a reply to: pheonix358
The project is only covering earthquakes over M6.5
The reason is we are talking about Kilo Tons (KT), not Tons like I do for NZ and Japan i.e. 1KiloTon = 1000Tons
So anything below M6.5 is insignificant in relation to the overall energy release if there are some big M8's that year.
For example I just did 2014 using ANSS data. I have now set the base number to 239,006 KT, which is equal to a M8.8. M9.0 is too big a number and the
yearly segments are too small. 8.8 should be a reasonable base, producing only 7 full circles in the 1700 year period.
When I downloaded the ANSS data I grabbed the M6.0-6.5 range too (98 of them), to see what % they make up, its only 2,621KT. About the same as a quiet
year of M6.5-7.0's.
The cheese wheel below shows what proportion the M6.0-6.5 range is in comparison to the other bigger magnitudes combined, and the whole segment in
relation to a full wheel which would be 239,006 KT.
If I included M5's as well it wouldn't make much difference.
Apologies to all those killed in quakes below M6.5, there have been thousands died in such events over the years, in places like Iran and China, even
NZ (Christchurch 2011) due to old or poorly constructed building collapses. I am not saying quakes less than M6.5 are not significant, but my map part
on each page would be saturated with icons if I did include them. Even dropping below M7.0 has casued me a lot of extra work on the files.
What is interesting, is in all the 1700 years worth of data there has never been a M8.9 (well not a 8.9Mw anyway)
As an experiment I have done the first 2 days of June for NZ using the same cheese wheel, but for NZ the scale is TTNT.
Looking over the daily TTNT for May I have set the base for NZ at 477TTNT, which is equal to a M5.0.
As it happensyesterday there was a 5.04 at the Kermadec Islands, so straight away we got a full circle. I tried a few things and came up with this
idea. Show the extra TTNT over the 447 base as a segment with the "over 447" showing as a + figure.
I will try that with the M6.5+ project and see what comes out.
Below are the 2 days of June, these show individually on the relevant NZ pages
edit on 0600000015315315 by muzzy because: (no reason given)
I just processed M5.0-6.0 data from ANSS for 2014, 1568 events, comes to 2737 KT, so again not going to make that much difference to the cheese
wheels. And anything below M5.0 isn't going to be valid, as ANSS don't pick up all M4's.
edit on 0600000015315315 by muzzy because: (no reason