气候变化领域集成服务门户(CCPortal): Post-2018 Caldera Collapse Re-Inflation Uniquely Constrains Kīlauea's Magmatic System

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DOI	10.1029/2021JB021803
	Post-2018 Caldera Collapse Re-Inflation Uniquely Constrains Kīlauea's Magmatic System
	Wang T.; Zheng Y.; Pulvirenti F.; Segall P.
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	From August 2018 to May 2019, Kīlauea’s summit exhibited unique, simultaneous, inflation and deflation, apparent in both GPS time series and cumulative InSAR displacement maps. This deformation pattern provides clear evidence that the Halema‘uma‘u (HMM) and South Caldera (SC) reservoirs are distinct. Post-collapse inflation of the East Rift Zone (ERZ), as captured by InSAR, indicates concurrent magma transfer from the summit reservoirs to the ERZ. We present a physics-based model that couples pressure-driven flow between these magma reservoirs to simulate time dependent summit deformation. We take a two-step approach to quantitatively constrain Kīlauea’s magmatic plumbing system. First, we jointly invert the InSAR displacement maps and GPS offsets for the location and geometry of the summit reservoirs, approximated as spheroidal chambers. We find that HMM reservoir has an aspect ratio of ∼1.8 (prolate) and a depth of ∼2.2 km (below surface). The SC reservoir has an aspect ratio of ∼0.14 (oblate) and a depth of ∼3.6 km. Second, we utilize the flux model to invert GPS time series from 8 summit stations. Results favor a shallow HMM-ERZ pathway an order of magnitude more hydraulically conductive than the deep SC-ERZ pathway. Further analysis shows that the HMM-ERZ pathway is required to explain the deformation time series. Given high-quality geodetic data, such an approach promises to quantify the connectivity of magmatic pathways between reservoirs in other similar volcanic systems. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Caldera collapse; Kīlauea; magma flux; physics based model; re-inflation; SBAS
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/187049
作者单位	Department of Geophysics, Stanford University, Standford, CA, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Nanjing University of Information Science and Technology, Nanjing, China
推荐引用方式 GB/T 7714	Wang T.,Zheng Y.,Pulvirenti F.,et al. Post-2018 Caldera Collapse Re-Inflation Uniquely Constrains Kīlauea's Magmatic System[J],2021,126(6).
APA	Wang T.,Zheng Y.,Pulvirenti F.,&Segall P..(2021).Post-2018 Caldera Collapse Re-Inflation Uniquely Constrains Kīlauea's Magmatic System.Journal of Geophysical Research: Solid Earth,126(6).
MLA	Wang T.,et al."Post-2018 Caldera Collapse Re-Inflation Uniquely Constrains Kīlauea's Magmatic System".Journal of Geophysical Research: Solid Earth 126.6(2021).