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Aftershocks Aftershocks have generally been occurring at the expected rate following a main shock of this size. GNS Science has not ruled out an aftershock as large as magnitude 6 but suspect that the largest aftershock (a 5.6 magnitude quake 20 minutes after the main one) has already happened.
As of 20 January 2011 (2011 -01-20)
Originally posted by TrueAmerican
I think that in order to state that volcanic doom looms for Christchurch as you say, it might be prudent to establish first that the recent quakes are due to volcanic activity, as opposed to tectonic/fault activity. And therein lies the problem with this idea. I'm not saying it's not possible, but just unlikely.
One reason is the recent 7.1. In order to produce such a large earthquake, the size of that one alone would suggest tectonic activity rather than volcanic activity, as it takes a fault of considerable length to even produce such a quake. And the Greendale Fault, just to the west of Christchurch would be such a culprit.
Also supporting tectonic rather than volcanic activity is the issue that such large earthquakes are usually associated with tectonic activity. While there may be exceptions, there are few volcanoes on the planet with enough magma to generate such large earthquakes- and I don't believe any of the ones in New Zealand qualify- at least to known history.
So I am sorry to say I must disagree with the thread premise in itself.
Originally posted by aarys
I live in Christchurch. And i dont think the scare mungering is really that help full. There is no sign of a eruption on banks pennisula.
Originally posted by Tephra Subduction zone volcanoes are especially dangerous because while they appear extinct at times, they are actually just dormant.