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Postseismic Deformation Following the 2016 Kumamoto Earthquake Detected by ALOS-2/PALSAR-2
Manabu Hashimoto
Disaster Prevention Research Institute, Kyoto University
Corresponding Author
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This work is licensed under a CC BY 4.0 License. Read Full License
View the published version at Earth, Planets and Space.
I have been conducting a study of postseismic deformation following the 2016 Kumamoto earthquake using ALOS-2/PALSAR-2 acquired till 2018. I apply ionospheric correction to interferograms of ALOS-2/PALSAR-2. L-band SAR gives us high coherence enough to reveal surface deformation even in vegetated or mountainous area for pairs of images acquired more than 2 years.
Postseismic deformation following the Kumamoto earthquake exceeds 10 cm during two years at some spots in and around Kumamoto city and Aso caldera. Westward motion of ~6 cm/yr was dominant on the southeast side of the Hinagu fault, while westward shift was detected on both side of the Futagawa fault. The area of latter deformation seems to have correlation with distribution of pyroclastic flow deposits. Significant uplift was found around the eastern Futagawa fault and on the southwestern frank of Aso caldera, whose rate reaches 4 cm/yr. There are sharp changes across several coseismic surface ruptures such as Futagawa, Hinagu, and Idenokuchi faults. Rapid subsidence between Futagawa and Idenokuchi faults also found. It is confirmed that local subsidence continued along the Suizenji fault, which newly appeared during the mainshock in Kumamoto City. Subsidence with westward shift of up to 4 cm/yr was also found in Aso caldera.
Time constant of postseismic decay ranges from 1 month to 600 days at selected points, but that postseismic deformation during the first epochs or two are dominant at point in the Kumamoto Plain. This result suggests multiple source of deformation. Westward motion around the Hinagu fault may be explained with right lateral afterslip on the shallow part of this fault. Subsidence along the Suizenji fault can be attributed to normal faulting on dipping westward. Deformation around the Hinagu and Idenokuchi faults cannot be explained with right-lateral afterslip of Futagawa fault, which requires other sources. Deformation in northern part of Aso caldera might be the result of right lateral afterslip on a possible buried fault.
Keywords
Kumamoto earthquake, postseismic deformation, ALOS-2/PALSAR-2, ionospheric correction, InSAR
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- KumamotoEPSFig6.pdf
- KumamotoEPSFig7.pdf
- KumamotoEPSFig8.pdf
- KumamotoEPSFig9.pdf
- KumamotoEPSFig10.pdf
- KumamotoEPSFig11.pdf
- KumamotoEPSFig12.pdf
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- KumamotoEPSFig15.pdf
- SupplementaryTableFigS13.pdf
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On 29 Sep, 2020
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On 28 Sep, 2020
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On 27 Sep, 2020
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On 27 Sep, 2020
Version 2
Posted 03 Aug, 2020
No comments provided
Review #2 received
Received 15 Sep, 2020
Editorial decision: Minor Revision
On 15 Sep, 2020
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On 02 Sep, 2020
Review #1 received
Received 12 Aug, 2020
Reviewers invited
Invitations sent on 10 Aug, 2020
Reviewer #1 agreed
On 10 Aug, 2020
Editor assigned
On 27 Jul, 2020
Submission checks complete
On 26 Jul, 2020
Editor invited
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No comments provided
Editorial decision: Major Revision
On 13 May, 2020
Review #1 received
Received 11 May, 2020
Review #2 received
Received 15 Apr, 2020
Reviewer #2 agreed
On 11 Apr, 2020
Reviewer #1 agreed
On 05 Apr, 2020
Reviewers invited
Invitations sent on 03 Apr, 2020
Editor assigned
On 02 Apr, 2020
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On 01 Apr, 2020
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This preprint is under consideration at Earth, Planets and Space. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Full paper
Postseismic Deformation Following the 2016 Kumamoto Earthquake Detected by ALOS-2/PALSAR-2
Manabu Hashimoto
Disaster Prevention Research Institute, Kyoto University
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
Published
On 20 Oct, 2020
No community comments so far
Editorial decision: Accept
On 29 Sep, 2020
Editor assigned
On 28 Sep, 2020
Submission checks complete
On 27 Sep, 2020
Editor invited
On 27 Sep, 2020
Version 2
Posted 03 Aug, 2020
No comments provided
Review #2 received
Received 15 Sep, 2020
Editorial decision: Minor Revision
On 15 Sep, 2020
Reviewer #2 agreed
On 02 Sep, 2020
Review #1 received
Received 12 Aug, 2020
Reviewers invited
Invitations sent on 10 Aug, 2020
Reviewer #1 agreed
On 10 Aug, 2020
Editor assigned
On 27 Jul, 2020
Submission checks complete
On 26 Jul, 2020
Editor invited
On 26 Jul, 2020
No comments provided
Editorial decision: Major Revision
On 13 May, 2020
Review #1 received
Received 11 May, 2020
Review #2 received
Received 15 Apr, 2020
Reviewer #2 agreed
On 11 Apr, 2020
Reviewer #1 agreed
On 05 Apr, 2020
Reviewers invited
Invitations sent on 03 Apr, 2020
Editor assigned
On 02 Apr, 2020
Submission checks complete
On 01 Apr, 2020
Editor invited
On 01 Apr, 2020
First submitted
On 31 Mar, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published version at Earth, Planets and Space.
I have been conducting a study of postseismic deformation following the 2016 Kumamoto earthquake using ALOS-2/PALSAR-2 acquired till 2018. I apply ionospheric correction to interferograms of ALOS-2/PALSAR-2. L-band SAR gives us high coherence enough to reveal surface deformation even in vegetated or mountainous area for pairs of images acquired more than 2 years.
Postseismic deformation following the Kumamoto earthquake exceeds 10 cm during two years at some spots in and around Kumamoto city and Aso caldera. Westward motion of ~6 cm/yr was dominant on the southeast side of the Hinagu fault, while westward shift was detected on both side of the Futagawa fault. The area of latter deformation seems to have correlation with distribution of pyroclastic flow deposits. Significant uplift was found around the eastern Futagawa fault and on the southwestern frank of Aso caldera, whose rate reaches 4 cm/yr. There are sharp changes across several coseismic surface ruptures such as Futagawa, Hinagu, and Idenokuchi faults. Rapid subsidence between Futagawa and Idenokuchi faults also found. It is confirmed that local subsidence continued along the Suizenji fault, which newly appeared during the mainshock in Kumamoto City. Subsidence with westward shift of up to 4 cm/yr was also found in Aso caldera.
Time constant of postseismic decay ranges from 1 month to 600 days at selected points, but that postseismic deformation during the first epochs or two are dominant at point in the Kumamoto Plain. This result suggests multiple source of deformation. Westward motion around the Hinagu fault may be explained with right lateral afterslip on the shallow part of this fault. Subsidence along the Suizenji fault can be attributed to normal faulting on dipping westward. Deformation around the Hinagu and Idenokuchi faults cannot be explained with right-lateral afterslip of Futagawa fault, which requires other sources. Deformation in northern part of Aso caldera might be the result of right lateral afterslip on a possible buried fault.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Due to technical limitations, full-text HTML conversion of this manuscript could not be completed. However, the latest manuscript can be downloaded and accessed as a PDF.