Distribution of Magnitude in 長野県北部（Northern Nagano Pref.）is as below,
As the most of "Matsushiro Earthquake Swarm" since 1965 are recorded as "unknown" with no magnitude data, they are not included in the below graph. The peak around ln M=0.6 (M=2.6) is consisted mainly by the data after 2011 induced by M9.0 Great East Japan Earthquake.
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