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Originally posted by PuterMan
reply to post by bkaust
yeah, I've read up about that one too, I was surprised when I first hear about it! you dont think 'volcano' when you hear Victoria!
I don't think volcano when I hear Australia, let alone Victoria! In fact today I have been enlightened.
So, when is it gonna blow then?
It was interesting that the theories which have been accepted so widely are based on so little fact and KNOWN conflicting information. I don't know how text books can outwardly state that the Pangea theory is how it all happened....and without so much as an explanation to why they came to that conclusion. I'm annoyed now.
Originally posted by JustMike
reply to post by SunDawg
Now here's a link to the same database and for the same mag range, but for the 20-year period from Nov 10, 1990 to Nov 9 2010:
Quakes mag 5-plus, past 20 years.
There were 31,486 in that time, which works out at 31,486/20 = 1574 per year.
So actually, the number of quakes of mag 5-plus in the past 12 months is a bit down on the longer-term average.
Originally posted by zenius
reply to post by bkaust
Apparently there was a tremor in Queensland in the last week. I missed that one. Anyone know where it was centred?
The resulting round-off error occasionally leads to differences of 0.1 in the estimates of moment magnitude released by different groups
Worldwide earthquakes with M4.5+ located by USGS and Contributing Agencies.
(Earthquakes with M2.5+ within the United States and adjacent areas.)
We locate and report on all earthquakes world wide of magnitude 5.0 and larger in one hour or less if possible. We do not locate earthquakes smaller than 4.0 outside the US unless they have caused significant damage. Earthquakes this small very rarely cause any damage at all.
Earthquakes smaller than 5.0 down to magnitude 4.0 are located as we have time and if we have enough data to locate them, regardless of where in the world they occur. Earthquakes occurring outside the US and smaller
than about magnitude 4.5 are difficult for the USGS to locate if there is not enough data. Most of the time there is not. Most of the aftershocks still occurring from the large New Zealand earthquake are in the low 4.0+ magnitude
range and therefore difficult for us to locate without data.
The magnitudes posted by the New Zealand web sites may be higher than ours due to different sets and amounts of data. Even though the New Zealand website locates an earthquake and reports a magnitude larger than 4.5 does not mean we have enough data to locate it or compute the same magnitude. Nor does it mean that our data will indicate it is larger than 5.0. The scientists in New Zealand have access to 100's of more earthquakes stations there than we have access to and are therefore able to locate many more of the smaller earthquakes than we are able to. For aftershocks smaller than about 4.5 we must wait for data to be sent to us from New Zealand. Data is not sent to us in real time or even on a daily basis.
If we don't have the event located, then we did not get/see the felt reports. Anything under mag 5.0 and above 4.0 we locate only if we are able and if we have enough data to locate it. If our systems do not locate it automatically, then we won't know it happened until we get local data.
One of the analysts did check and this earthquake is in our system. It looks like the WEL data for it has come in but we did not locate it ourselves. The IDC location puts it at about 4.6 which is still probably a little high. Because of this magnitude and the fact we didn't locate it in the first place, it most likely won't get located until it is in review for the PDE.