Area map of 長野県北部（Northern Nagano Pref.）is defined for epicenter's analysis as below,
There was "Matsushiro Earthquake Swarm" since 1965. The number of only felt earthquakes reached more than 60kp between 1965-1968. There are only 1000 data plots until middle of Oct/1965.
The below area map of 長野県北部（Northern Nagano Pref.）is also plotted only 1000 data between 1980 - Sep/2011 or so on. Even though there is no main part of "Matsushiro Earthquake Swarm", the blank area of Southernwest Nagano Pref. was covered with new ones.
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