| Title | Crustal deformation and stress transfer during a propagating earthquake sequence: The 2013 Cook Strait sequence, central New Zealand |
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| Author | Hamling, I J; D'Anastasio, E; Wallace, L M; Ellis, S; Motagh, M; Samsonov, S ; Palmer, N; Hreinsdóttir, S |
| Source | Journal of Geophysical Research, Solid Earth vol. 119, issue 7, 2014 p. 6080-6092, https://doi.org/10.1002/2014JB011084  Open Access |
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| Year | 2014 |
| Alt Series | Earth Sciences Sector, Contribution Series 20150245 |
| Publisher | Wiley-Blackwell |
| Document | serial |
| Lang. | English |
| Media | paper; digital; on-line |
| File format | pdf |
| Area | Cook Strait; New Zealand |
| Lat/Long WENS | 172.2000 174.0833 -41.3167 -41.8333 |
| Subjects | tectonics; geophysics; crustal movements; crustal studies; deformation; earthquakes; earthquake studies; earthquake mechanisms; stress analyses; remote sensing |
| Illustrations | location maps; satellite images; models |
| Released | 2014 07 24 |
| Abstract | The 2013 Cook Strait earthquake sequence began on 18 July 2013 with two foreshocks of Mw 5.7 and Mw 5.8 and culminated in the Mw 6.6 Cook Strait and Lake Grassmere events on 21 July and 16 August,
respectively. Located ~50 km south of New Zealand's capital, Wellington, the earthquakes generated the most significant ground shaking in the Wellington and Marlborough regions in recent decades. During the first event, located under Cook Strait,
continuously recording GPS instruments across central New Zealand recorded up to 5 cm of horizontal displacement. Modeling suggests that the rupture was 25 km long with up to 90 cm of dextral strike slip. The second event, located 20?km to the
southwest, caused displacements of up to 25 cm at GPS sites located around the Clifford bay area. In addition, two interferograms from RADARSAT-2 and TerraSAR-X showed up to 30 cm of line-of-sight displacement in the vicinity of Lake Grassmere.
Modeling indicates predominantly dextral strike slip of up to 2.1 m. Coulomb Stress changes induced by the earlier foreshocks suggest that the Cook Strait event was triggered by the preceding events and that the Lake Grassmere event was subsequently
triggered by the Cook Strait earthquake. |
| GEOSCAN ID | 296928 |
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