Talk:Japan Meteorological Agency seismic intensity scale

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my source for the ground accelleration [1] doesnt separate the 5 and 6 upper and lower levels, so I have estimated with a geometric mean Zeimusu

Why does japan have their own scale? How come they developed it from the beginning? Moberg (talk) 21:08, 27 May 2008 (UTC)

JSA <--> Seismic scale Conversion[edit]

It is possible someone can update that chart to include the Equivalent Seismic scale numbers? I'd do it but I can not find the information. Mkrupnic (talk) 15:59, 23 July 2008 (UTC)

It seems to me that the JMA scale is one for measuring the damage, not necessarily the actual power of an earthquake, unlike the seismic scales. I believe that a good analogue would be the Fujita scale used to rank tornados in comparison to the actual ind-speed inside the tornado itself. There is a distinct difference between a JMA 7 that has a richter scale of 8 and a JMA 7 that has a richter scale of 9. Anyone? Jtodsen (talk) 16:26, 11 March 2011 (UTC)
If you go to the JMA Website, and look at daily records of earthquakes, you will see that while it is likely that a stronger earthquake, will have more intense results over a wider area, there is no direct correlation between the two types of scale. One deals with the actual intensity of the earthquake, the other deals with its consequences in areas where it has been felt. To bring the problem home further, there are (as here) situations where the intensity of shaking is stronger at some stations further away from the epicentre of the earthquake. In this case, when you zoom in, while close to the epicentre, you are finding stations recording 2s and 3s, further away there are three stations recording 4s. There are too many factors involved to make any direct correlation easy. You see something similar, here. Kuitan (talk) 18:32, 5 February 2016 (UTC)

 Official term?[edit]

Is "Shindo" the ACTUAL, OFFICIAL name used for the scale in English? Because in Japanese it's used as a generic term for magnitude or intensity, in fact the JMA page linked to as a source seems to translate 震度 directly into "intensity". And if you look at the Japanese wiki page for 震度, it contains the JMA scale, the Mercalli scale, MSK scale, EMS scale, Rossi-Forel scale, all of them using 震度. All signs seem to point to "intensity" as a measure in the JMA scale, with no special "shindo" term necessary in English. Identity0 (talk) 03:47, 15 August 2008 (UTC) Italic text — Preceding unsigned comment added by (talk) 04:40, 25 September 2012 (UTC)

On their English language site, the Japanese Meteorological Association when measuring seismic intensity talk of JMA Seismic Intensity. They have produced a PDF download in English that is available on their website [2] . Kuitan (talk) 18:38, 5 February 2016 (UTC)

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