How awful. Thanks for the advice, Prawn. I'm a bit puzzled by the statement in the news report that it was far worse than the 7.1 quake that happened originally. This one was 6.3. Maybe its location.
It must be frightening there. Another 6 tremors between 3.5 and 4.3, a couple only 5 to 6 km deep.
This seems a lot of aftershocks in close succession or is the big one still coming?
Was there any public warning of an increased tremor?
Earthquakes are not like cyclones or floods. There is no advance notice. That's why they are so frightening.
Just checked through the data on that site and apparently there has been 79 tremors in the last week. A quick observation seems to show a steady increase in the (M)agnitute from 2.5ish to more over 3 in the last day or two.
Was there any public warning of an increased tremor?
PS: Another one of 4.6M, 5km deep @ 18.59
I believe many low magnitude tremors are not noticable, so what level is noticable, above 3 at those shallow depths must make a little rattle of the shelves mustn't it?
I 'm not a seismologist, but I believe they can estimate or at least take a pretty good calculated guess at the likelyhood of a significant quake based on tremor patterns among other things.
I just scrolled back 7 days seismic activity on the site above and there seemed to be a clear uptrend in the intensity of the tremors from 2.5 to the 3 to 4 range, particularly in the last couple of days.
Since we were told there was the likelyhood of another significant quake after last years quake, I'm curious what information or warnings if any were provided to the public... eg. did the media or gov have a commentry like the weather map, about tremor levels and trends?
I 'm not a seismologist, but I believe they can estimate or at least take a pretty good calculated guess at the likelyhood of a significant quake based on tremor patterns among other things.
Looking at the extremely localised incidence of those tremors at the end of the fault line leading directly to a long extinct volcano ( Banks Peninusula) makes you wonder what's going on down below?
And what if "they" could "guess" that there was the likelihood of an earthquake in Christchurch, what could they do about it. Everyone living on a major faultline knows that sooner or later there will be a major temblor. In San Francisco it's not a matter of if, but when, and no one knows. The seismologists can only "guess."
Apart from abandoning the city all the residents can do is what they do in Japan...build earthquake resistant buildings.
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