气候变化领域集成服务门户(CCPortal): Modeling the Posteruptive Deformation at Okmok Based on the GPS and InSAR Time Series: Changes in the Shallow Magma Storage System

CCPortal

DOI	10.1029/2019JB017801
	Modeling the Posteruptive Deformation at Okmok Based on the GPS and InSAR Time Series: Changes in the Shallow Magma Storage System
	Xue X.; Freymueller J.; Lu Z.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	Based on the unscented Kalman filter, we develop a time-dependent inversion filter combining Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) time series observations for modeling volcano deformation. We use the Variance Component Estimation method as means to assign the relative weights for GPS and InSAR data. Then we use the inversion filter to model the posteruptive deformation at Okmok volcano, Alaska. We find that a Mogi source at 3–4 km depth fits the InSAR data well, while the best fit to the GPS data is an oblate spheroid source at about 2.5 km depth. Our final model consists of a shallow sill at ~0.9 km and a Mogi source at ~3.2 km depth, which well fit both the GPS and InSAR data simultaneously. We think the Mogi source obtained here is the same source account for the preeruptive deformation. The shallow sill is a new structure that was not seen before the 2008 eruption. From 2008 to 2019, we have observed five inflation episodes, each of which decays exponential in time. We find that the characteristic timescale of those inflation episodes decreases with respect to time. The total volume change from the two sources is 0.068 km3, which recovers 50–60% of the volume decrease during the 2008 eruption. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	GPS and InSAR; Okmok volcano; Post-eruptive deformation modeling; Time-dependent inversion
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/188003
作者单位	Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, United States; Roy M. Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX, United States
推荐引用方式 GB/T 7714	Xue X.,Freymueller J.,Lu Z.. Modeling the Posteruptive Deformation at Okmok Based on the GPS and InSAR Time Series: Changes in the Shallow Magma Storage System[J],2020,125(2).
APA	Xue X.,Freymueller J.,&Lu Z..(2020).Modeling the Posteruptive Deformation at Okmok Based on the GPS and InSAR Time Series: Changes in the Shallow Magma Storage System.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Xue X.,et al."Modeling the Posteruptive Deformation at Okmok Based on the GPS and InSAR Time Series: Changes in the Shallow Magma Storage System".Journal of Geophysical Research: Solid Earth 125.2(2020).