SAR interferometry using ALOS-2 PALSAR-2 data for the Mw 7.8 Gorkha, Nepal earthquake

Ryo Natsuaki, Hiroto Nagai, Takeshi Motohka, Masato Ohki, Manabu Watanabe, Rajesh B. Thapa, Takeo Tadono, Masanobu Shimada, Shinichi Suzuki

研究成果: Article

17 引用 (Scopus)

抄録

The Advanced Land Observing Satellite-2 (ALOS-2, "DAICHI-2") has been observing Nepal with the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) in response to an emergency request from Sentinel Asia related to the Mw 7.8 Gorkha earthquake on April 25, 2015. PALSAR-2 successfully detected not only avalanches and local crustal displacements but also continental-scale deformation. Especially, by the use of the ScanSAR mode, we are able to make interferograms that cover the entire displacement area of the earthquake. However, we did encounter some fundamental problems with the ScanSAR and incorrect settings of PALSAR-2 operation that have now been fixed. They include (1) burst overlap misalignment between two ScanSAR observations, which limits the number of pairs available and the quality of the interferogram, (2) non-crustal fringes which are derived from co-registration error and/or ionospheric effect and, (3) incorrect setting of the center frequency in the Stripmap beam F2-6. In this paper, we describe their problems and solutions. The number of interferometric pairs are limited by (1) and (3). The accuracy of the interferograms are limited by (2) and (3). The experimental results showed that current solutions for (2) and (3) work appropriately.

元の言語English
記事番号15
ジャーナルEarth, Planets and Space
68
発行部数1
DOI
出版物ステータスPublished - 2016 12 1
外部発表Yes

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Nepal
PALSAR
ALOS
phased arrays
ultrahigh frequencies
synthetic aperture radar
interferometry
earthquakes
earthquake
emergencies
avalanche
misalignment
encounters
avalanches
ionospherics
bursts

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

これを引用

SAR interferometry using ALOS-2 PALSAR-2 data for the Mw 7.8 Gorkha, Nepal earthquake. / Natsuaki, Ryo; Nagai, Hiroto; Motohka, Takeshi; Ohki, Masato; Watanabe, Manabu; B. Thapa, Rajesh; Tadono, Takeo; Shimada, Masanobu; Suzuki, Shinichi.

:: Earth, Planets and Space, 巻 68, 番号 1, 15, 01.12.2016.

研究成果: Article

Natsuaki, R, Nagai, H, Motohka, T, Ohki, M, Watanabe, M, B. Thapa, R, Tadono, T, Shimada, M & Suzuki, S 2016, 'SAR interferometry using ALOS-2 PALSAR-2 data for the Mw 7.8 Gorkha, Nepal earthquake', Earth, Planets and Space, 巻. 68, 番号 1, 15. https://doi.org/10.1186/s40623-016-0394-4
Natsuaki, Ryo ; Nagai, Hiroto ; Motohka, Takeshi ; Ohki, Masato ; Watanabe, Manabu ; B. Thapa, Rajesh ; Tadono, Takeo ; Shimada, Masanobu ; Suzuki, Shinichi. / SAR interferometry using ALOS-2 PALSAR-2 data for the Mw 7.8 Gorkha, Nepal earthquake. :: Earth, Planets and Space. 2016 ; 巻 68, 番号 1.
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AU - Natsuaki, Ryo

AU - Nagai, Hiroto

AU - Motohka, Takeshi

AU - Ohki, Masato

AU - Watanabe, Manabu

AU - B. Thapa, Rajesh

AU - Tadono, Takeo

AU - Shimada, Masanobu

AU - Suzuki, Shinichi

PY - 2016/12/1

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N2 - The Advanced Land Observing Satellite-2 (ALOS-2, "DAICHI-2") has been observing Nepal with the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) in response to an emergency request from Sentinel Asia related to the Mw 7.8 Gorkha earthquake on April 25, 2015. PALSAR-2 successfully detected not only avalanches and local crustal displacements but also continental-scale deformation. Especially, by the use of the ScanSAR mode, we are able to make interferograms that cover the entire displacement area of the earthquake. However, we did encounter some fundamental problems with the ScanSAR and incorrect settings of PALSAR-2 operation that have now been fixed. They include (1) burst overlap misalignment between two ScanSAR observations, which limits the number of pairs available and the quality of the interferogram, (2) non-crustal fringes which are derived from co-registration error and/or ionospheric effect and, (3) incorrect setting of the center frequency in the Stripmap beam F2-6. In this paper, we describe their problems and solutions. The number of interferometric pairs are limited by (1) and (3). The accuracy of the interferograms are limited by (2) and (3). The experimental results showed that current solutions for (2) and (3) work appropriately.

AB - The Advanced Land Observing Satellite-2 (ALOS-2, "DAICHI-2") has been observing Nepal with the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) in response to an emergency request from Sentinel Asia related to the Mw 7.8 Gorkha earthquake on April 25, 2015. PALSAR-2 successfully detected not only avalanches and local crustal displacements but also continental-scale deformation. Especially, by the use of the ScanSAR mode, we are able to make interferograms that cover the entire displacement area of the earthquake. However, we did encounter some fundamental problems with the ScanSAR and incorrect settings of PALSAR-2 operation that have now been fixed. They include (1) burst overlap misalignment between two ScanSAR observations, which limits the number of pairs available and the quality of the interferogram, (2) non-crustal fringes which are derived from co-registration error and/or ionospheric effect and, (3) incorrect setting of the center frequency in the Stripmap beam F2-6. In this paper, we describe their problems and solutions. The number of interferometric pairs are limited by (1) and (3). The accuracy of the interferograms are limited by (2) and (3). The experimental results showed that current solutions for (2) and (3) work appropriately.

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KW - InSAR

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KW - Synthetic Aperture Radar (SAR)

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