Counts of occurrence per depth in 愛知県・三河湾・伊勢湾

Counts of occurrence per depth in 愛知県・三河湾・伊勢湾 (Aichi Pref., Mikawa Gulf & Ise Gulf )  is shown as below graph,

During the longest silent term of 1km since 2006, 1km curve was overtaken by 10km curve. The count of 1km-20km had each rapid increase in 1945 caused by M6.4 of 10km in 1945. 40km curve began to leave from 30km curve around 1974 because of the far long silent terms of 30km. Furthermore, there was the acceleration of 40km by M6.1 of itself. 50km is following behind 40km curve, and may catch up with 30km curve soon.  

• 1km (red)…The count is the 2nd. the count was increasing steadily until 1944 and keeping the 1st. Between 1944-1945, there was a rapid increase of 1km affected by M6.8 of 10km. The 1km rapid count increase was between 163-182 in 1944/between 185-304 in 1945. The longest silent term is extending since 2006. The 2nd/3rd longest silent terms are between 1985-1994(count as 516-518)/between 1996-2004(count as 520-521). The largest one of 1km is M5.9 in 1946(count as 370). 
• 10km(yellow)⋯The count is the 1st. 10km curve was following behind 1km curve. As the increase of 1km had stopped since 2006, 10km curve overtook 1km curve in 2023. There was a rapid increase(count as 33-129) of 10km caused by M6.4 of 10km in 1945 similar to the 1km curve. The M6.4 is the greatest one of all depths.
• 20km(orange)⋯The count is the 4th. 20km curve was following behind 1km curve similar to 10km curve. Less rapid increase than 10km made 20km leave from 10km curve by the M6.4 of 10km. Furthermore, 20km curve was overtaknen by 40km curve in 2006(count as 176). The largest one of 20km is M6.0 in 1997.
• 40km(green)⋯The count is the 3rd. 40km curve was following behind 20km curve, and made leave from 20km curve once by the rapid count increase of 20km in 1945. But, 40km curve was accelerated by the 3rd longest silent term between 1976-1981 (count as 86-87), and also the M6.1 of 40km in 1997(count as 120). 40km curve overtook 20km in 2006. The largest one of 40km is M6.1 in 1971.
• 30km(yellow green)⋯The count is the 5th. 30km/40km curves were chasing and being chased to each other until around 1970.  There were the 2nd/1st longest silent terms between 1973-1980(count as 67-68)/1986-1998(count as 74-75). The M6.1 of 40km was occurred in 1997 around the end period of the 1st longest term of 30km. The count of 30km was accelerated by the M6.1 of 40km. The largest one of 30km is M5.5 in 1939.
• 50km(light blue)⋯The count is the 6th. After the 2nd/1st longest silent terms between 1919-1925/1925-1932 continuously, 50km curve is increasing almost steadily. There was the 3rd longest silent term between 1954-1960. After the 3rd one, 50km was accelerated slightly, and became closer to 30km curve. The largest one of M5.4 in 1989.
• others⋯omitted. There was M6.0 of 370km in 1970.