Sum of Magnitude per 1day in 釧路地方中南部

Sum of Magnitude per 1day in 釧路地方中南部
 (redefined rectangle area of Central Southern Kushiro region) 

note : Horizontal axis isn't linear. Data of epicenters of unknown details (with no magnitude data) are omitted to make the colors of depths clear. The max magnitude is M7.5 of 100km depth of Kushio-oki in 1993/1/15. M7.1 of 50km depth of Kushiro-oki (called Kushiro-oki Earthquake) in 2004/11/29 made the peak of Sum of Magnitude of 50km(light blue).