> Russell,
>
> Just heard that Christchurch has been trashed by another earthquake early this
> afternoon.
>
> Similar strength to last time (6.3 magnitude) but mach shallower and almost
> directly below Lyttleton.
>
> Much damage in Lyttleton and central Christchurch.
>
> Main spire of Christchurch Cathedral has come down.
>
> More anon.
>
> Regards,
>
> Ken Mardle

> > We have several Kiwi's at work, one from Christchurch, we've been
> following
> > the vision from TVNZ via Channel 10 here and the NZ Herald.
> >
> > The 10 storey TV3 building just disappearing - all terrible.
> >
> > Heard an Oz doctor there for a conference complaining no one had told him
> > where he was to stay tonight as his hotel was out of bounds.
>
> Bleedin' Ozzie ... tell him to go to a hospital, they can probably put him
> to work ...
>
> Was a bit of a shock to have the radio alarm come on with the earthquake as
> headline news.
>
> Nephew accounted for.
>
> Sister in law, her husband and daughter accounted for. Apparently it took
> her 3 1/2 hours to drive out of the centre of the city to her home, a trip
> that normally takes around 30 minutes. The streets were just grid locked.
> Their house is structurally fine, driveway is a mess, house contents a mess
> on the floor.
>
> Still need to account for a cousin.
> --
> Scanned by iCritical.
>

> On 22 February 2011 09:37,  <KILLspamalan.b.pearceKILLspamstfc.ac.uk> wrote:
>>> We have several Kiwi's at work, one from Christchurch, we've been following
>>> the vision from TVNZ via Channel 10 here and the NZ Herald.
>>>
>>> The 10 storey TV3 building just disappearing - all terrible.
>>>
>>> Heard an Oz doctor there for a conference complaining no one had told him
>>> where he was to stay tonight as his hotel was out of bounds.
>>
>> Bleedin' Ozzie ... tell him to go to a hospital, they can probably put him to work ...
>>
>> Was a bit of a shock to have the radio alarm come on with the earthquake as headline news.
>>
>> Nephew accounted for.
>>
>> Sister in law, her husband and daughter accounted for. Apparently it took her 3 1/2 hours to drive out of the centre of the city to her home, a trip that normally takes around 30 minutes. The streets were just grid locked. Their house is structurally fine, driveway is a mess, house contents a mess on the floor.
>>
>> Still need to account for a cousin.
>> --
>> Scanned by iCritical.
>>

> Severe,
> Near direct hit in city and shallow. 6.3 followded by 5.6 about 5 minutes later.
>
> Technical - earthquake.usgs.gov/earthquakes/pager/events/us/b0001igm/index.html
> Map - http://earthquake.usgs.gov/earthquakes/pager/events/us/b0001igm/exposure.png
>
>
>
>> Russell,
>>
>> Just heard that Christchurch has been trashed by another earthquake early this
>> afternoon.
>>
>> Similar strength to last time (6.3 magnitude) but mach shallower and almost
>> directly below Lyttleton.
>>
>> Much damage in Lyttleton and central Christchurch.
>>
>> Main spire of Christchurch Cathedral has come down.
>>
>> More anon.
>>
>> Regards,
>>
>> Ken Mardle
>>
>

> That's what we like about Northern Ohio. We do get once a year or so,
> light tremors, magnitude 1 is heavy. But no poisonous snakes or other
> critters, bad wild animals, etc. Though we do get some tornadoes in the
> summer, but usually they are far apart and cover a small area. A rather
> uneventful place to live. :)
>
> On 2/24/2011 9:09 PM, IVP wrote:
>  
>>>> New Orleans?
>>>>        
>>>>        
>>    
>>    
>>> I don't think New Orleans is a or previously volcanic region
>>>      
>>>      
>> No, I meant it was built in the wrong place - below sea level
>> in a region prone to severe flooding, like many inhabited places
>> around the world
>>
>> That said, Yellowstone might get it anyway ;-)
>>    
>>    

> As long as Lake Erie doesn't catch fire.
>
> Kerry
>
>
> Carl Denk wrote:
>    
>> That's what we like about Northern Ohio. We do get once a year or so,
>> light tremors, magnitude 1 is heavy. But no poisonous snakes or other
>> critters, bad wild animals, etc. Though we do get some tornadoes in the
>> summer, but usually they are far apart and cover a small area. A rather
>> uneventful place to live. :)
>>
>> On 2/24/2011 9:09 PM, IVP wrote:
>>
>>      
>>>>> New Orleans?
>>>>>
>>>>>
>>>>>            
>>>
>>>
>>>        
>>>> I don't think New Orleans is a or previously volcanic region
>>>>
>>>>
>>>>          
>>> No, I meant it was built in the wrong place - below sea level
>>> in a region prone to severe flooding, like many inhabited places
>>> around the world
>>>
>>> That said, Yellowstone might get it anyway ;-)
>>>
>>>
>>>        
>
>

>  IVP wrote:
>>
>> Christchurch is particularly prone to liquefaction during tremors
>> because of the underlying geology, and that allowed for more
>> damage than might have happened on solid ground
>>
>> www.guardian.co.uk/weather/2011/feb/23/new-zealand-christchurch-earthquake-geology
>>
>> On the surface of course it's a very nice place to live. Plains,
>> hills, harbours, rivers etc
>>
>
> I am not getting what's going on to South-West of Christchurch now:
>
> 3.3M, depth: 0km 28/2/2011 20:22
> http://www.christchurchquakemap.co.nz/
>
> Zero depth. Would the next be negative depth?
> No humor or sarcasm, just wondering what's that? How does that feel to
> be there? This seems to be the place where September quake line
> crosses latest quake line.

> About 7:42pm here, March 4th.
>
> Another estimated 5.x aftershock just hit a few minutes ago.
> The text message just received from my son indicates it wasn't bad enough to
> take out the phone systems. That's good.
> House OK he says.
> Ambulance sirens can be heard.
>
> Something like a war zone but different.
> A lot of people have left and many more are planning to.
>
> Without intending to detract in any way whatsoever from the Christchurch
> tragedy, I think it's worth noting that for every person killed in
> Christchurch to date in the recent quakes, there were between 400 to 1200
> deaths* in Haiti in their 2010 quake. Once disasters get above a certain
> size they get very hard for the mind to grasp unless intimately involved,
> and often not even then.
> (*Haiti death toll estimate varies very widely. From perhaps under 100,000
> to well over 300,000).

>
> On 06/03/2011 02:15, RussellMc wrote:
> > Presumably the people who actually know something about this are well ahead
> > of me on this, if there is any risk.
>
> Possibly, but I'm wondering what would there be to be done even if they
> are aware of it all?
> I don't really know anything about such things (fortunately in this
> country we have little need to) but your analysis seems quite plausible
> (to me at a quick read - not looked at any maps)
> I understand there is some benefit in predicting these things, but I
> imagine politics/economics will often be a large(r) factor in deciding
> what to actually do about them. I guess if you are going to do something
> like evacuate millions of people and give up (various levels of,
> depending on area) lucrative land then some pretty concrete evidence
> would be needed.
>

> Tsunami can be dealt with pretty much on an immediate coastal basis in
> most cases. MUCH more so than eg earthquake itself.
>
> Once you decide there is a prospect you can easily [tm] minimum quake
> to Tsunami arrival times and can have a moderately good idea of
> maximum wave amplitude and "reach".
>
> If probabilities were high enough you can easily put in monitoring for
> an actual wave and alarms. Once people are convinced this is serious
> they tend to cooperate reasonably well. Satellite and other aerial
> before and after photos of Bunda Aceh (which are available)(I have
> some somewhere) and photos of Samoa (many available) help convey
> conviction. The large majority in most possibly affected areas need
> only move very short distances taking only short times to be out of
> tsunami risk in most cases.
>
> Photos of Bunda Aceh give and extremely good idea of what is and isn't
> liable to provide protection and how far inland things can happen in
> certain locations.
>
>   A Tsunami is essentially a step change in incoming water velocity -
> NOT a normal wave. Once you see what they do and how they work you can
> have a fair idea what you need to do in a given case.
>
> Arrival time would need expert input. Open ocean velocities are v high
> (100-200 kph or even more) and amplitudes low, and speed drop and
> height rises as depth drops. There are std depth/height/speed formulae
> available. The Kaikoura trench is an anomaly. You have deep ocean
> depths in a slot with continental shelf either side. How that shapes
> and directs a wave and how fast/slow / high is utterly beyond me.
>
> 5 minutes warning should save most people affected.
> 2 minutes warning helps heaps if you are alert.
> In Samoa tens of seconds was enough for some.
>
>