Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/151794
Title: Space imaging geodesy reveals near circular, coseismic block rotation during the 2016 Mw 7.8 Kaikōura earthquake, New Zealand
Authors: Wang, Teng
Jiao, Liqing
Tapponnier, Paul
Shi, Xuhua
Wei, Shengji
Keywords: Science::Geology
Issue Date: 2020
Source: Wang, T., Jiao, L., Tapponnier, P., Shi, X. & Wei, S. (2020). Space imaging geodesy reveals near circular, coseismic block rotation during the 2016 Mw 7.8 Kaikōura earthquake, New Zealand. Geophysical Research Letters, 47(22), e2020GL090206-. https://dx.doi.org/10.1029/2020GL090206
Journal: Geophysical Research Letters 
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.
URI: https://hdl.handle.net/10356/151794
ISSN: 0094-8276
DOI: 10.1029/2020GL090206
Rights: © 2020 American Geophysical Union. All rights reserved. This paper was published in Geophysical Research Letters and is made available with permission of American Geophysical Union.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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