Abstract
This paper provides a brief discussion of observed strong ground motions from the 14 November 2016 Mw7.8 Kaikōura earthquake. Specific attention is given to examining observations in the near-source region where several ground motions exceeding 1.0g horizontal are recorded, as well as up to 2.7g in the vertical direction at one location. Ground motion response spectra in the near-source, North Canterbury, Marlborough and Wellington regions are also examined and compared with design levels. Observed spectral amplitudes are also compared with predictions from empirical and physics-based ground motion modelling.
Highlights
On 14 November 2016 at 12:02 AM local time, the Mw7.8 ’Kaikoura’ earthquake occurred along the east coast of the upper South Island, New Zealand [1, 2]
In the subsequent sections we first summarize the tectonic setting and inferred rupture, followed by a discussion of the observed ground motions in various contexts, and inferences based on ground motion modelling
This paper has provided a summary of observed ground motions from the 14 November 2016 Mw7.8 Kaikoura earthquake
Summary
On 14 November 2016 at 12:02 AM local time, the Mw7.8 ’Kaikoura’ earthquake occurred along the east coast of the upper South Island, New Zealand [1, 2]. The earthquake initiated in the Waiau Plains in North Canterbury, and involved multiple fault segments as the rupture generally propagated northward over 150km to Cape Campbell in Marlborough. It was the largest recorded earthquake in New Zealand since the 1855 Mw8.2 − 8.3 Wairarapa earthquake [3]. Litchfield et al [4] have so far identified at least nine fault segments (The Humps, Hundelee, Conway-Charwell, Upper Kowai, Fidget, Jordan Thrust, Papatea, Kekerengu, and Needles Faults) that have evidence of surface fault rupture. Essentially no surface rupture of the Hope Fault (the major fault identified apriori in the region [11]) has been mapped to date [4]
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