Counts of occurrence per depth in 三重県北部・滋賀県

Counts of occurrence per depth in 三重県北部・滋賀県（Northern Mie Pref. and Shiga Pref.）is shown as below graph,

Though there were some out of order, the counts of shallower depths become more.  M7.9 Showa Tonankai earthquake in 1944 outside of this area affected  as some rapid increases.

• 1km(red)…The count is the 2nd. There had been a steady increase until 1943, and there was a rapid increases between 1944-1945 induced by M7.9 Showa Tonankai earthquake in 1944 outside of this area (count as 134-180).  The largest one of 1km is M5.4 in 1950 (count as 247).
• 10km(yellow)…The count is the 1st. 10km curve was following behind 1km curve. The count was accelerated around M5.5 of 10km in 1998 (count as 181). 10km curve overtook 1km curve (count as 306). The largest one of 10km is M5.5 in 1998 (count as 181).
• 20km(orange)…The count is the 3rd. 20km curve has been following behind 10km curve. The 2nd longest silent term was between 1938-1944 (count as 9-10). There was a rapid increase caused by M7.9 Showa Tonankai earthquake in 1944. After that, the count has been increasing steadily. The largest one of 20km is M5.4 in 2007 (count as 138).
• 30km(yellow green)⋯The count is the 6th. 30km curve was following behind 40km curve. But, it coudn't be achieved. The count stopped in 2000 (count as 19). So, 30km curve was overtaken by 50km curve. The largest one of 30km is M5.5 in 1939 (count as 5).
• 40km(green)…The count is the 4th.40km curve was following behind 10km curve also. But, the frequency was less than 20km's one. So, 40km curve was overtaken by 20km curve in 1944 (count as 10). The largest one of 40km is M5.6 in 1925 (count as 3).
• 50km(green)…The count is the 5th.50km curve was following behind 30km curve , and overtook it. The largest one of 50km is M4.9 in 1962 (count as 6).
• 420km⋯The greatest one of all depths is M6.7 in 1925.
• others⋯omitted.