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1929 Arthur's Pass earthquake : ウィキペディア英語版 | 1929 Arthur's Pass earthquake
The 1929 Arthur's Pass earthquake occurred at on 9 March. The sparsely settled region of the Southern Alps shook for four minutes. Tremors continued almost continuously until midnight and sporadic strong aftershocks were felt for several days. The earthquake was measured at 7.1 on the Richter Scale and the intensity of shaking in the epicentral region has been assessed from historical records as VIII (''Severe'') on the Modified Mercalli Scale. Intensities of VI (''Strong'') were observed in Christchurch and Westport.〔 The earthquake occurred on the Poulter Fault, which was not identified and mapped until 2001. ==Tectonic setting== New Zealand lies along the boundary between the Australian and Pacific plates. In the South Island most of the relative displacement between these plates is taken up along a single dextral (right lateral) strike-slip fault with a major reverse component, the Alpine Fault. In the North Island the displacement is mainly taken up along the Kermadec-Tonga subduction zone, although the remaining dextral strike-slip component is accommodated by the North Island Fault System.〔(Mouslopoulou,V., Nicol,A., Little, T.A. & Walsh, J.J. 2007. Terminations of large strike-slip faults: an alternative model from New Zealand. In: Cunningham, W. D. & Mann, P (eds).Tectonics of Strike-Slip Restraining and Releasing Bends. Geological Society of London, Special Publication, 290; p. 387-415. )〕 The Poulter Fault runs for approximately 50 km Northeast from the junction of the Bealey and Mahinga rivers to the valley of the Hurunui River. Between 16 km and 36 km of the fault ruptured, with dextral displacement of up to 4 metres and dip-slip displacement of 1–2 metres (North side up).
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