Sum of Magnitude per 1day in 長野県北部

Sum of Magnitude per 1day in 長野県北部（Northern Nagano Pref.）

note : Horizontal axis isn't linear. Most of date are skipped as the horizontal label. All "unknown" data are plotted with no peak because of no magnitude data. So, most of the data of "Matsushiro Earthquake Swarm" since 1965 have no peak.