Analysis of M6.6+ in Hyuga Nada(日向灘) including both #SP12-2&#SP12-12 of (macro-analysis)

 [Summary] 

There are 2 special earthquakes of the 12 Singularities (#SP12-2&#SP12-12) in Hyuga Nada. For the macro analysis of them, I have syudied about M6.6+ in Hyuga Nada based on downloaded data (1919～Jan.2026) from JMA Seismic Intensity Database. The analysis showed not only  the counterclockwise loop of earthquakes similar with Case 1 (壱岐・隠岐) or Case 2 (the 12 Singularities), but also clockwise loop after the turning point. The study showed the possiility of the next M7+ as the closing point of the M7 loop around #SP12-2 on the exteded line from #SP12-12.  The next M7+ might become the trigger of Nankai Trough earthquake as M8+.

[macro-analysis] 

M7+ in Hyuga Nada area is shown as the circles inside of blue rectangular in the figure (downloaded from JMA) as below, 

The listed earthquakes of M7+ are listed with the data of the "date/time/seismic intensity/rounded longitude(E)/rounded latitude(N)/depth/ Number of Stage of M/M/elongitude(E)/rounded latitude(N)"  as the below list. The series numbers (#) are given to them as HG7-1 ～ HG7-6 (old～new). Orange colored one is M7 of #SP12-2 (HG7-3), and yellow colored one is M7.1 of #SP12-12(HG7-6). 

The 6 of M7+ in Hyuga Nada are plotted on the chart of Lng ve Lat of epicenters with the labels of each Magnitude as below,

M7 of #SP12-2 (HG7-3) is plotted as orange dot, and M7.1 of #SP12-12(HG7-6) is plotted as yellow dot. The loop of M7+ is counterclockwise(CCW) as similar with Case 1 (壱岐・隠岐) or Case 2 (the 12 Singularities),  but the loop hasn't closed. 

Characteristic of M7+ on the loop

The loop started with M7.1(HG7-1) as counterclockwise(CCW), and moved to M7.2 towards to NNE. Then, it went back with the sharp angle to M7 (#SP12-2) with CW. The next line from it to M7.5(HG7-4) formed the closed a smal closed triangle area. The red line (Southeast side) is almost parallel with the another red line (Northwest side) betweem M7.1 (HG7-5)/M7.1(#SP12-12/HG7-6). In fact, the SE side red line was drawn as the parallel line with the NW red line as the copy.   Each red line includes one of the 12 Singularities (#SP12-2/#SP12-12). 

The correlation of SE red line with HG7-1/HG7-3/HG7-4

 Please see the chart as below,

The correlation coefficient(R2) beteen the Lng(E) and Lat(N) is 0.9991 (very high value). Furthermore, there are higher R2 beteen Lng(E)/Lat(N) and M as 0.9999 /0.9996. It means the  size of these M7+ on the line are almost specified perfectly on the location of the Lng(E)/Lat(N).  

As shown with the descripions so far,  earthquakes occurrences of these should be not random ones, but  be with the predestined harmony.

Characteristic of M7+ on the loop

For the additional data, I picked up M6.6+ in Hyuga Nada (日向灘). 

The new list is as below, 

(The serial numers are updated as ##1～##13.)

The loop started with M7.1(##1) with blue lable of M6.9 as counterclockwise(CCW). The lines until M7.5(##5) with blue label are formed the small closed triangle area with sharp edges. The CCW loop continued until M6.7(##6) with yellow label. Then, the loop chnge the turning direction from CCW to CW. The new loop with CW has contined until to the end point of M6.6(##13).  

For the seeking the root cause of the turning on M6.7(##6), I added the correlation red lines with high R2 (0.9942～1) on the above figure as below,

3 red correlation lines are focuced on M6.7(yellow label) with red label. It means M6.7 is the focuced point of stress from different directions, and also the tough node common with differrent lines of big earthquake occurrences. So, I guessed the turning should have occurred on this tough point from CCW to CW.

Next, I would like to focus on the 2 red solid lines.

The red solid line with negative slope includes 4 points as correlation line with high R2 (Other lines have the high R2 among only 3 points). As explained, this line includes 2 points of the 12 Singularities (M7#SP12-2: orange dot and M7.1#SP12-12: yellow dot). Thease singularities are also the start point and the end point of the M7+loop in Hyuga Nada(日向灘). If the M7+ loop extend from M7.1#SP12-12 to(or over) M7#SP12-2, the huge closed loop will be formed, and will might mean the separation from the base plate. In result, a huge earthquake should occurr similar with "茂木ドーナツ（Mogi's Donut）" effect. 

The high R2 correlation line includng 2 singularities makes the possibility higher greatly. 

Another red solid line, with positive slope, has the perfect R2 among ##1/##5/##8 as 1. Similar with the high R2 correlation line among the M7+ plots, another high correlations there are. But, the high R2 are not between Lng/Lat vs M, but between Lng/Lat vs depth among  M7.1(HG7-1)/M7(HG7-3)/M7.5(HG7-4) in M7+ loop. 

It means Ms of the grids on the perfect correlation line shoud be fixred not only by the Lng(E)/Lat(N), but also the depth fatefully.

As dicussed above, there are multi high R2 correlation lines in Hyuga Nada. They restrict the epicenters position/M/the turning directions(CCW or CW), and seems to be never random ones.

Estimation of next M7+

In the case of the M7+ loop closing by the next M7+,  the estimated M might could be calcutated as below,

Ｍmax(N=7)=real max value (M7.5)＋log10(chain reaction lines number:7)/1.5

　　　            =7.5＋log10(7)/10≒8.1

(Based on several hypothesis as belows,

  * The released energy might be the same as all charged including the closed area, and be the total of all high R2 correlation lines which had the same energy with M7.5 (real max value in Hyuga Nada). The idea is similar with "茂木ドーナツ（Mogi's Donut)" theory.  )  

Caution

If N=6/N=5, the estimated value becomes around M8.0 anyway. But,I coudn't fix the occurrence date. So, I'm not sure if it could be tomorrow or 100 years later, or so on.