The 2016 Mw7.8 Kaikoura earthquake struck the northern part of south Island,New Zealand,within the active and complex Australia-Pacific plate boundary system.Firstly,we used the InSAR method to obtain coseismic LOS deformation fields based on SAR images and applied offset tracking methods to obtain offset measurements based on optical satellite images.The maximum displacement of about 6 m is detected in the direction away from the satellite on the south-west side and also towards the satellite on the north-east side.The 3D deformation field is then resolved by the combination of these measure-ments with a least-square solve method,and comparisons with 3 components of GPS stations show good consistency.Despite complex features demonstrated in the 3D deformation field,there are still clear spatial correlations between surface deformation and faults distribution.It reveals that more than ten faults were ruptured during the earthquake,including some faults were previously understudies for their tectonic activities.The maximum horizontal deformation of about 10 m occurs along the Kekerengu fault with the vertical deformation up to 2 m.The 3D deformation shows that the mainshock is a multi-segments faulting with a rupture process of strike-slip,compression,transpressional rupture and strike-slip in space along the NE direction.

Jiao Liu;Guohong Zhang;Jiaqing Wang;Guangtong Sun;Yingfeng Zhang;Yanzhao Wang;Chunyan Qu;Xinjian Shan

State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China;Institute of Disaster Prevention,Yanjiao High Tech Zone,Sanhe City,Hebei Province 065201,China;The First Monitoring and Application Center,China Earthquake Administration,Tianjin 300180,China

大地测量与地球动力学（英文版）

[1]Jiao Liu;Guohong Zhang;Jiaqing Wang;Guangtong Sun;Yingfeng Zhang;Yanzhao Wang;Chunyan Qu;Xinjian Shan-.Three-dimensional coseismic deformation of the 2016 Mw7.8 Kaikuora,New Zealand earthquake obtained by InSAR and offset measurements)[J].大地测量与地球动力学（英文版）,2022(05):415-426

Kaikuora,Kaikoura,understudies,Kekerengu,transpressional

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