particle-fabric analysis
type: Periodical

Continuant
type: Class

Entity
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Generically Dependent Continuant
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RDF description of Decoding pyroclastic density current flow direction and shear conditions in the flow boundary zone via particle-fabric analysis - http://orbis.uaslp.mx/vivo/individual/scopus5555
rights: termsOfUse
date: 2026-08-28T02:54:05
publisher: vivo
type: Document

Article
type: Class

Decoding pyroclastic density current flow direction and shear conditions in the flow boundary zone via particle-fabric analysis
crisid: 5556
has funding vehicle: Higher Education Research Council, HERC
type: Entity
freetext keyword: Alignment; Decoding; Deposits; Extraction; Shearing; Topography; Concentrated flow; Debris avalanche deposits; Extracting information; Fabric development; Fabric orientation; Particle alignment; Pyroclastic density currents; Quantitative information; Shear flow; debris avalanche; emplacement; outcrop; pyroclastic deposit; turbulent flow; unsteady flow; volcanic eruption; volcano; volcanology; Cascade Range; Mount Saint Helens; United States; Washington [United States]
date time value: article date 5556
volume: 402
type: Information Content Entity
e iscopus: 2-s2.0-85087399692
type: Generically Dependent Continuant
type: Thing
type: Document
most specific type: Article
related by: authorship_34515
has funding vehicle: National Science Foundation, NSF: NSF EAR-1347385
artnum: 106978
most specific type: Document
estado: published
related by: authorship_34516
related by: authorship_34517
abstract: One of the greatest challenges in volcanology is extracting information from volcanic deposits that inform the conditions at the time of emplacement. Here we explore particle-shape fabric within samples from the column-collapse pyroclastic density current (PDC) deposits generated by the 18 May 1980 eruption of Mt. Saint Helens (MSH). Particle shape-fabric is the mutual alignment of particles within a sample, which is dependent on shearing conditions at the time of deposition. Here, particle shape-fabric is used to address the following hypotheses: (1) particle shape-fabric will align with bulk flow direction estimates made by previous studies, while resolving fine scale flow direction variations; (2) samples extracted from PDC deposits immediately above a basal contact will show higher extents of fabric development (i.e. clast alignment) relative to samples extracted well above the contact; and (3) samples extracted from cross-stratified deposits will have higher extents of fabric development relative to samples extracted from the massive facies. We find that fabric orientations approximate previous flow direction interpretations of general flow, from south to north, and channelization due to paleo-topography. Furthermore, shape-fabric records flow interaction with the substrate, created by debris avalanche deposits, leading to fine scale variations in flow paths. These variations are recorded in samples extracted near the substrate-deposit contact. Moreover, these samples do not show a higher measure of clast alignment relative to samples taken well above flow contacts but do exhibit bimodal clast alignment. This suggests some degree of traction transport and thus higher shearing conditions relative to when the currents deposited massive lapilli tuffs. Samples extracted from the cross-stratified deposits do not show higher extents of fabric development relative to the massive deposits, supporting previous interpretations that these deposits formed from a rapidly se…
doi: 10.1016/j.jvolgeores.2020.106978
type: Continuant
origen: scopus
related by: authorship_34513
type: Article
has publication venue: Journal of Volcanology and Geothermal Research
related by: authorship_34514

Information Content Entity
type: Class

Higher Education Research Council, HERC
type: Relationship
type: BFO_0000020
type: Entity
type: Thing
type: Grant
type: Continuant
funding vehicle for: Decoding pyroclastic density current flow direction and shear conditions in the flow boundary zone via particle-fabric analysis

National Science Foundation, NSF: NSF EAR-1347385
type: Relationship
type: BFO_0000020
type: Entity
type: Thing
type: Grant
type: Continuant
funding vehicle for: Decoding pyroclastic density current flow direction and shear conditions in the flow boundary zone via particle-fabric analysis