Abstract

The Kumamoto earthquake is analyzed mainly with InSAR data combined with strong earthquake and GPS data, using a variety of joint InSAR technology methods and multisource data solution methods and comprehensively considering the normalization and weighting of multisource data. The three-dimensional (3D) deformation field is determined. The results show that the joint solution of multisource data can improve the accuracy of the 3D solution deformation results to a certain extent. From the 3D solution results, the maximum east-west deformation caused by the 2016 Kumamoto earthquake is approximately 2 m; the north-south direction mainly manifests expansion and stretching; the northwestern side subsides vertically, with a maximum subsidence of 2 m; and the southeastern side is uplifted. The horizontal deformation characteristics show that the earthquake is dominated by right-lateral strike-slip; the strike is NE-SW, the dip of the seismogenic fault is nearly vertical, and the Futagawa fault has a few normal fault properties. By analyzing the coseismic 3D deformation field, the seismogenic fault can be better understood, which provides a foundation for studying seismic mechanisms.

Highlights

  • The Kumamoto earthquake is analyzed mainly with interferometric synthetic aperture radar (InSAR) data combined with strong earthquake and GPS data, using a variety of joint InSAR technology methods and multisource data solution methods and comprehensively considering the normalization and weighting of multisource data

  • The results show that the joint solution of multisource data can improve the accuracy of the 3D solution deformation results to a certain extent

  • These results reveal that the difference curves at points 3, 5, and 7 with GPS and strong motion data in the 3D solution results obtained by a combination of multiple InSAR technologies fluctuate greatly

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Summary

10 Abstract

The Kumamoto earthquake is analyzed mainly with InSAR data combined with strong earthquake and GPS data, using a variety of joint InSAR technology methods and multisource data solution methods and comprehensively considering the normalization and weighting of multisource data. The three-dimensional (3D) deformation field is determined. From the 3D solution results, the maximum east-west deformation caused by the 2016 Kumamoto earthquake. The horizontal deformation characteristics show that the earthquake is dominated by right-lateral strike-slip; the strike is NE-SW, the dip of the seismogenic fault is nearly vertical, and the Futagawa fault has a few normal fault properties. By analyzing the coseismic 3D deformation field, the seismogenic fault can be better understood, which provides a foundation for studying seismic

Introduction
Geological setting
Coseismic deformation field
InSAR data and coseismic deformation field
Using MAI to obtain the azimuth deformation field
Three-dimensional deformation field acquisition
Solution of the 3D deformation field of Multisource data based on least squares
Solution of the 3D deformation field of the Kumamoto earthquake in Japan
295 4.4 Results and analysis
Conclusion

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