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  1. 防災科研関係論文

Development of Portable SAR for Detection of Volcano Deformation: Application of SAR Interferometry to the Repeated Observation Data

https://nied-repo.bosai.go.jp/records/3687
https://nied-repo.bosai.go.jp/records/3687
20f8c059-28a6-4a6f-923a-1c02dac04a26
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 en
タイトル Development of Portable SAR for Detection of Volcano Deformation: Application of SAR Interferometry to the Repeated Observation Data
言語
言語 eng
著者 Taku Ozawa

× Taku Ozawa

en Taku Ozawa

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Yuji Himematsu

× Yuji Himematsu

en Yuji Himematsu

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Akira Nohmi

× Akira Nohmi

en Akira Nohmi

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Masanori Miyawaki

× Masanori Miyawaki

en Masanori Miyawaki

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抄録
内容記述タイプ Other
内容記述 Synthetic aperture radar (SAR), which transmits radar waves from the ground, can detect crustal deformation with high spatial and temporal resolution. To obtain crustal deformation data useful for evaluating volcanic activity, we are developing a portable SAR that can conduct repeated observations without being fixed to the site under Project B of the Integrated Program for Next Generation Volcano Research and Human Resource Development. We named this SAR sensor: SAR for crustal deformation with portable equipment (SCOPE). SCOPE detects crustal deformation over a wide area by repeating observations at several points, which differs from the general ground-based SAR (GB-SAR). SCOPE has four observation types: GB-SAR, car-borne SAR, cart-borne SAR, and man-borne SAR, which are used to conduct such mobile observations efficiently. This study performed repeated observations with a 1-day interval using GB-SAR and car-borne SAR and obtained high coherence and reasonable phase distribution. When using the man-borne SAR type, moderate coherence was obtained. However, focusing on the SAR image was insufficient, and an inappropriate phase slope appeared in the interferogram, suggesting that improvements in the observation and analysis methods remained. We also investigated the temporal persistence of coherence when applying SAR interferometry to the SCOPE data. Sufficient coherence was obtained to detect crustal deformation in sparsely vegetated areas for a data pair at a 1-year interval. Even in densely vegetated areas, sufficient coherence was obtained from the data pair at intervals of several months. These results show that SCOPE has high potential for detecting crustal deformation based on repeated observations.
言語 en
書誌情報 en : Journal of Disaster Research

巻 17, 号 5, p. 609-619, 発行日 2022-08-01
出版者
言語 en
出版者 Fuji Technology Press Ltd.
ISSN
収録物識別子タイプ EISSN
収録物識別子 1883-8030
DOI
関連識別子 10.20965/jdr.2022.p0609
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