干旱区生态环境知识资源中心(Arid): Bayesian Inversion for a Stress-Driven Model of Afterslip and Viscoelastic Relaxation: Method and Application to Postseismic Deformation Following the 2011 M-W 9.0 Tohoku-Oki Earthquake

Arid

DOI	10.1029/2020JB021620
	Bayesian Inversion for a Stress-Driven Model of Afterslip and Viscoelastic Relaxation: Method and Application to Postseismic Deformation Following the 2011 M-W 9.0 Tohoku-Oki Earthquake
	Fukuda, Junichi; Johnson, Kaj M.
通讯作者	Fukuda, J (corresponding author), Univ Tokyo, Earthquake Res Inst, Tokyo, Japan.
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN	2169-9313
EISSN	2169-9356
出版年	2021
卷号	126 期号:5
英文摘要	Postseismic deformation following great subduction earthquakes is commonly modeled as the sum of the contributions from afterslip on the megathrust and viscoelastic relaxation of the coseismic stress changes in the mantle. However, it is generally difficult to separate the contributions of these mechanisms to geodetically observed postseismic deformation. Here we develop an inversion method for estimating the parameters of a stress-driven postseismic deformation model that incorporates velocity-strengthening afterslip and viscoelastic mantle relaxation governed by a biviscous Burgers rheology using coseismic and postseismic geodetic data. We assume that afterslip and viscoelastic relaxation are driven by coseismic stress changes and interact mechanically with each other. The unknown parameters to be estimated include the coseismic slip distribution that drives the postseismic processes, and the fault frictional and mantle viscosity parameters. We present a Bayesian formulation of the inverse problem and an algorithm for estimating the posterior probability density function. This approach allows us to quantify the uncertainties of the model parameters. We apply the method to the coseismic displacements and postseismic displacement time series of the 2011 Tohoku-Oki earthquake. Our results show that the observations place tight constraints on the model parameters, with the estimated model effectively reproducing the first-order spatial and temporal patterns of horizontal and vertical postseismic deformation. We find that the relative contributions of afterslip and viscoelastic relaxation to horizontal and vertical postseismic deformation vary in space. We suggest that our method may potentially provide a way to objectively separate the contributions of these two mechanisms to postseismic deformation.
英文关键词	afterslip Bayesian inversion postseismic deformation viscoelastic relaxation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000654526100082
WOS关键词	RIKU-U EARTHQUAKE ; NORTHERN JAPAN ; SUBDUCTION EARTHQUAKES ; NEIGHBORHOOD ALGORITHM ; GEOPHYSICAL INVERSION ; FRICTIONAL-PROPERTIES ; SPATIAL-DISTRIBUTION ; TRANSIENT RHEOLOGY ; UPPERMOST MANTLE ; MOJAVE-DESERT
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350847
作者单位	[Fukuda, Junichi] Univ Tokyo, Earthquake Res Inst, Tokyo, Japan; [Johnson, Kaj M.] Indiana Univ, Dept Earth & Atmospher Sci, Bloomington, IN USA
推荐引用方式 GB/T 7714	Fukuda, Junichi,Johnson, Kaj M.. Bayesian Inversion for a Stress-Driven Model of Afterslip and Viscoelastic Relaxation: Method and Application to Postseismic Deformation Following the 2011 M-W 9.0 Tohoku-Oki Earthquake[J],2021,126(5).
APA	Fukuda, Junichi,&Johnson, Kaj M..(2021).Bayesian Inversion for a Stress-Driven Model of Afterslip and Viscoelastic Relaxation: Method and Application to Postseismic Deformation Following the 2011 M-W 9.0 Tohoku-Oki Earthquake.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(5).
MLA	Fukuda, Junichi,et al."Bayesian Inversion for a Stress-Driven Model of Afterslip and Viscoelastic Relaxation: Method and Application to Postseismic Deformation Following the 2011 M-W 9.0 Tohoku-Oki Earthquake".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.5(2021).