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Nationwide urban ground deformation monitoring in Japan using Sentinel-1 LiCSAR products and LiCSBAS
Progress in Earth and Planetary Science ( IF 3.9 ) Pub Date : 2021-01-12 , DOI: 10.1186/s40645-020-00402-7
Yu Morishita

Ground subsidence in urban areas is a significant problem because it increases flood risk, damages buildings and infrastructure, and results in economic loss. Continual monitoring of ground deformation is important for early detection, mechanism understanding, countermeasure implementation, and deformation prediction. The Sentinel-1 satellite constellation has globally and freely provided frequent and abundant SAR data and enabled nationwide deformation monitoring through InSAR time series analysis. LiCSAR, an automatic Sentinel-1 interferometric processing system, has produced abundant interferograms with global coverage, and the products are freely accessible and downloadable through a web portal. LiCSBAS, an open source InSAR time series analysis package integrated with LiCSAR, enables users to obtain the deformation time series easily and quickly. In this study, spatially and temporally detailed deformation time series and velocities from the LiCSAR products using LiCSBAS for 73 major urban areas in Japan during 2014–2020 were derived. All LiCSBAS processing was automatically performed using predefined parameters. Many deformation signals with various temporal and spatial features, such as linear subsidence in Hirosaki, Kujyukuri, Niigata, and Kanazawa, episodic subsidence in Sanjo, annual vertical fluctuation in Hirosaki, Yamagata, Yonezawa, Ojiya, and Nogi, and linear uplift in Chofu were detected. Unknown small nonlinear uplift signals were found in Nara and Osaka in 2018. Complex postseismic deformations from the 2016 Kumamoto earthquake were also revealed. All the deformation data obtained in this study are available on an open repository and are expected to be used for further research, investigation, or interpretation. This nationwide monitoring approach using the LiCSAR products and LiCSBAS is easy to implement and applicable to other areas worldwide.



中文翻译:

使用Sentinel-1 LiCSAR产品和LiCSBAS在日本全国范围内进行城市地面变形监测

城市地区的地面沉降是一个重大问题,因为它会增加洪水风险,破坏建筑物和基础设施并造成经济损失。持续监测地面变形对早期发现,机理理解,对策实施和变形预测非常重要。Sentinel-1卫星星座已在全球范围内免费提供了频繁且丰富的SAR数据,并通过InSAR时间序列分析实现了全国范围的变形监测。LiCSAR是一种自动Sentinel-1干涉处理系统,已产生了覆盖全球的大量干涉图,并且可以通过Web门户免费访问和下载产品。LiCSBAS,一个与LiCSAR集成的开源InSAR时间序列分析软件包,使用户能够轻松快速地获取变形时间序列。在这项研究中,使用LiCSBAS从LiCSAR产品推算出2014-2020年日本73个主要城市地区的时空变形时间序列和速度。所有LiCSBAS处理都是使用预定义参数自动执行的。具有许多时空特征的形变信号,例如弘前,九十九里,新泻和金泽的线性沉降,三条的偶发性沉降,弘前,山形,米泽,小谷和野木的年垂直波动,以及调布的线性抬升检测到。2018年在奈良和大阪发现了未知的小的非线性隆升信号。还揭示了2016年熊本地震的复杂地震后变形。这项研究中获得的所有变形数据都可以在一个开放的存储库中获得,并有望用于进一步的研究,调查或解释。这种使用LiCSAR产品和LiCSBAS的全国性监测方法易于实施,并适用于全球其他地区。

更新日期:2021-01-12
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