Space Imaging Geodesy Reveals Near Circular, Coseismic Block Rotation During the 2016 M<SUB>w</SUB> 7.8 Kaikōura Earthquake, New Zealand - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2020

Space Imaging Geodesy Reveals Near Circular, Coseismic Block Rotation During the 2016 Mw 7.8 Kaikōura Earthquake, New Zealand

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Teng Wang
  • Function : Author
Paul Tapponnier
  • Function : Author
Xuhua Shi
  • Function : Author
Shengji Wei
  • Function : Author

Abstract

Large earthquakes usually rupture plate boundary faults, releasing the accumulated stress as displacements localized along smooth, narrow faults. However, certain earthquakes initiate off main faults, rupturing adjacent, secondary faults. The mechanisms of such atypical stress release remain enigmatic, partly due to a lack of detailed geodetic evidence. Here using the 3D coseismic displacement field derived from space imaging geodesy, we detect 10-km-scale, nearly-circular coseismic block rotation during the 2016 Mw 7.8 Kaikōura earthquake in New Zealand. Together, geodetic observations, longer term local paleomagnetic data, analytical, and discrete element modeling imply that localized block rotation occurred south of the Hope fault along weak, steep, bedding-parallel boundaries within a narrow, ~20-km-wide dextral shear zone. That stress near plate boundary faults can be partially released in zones of distributed ruptures absorbing coseismic rotation may retard rupture along main faults. Our observations also suggest that coseismic rotation may help accomodate plate boundary propagation.
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insu-03584387 , version 1 (22-02-2022)

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Teng Wang, Liqing Jiao, Paul Tapponnier, Xuhua Shi, Shengji Wei. Space Imaging Geodesy Reveals Near Circular, Coseismic Block Rotation During the 2016 Mw 7.8 Kaikōura Earthquake, New Zealand. Geophysical Research Letters, 2020, 47, pp.279-283. ⟨10.1029/2020GL090206⟩. ⟨insu-03584387⟩
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