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Title: Changes in widespread aquifer properties caused by a magnitude 6-class earthquake evaluated using InSAR analyses
Authors: Shigemitsu, Yutaro
Ishitsuka, Kazuya  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-4462-4598 (unconfirmed)
Lin, Weiren
Author's alias: 重光, 勇太朗
石塚, 師也
林, 為人
Keywords: PSInSAR
2018 northern Osaka earthquake
Groundwater level change
Aquifer properties
Correlation coefficient
Issue Date: Aug-2023
Publisher: Elsevier BV
Journal title: International Journal of Applied Earth Observation and Geoinformation
Volume: 122
Thesis number: 103394
Abstract: Correlations between surface displacements and groundwater level changes have been widely used to understand aquifer properties and their site characteristics; however, the underlying mechanisms of various correlation types and the influence of earthquakes have not been fully investigated. In this study, we examine correlations between surface displacements from interferometric synthetic aperture radar analyses and groundwater level monitoring data in Osaka and Kyoto, Japan, over 4 years, a period including the 18 June 2018 Mw 5.6 northern Osaka earthquake. Both positive and negative correlations between the seasonal groundwater level changes and the seasonal surface displacements are identified. Based on the observations of the effects of the earthquake, a new conceptual aquifer dynamical model driving the relationship between the surface displacements and the groundwater level changes is proposed. We further reveal that sites with negative correlations increased after the earthquake, suggesting that the earthquake increased the groundwater recharge rate as a result of increases in aquifer transportation properties such as permeability and porosity.
Rights: © 2023 The Authors. Published by Elsevier B.V.
This is an open access article under the CC BY license.
URI: http://hdl.handle.net/2433/284579
DOI(Published Version): 10.1016/j.jag.2023.103394
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