(redefined rectangle area of Ishikari,Sorachi,Shiribetsu region)
There are discontinuous graph lines because of data of "Unknown details" with no Magnitude data in both 70km and 100km depth.
The slope of the line between 40km/50km is almost 1.0. The slope of the line among 140km/160km/170km/180km is almost 1.0 also.
M6.7(40km) on the line between 40km/50km was 2018 Hokkaido Eastern Iburi Earthquake "北海道胆振東部地震" in 2019/2/21 (37km).
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