气候变化领域集成服务门户(CCPortal): Reexamining the Potential to Classify Lava Flows From the Fractality of Their Margins

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DOI	10.1029/2020JB020949
	Reexamining the Potential to Classify Lava Flows From the Fractality of Their Margins
	Schaefer E.I.; Hamilton C.W.; Neish C.D.; Sori M.M.; Bramson A.M.; Beard S.P.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Can fractal analysis of a lava flow's margin enable classification of the lava's morphologic type (e.g., pāhoehoe)? Such classifications would provide insights into the rheology and dynamics of the flow when it was emplaced. The potential to classify lava flows from remotely-sensed data would particularly benefit the analysis of flows that are inaccessible, including flows on other planetary bodies. The technique's current interpretive framework depends on three assumptions: (1) measured margin fractality is scale-invariant; (2) morphologic types can be uniquely distinguished based on measured margin fractality; and (3) modification of margin fractality by topography, including substrate slope and confinement, would be minimal or independently recognizable. We critically evaluate these assumptions at meter scales (1–10 m) using 15 field-collected flow margin intervals from a wide variety of morphologic types in Hawaiʻi, Iceland, and Idaho. Among the 12 margin intervals that satisfy the current framework's suitability criteria (e.g., geomorphic freshness, shallowly-sloped substrates), we show that five exhibit notably scale-dependent fractality and all five from lava types other than ‘a‘ā or pāhoehoe would be classified as one or both of those types at some scales. Additionally, an ‘a‘ā flow on a 15° slope (Mauna Ulu, Hawaiʻi) and a spiny pāhoehoe flow confined by a stream bank (Holuhraun, Iceland) exhibit significantly depressed fractalities but lack diagnostic signatures for these modifications. We therefore conclude that all three assumptions of the current framework are invalid at meter scales and propose a new framework to leverage the potential of the underlying fractal technique while acknowledging these complexities. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Fractal; geometry; lava; morphology; planetary; scale-dependence
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187143
作者单位	Department of Earth Sciences, University of Western Ontario, London, ON, Canada; Institute for Earth and Space Exploration, University of Western Ontario, London, ON, Canada; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States; State Key Laboratory in Lunar and Planetary Science, Macau University of Science and Technology, Taipa, Macau
推荐引用方式 GB/T 7714	Schaefer E.I.,Hamilton C.W.,Neish C.D.,et al. Reexamining the Potential to Classify Lava Flows From the Fractality of Their Margins[J],2021,126(5).
APA	Schaefer E.I.,Hamilton C.W.,Neish C.D.,Sori M.M.,Bramson A.M.,&Beard S.P..(2021).Reexamining the Potential to Classify Lava Flows From the Fractality of Their Margins.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Schaefer E.I.,et al."Reexamining the Potential to Classify Lava Flows From the Fractality of Their Margins".Journal of Geophysical Research: Solid Earth 126.5(2021).