气候变化领域集成服务门户(CCPortal): Magma Oscillations in a Conduit-Reservoir System, Application to Very Long Period (VLP) Seismicity at Basaltic Volcanoes: 2. Data Inversion and Interpretation at Kīlauea Volcano

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DOI	10.1029/2019JB017456
	Magma Oscillations in a Conduit-Reservoir System, Application to Very Long Period (VLP) Seismicity at Basaltic Volcanoes: 2. Data Inversion and Interpretation at Kīlauea Volcano
	Liang C.; Crozier J.; Karlstrom L.; Dunham E.M.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	Very long period (VLP) seismic events (with dominant periods of 15 to 40 s), observed from 2007 to 2018 at the summit of Kīlauea Volcano, Hawai‘i, arise from resonant oscillations in the shallow magma plumbing system. Utilizing an oscillation model developed in the companion paper (Liang et al., 2020), we perform Bayesian inversions on seismic data from four representative VLP events separately for the parameters of the shallow conduit-reservoir system, exploring both sphere and crack reservoir geometries. Both sphere and crack geometries are preferentially located ∼1–2 km beneath the northeast edge of Halema‘uma‘u crater and produce similar fits to the data. Considering a reasonable range for reservoir storativity, magma density, and density contrast between the top and bottom of the conduit, we favor a spherical reservoir with a radius of 0.8 to 1.2 km and a short conduit of less than a few hundred meters. For this geometry, buoyancy from density stratification in the conduit provides the dominant restoring force for the VLP oscillation. Viscosity is constrained within an order of magnitude for each event (e.g., approximately 2 to 23 Pa s for one event versus 27 to 513 Pa s for another). Changes in VLP period T and quality factor Q can be explained by changes in viscosity, density stratification, and/or conduit/reservoir geometry. In particular, observed fluctuations in Q over short time intervals (e.g., hours) with minimal changes in T apparently require rapid changes of magma viscosity by over an order of magnitude, assuming geometry remains unchanged, possibly reflecting changes in volatile content, bubble concentration, or conduit flow regime. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Bayesian inversion; conduit-reservoir geometry; density stratification; Kīlauea Volcano; magma viscosity; very long period (VLP) oscillation
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/188055
作者单位	Department of Geophysics, Stanford University, Standford, CA, United States; Department of Earth Sciences, University of Oregon, Eugene, OR, United States; Institute for Computational and Mathematical Engineering, Stanford University, Standford, CA, United States
推荐引用方式 GB/T 7714	Liang C.,Crozier J.,Karlstrom L.,et al. Magma Oscillations in a Conduit-Reservoir System, Application to Very Long Period (VLP) Seismicity at Basaltic Volcanoes: 2. Data Inversion and Interpretation at Kīlauea Volcano[J],2020,125(1).
APA	Liang C.,Crozier J.,Karlstrom L.,&Dunham E.M..(2020).Magma Oscillations in a Conduit-Reservoir System, Application to Very Long Period (VLP) Seismicity at Basaltic Volcanoes: 2. Data Inversion and Interpretation at Kīlauea Volcano.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Liang C.,et al."Magma Oscillations in a Conduit-Reservoir System, Application to Very Long Period (VLP) Seismicity at Basaltic Volcanoes: 2. Data Inversion and Interpretation at Kīlauea Volcano".Journal of Geophysical Research: Solid Earth 125.1(2020).