On Mon, 2010-09-06 at 09:23 +1200, Rik Tindall wrote: > From 18 years here observing this, most Chch earthquakes don't manifest > on the Port Hills / Banks Peninsula - because it is a different and most > ancient rock mass (volcanic) next to Alps & Plains. But this quake is > connecting signifiantly & feels like the Pacific Plate may still be in > steady slow motion.. > The Pacific plate is constantly moving relative to and under the Australian one. This is what has created the Southern Alps where the Pacific plate gets deep enough under the Australian one to melt ( known as a subduction zone ). This is the opposite from the North Island, where the volcanics are on the eastern side. There's a big tear through the Cook Straits because of this contrariness.
Was the subject of my final year's dissertation for my Geology degree (: Steve -- Steve Holdoway <[email protected]> http://www.greengecko.co.nz MSN: [email protected] Skype: sholdowa
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