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Originally posted by muzzy
Theres is some confusion about what happened_ perhaps there was two quakes close together_ as has been happening in other parts of the World lately ie Moro Gulf, New Britain PNG, Samoa etc
The Minister of Civil Defence keeps saying 7.4 and 7.1 aftershock, but none of the geological sites have anything to back this up _ stupid politician
It looks like the 7.4 has been downgraded to 7.1, but not sure if thats just Geonet towing the USGS line and converting to Mw or its still ML.
Certainly some major damage north of ChCh, Kaiapoi way.
If its anything like last years Dusky Sound quake the aftershocks will go on for months. GNS Geologist on TV said they are looking for a fault rupture near Darfield of 100km x 2-3 metres high
edit: I just in checked again;
its 7.4ML OR 7.1Mw, not 7.4 and 7.1
[edit on 3-9-2010 by muzzy]
Originally posted by berkeleygal
Everyone, send your good vibes and prayers MoorfNZ's way!
I hate it that she is going thru this.
There are four main hazards from earthquakes: shaking, faulting, tsunamis, and ground failure. Liquefaction is how shaking causes ground failure. If you've played on the beach, you can see how it works: find a patch of wet sand down in the surf zone. It may be firm enough to walk on, but if you pat it a few times the saturated sand turns to muck. In earthquakes, the same thing occurs in buried layers of young sediment, down at the water table as deep as 10 or 20 meters