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2009 Fiordland earthquake
The 2009 Fiordland earthquake struck the South Island of New Zealand with a magnitude of 7.8 at 9:22 pm (NZST) on 15 July. The earthquake was centred in the remote region of Fiordland, with the epicentre located west-north-west of Invercargill near Dusky Sound in Fiordland National Park, at a depth of .〔 It is the largest New Zealand earthquake since the 1931 Hawke's Bay earthquake, which also had a magnitude of 7.8.〔
==Earthquake==
The main shock was a reverse fault (thrust), with the Indo-Australian Plate subducting beneath the Pacific Plate.〔 The earthquake lifted a large area of land around the epicenter approximately 1 metre.
New Zealand's Institute of Geological and Nuclear Sciences (GNS Science) initially measured the earthquake at magnitude 6.6, but later revised the magnitude to 7.8.
The reported energy release was compared to "500 million tonnes of TNT,() 25,000 times more powerful than the atomic bomb dropped on Nagasaki in 1945".
The quake twisted New Zealand's South Island, with Puysegur Point, on the Southwestern tip of the island, moving 30 cm closer to Australia (westward); Te Anau moved 10 cm, Bluff 3 cm and Dunedin 1 cm. It is also believed to have caused an increased stress in the southern, offshore part of the Alpine Fault.
A considerable number of aftershocks were recorded.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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