气候变化领域集成服务门户(CCPortal): Three-Dimensional Mapping of Mt. Ruapehu Volcano, New Zealand, From Aeromagnetic Data Inversion and Hyperspectral Imaging

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DOI	10.1029/2019JB018247
	Three-Dimensional Mapping of Mt. Ruapehu Volcano, New Zealand, From Aeromagnetic Data Inversion and Hyperspectral Imaging
	Miller C.A.; Schaefer L.N.; Kereszturi G.; Fournier D.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	Combining 3-D inversion of high-resolution aeromagnetic data with airborne hyperspectral imaging creates a new method to map buried structure and hydrothermal alteration, applied to Mt. Ruapehu volcano, New Zealand. Hyperspectral imaging is sensitive to surface mineralogy including alteration minerals, while magnetic vector inversion reveals the volumetric distribution of magnetic susceptibility from which we interpret buried geology. Probability assessment from multiple model regularizations provides an important model uncertainty estimate. At Ruapehu, hyperspectral imaging highlights two main regions of surface alteration: the Pinnacle Ridge and the southeast flanks. The magnetic model of Pinnacle Ridge shows that alteration seen at surface continues to depth, but strongly magnetic, unaltered dikes form the core of the ridge. On the southeast flanks, the magnetic model also shows alteration imaged on the surface continues to depth; however, a previously unknown, magnetized sill intrudes part of the flank. Several smaller demagnetized regions are modeled, unlike at neighboring Mt. Tongariro where the hydrothermal system created a large demagnetized core. We propose that these differences relate to spatially focused (Ruapehu) vs distributed (Tongariro) eruption vents, the degree of faulting of the edifice and its glaciation history. Lava-ice interaction produces fine-grained lavas with measured magnetic susceptibilities similar to some moderately altered lavas, illustrating that care must be taken in the interpretation of magnetic data in the absence of geological information. The combination of hyperspectral imaging and aeromagnetic data inversion distinguishes shallow surface weathering from deeper-seated hydrothermally altered rock masses, with implications for the magnitude and probability of collapse events. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	alteration; hydrothermal system; hyperspectral imaging; magnetic data inversion; slope stability; volcano structure
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/187975
作者单位	GNS Science, Wairakei Research Center, Taupo, New Zealand; Geological Sciences, University of Canterbury, Christchurch, New Zealand; Volcanic Risk Solutions, Massey University, Palmerston North, New Zealand; UBC-Geophysical Inversion Facility, Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
推荐引用方式 GB/T 7714	Miller C.A.,Schaefer L.N.,Kereszturi G.,et al. Three-Dimensional Mapping of Mt. Ruapehu Volcano, New Zealand, From Aeromagnetic Data Inversion and Hyperspectral Imaging[J],2020,125(2).
APA	Miller C.A.,Schaefer L.N.,Kereszturi G.,&Fournier D..(2020).Three-Dimensional Mapping of Mt. Ruapehu Volcano, New Zealand, From Aeromagnetic Data Inversion and Hyperspectral Imaging.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Miller C.A.,et al."Three-Dimensional Mapping of Mt. Ruapehu Volcano, New Zealand, From Aeromagnetic Data Inversion and Hyperspectral Imaging".Journal of Geophysical Research: Solid Earth 125.2(2020).