Distribution of Magnitude in 釧路地方中南部

 Distribution of Magnitude in 釧路地方中南部
 (redefined rectangle area of Central Southern Kushiro region) 

M<1.0 (ln Mg<0) often occurs around volcanoes. In this case, 2 epicenters of M0.8 / M0.9 are located around Atosanupuri volcano (See MD chart about the location).