Counts of occurrence per depth in 秋田県沿岸北部(Northern coast of Akita Pref.) is shown as below graph,
- 1km (red)…The count is the 3rd. There is the rapid increase after M6.8 of 1km in 1939 after the longest silent term between 1919-1939. Then, the silent terms became longer suddenly. The 2nd longest silent term is continuing since 1997. The M6.8 in 1939 is the greatest one of all depths.
- 10km (yellow)…The count is the 1st. As same as 1km, there is the rapid increase after M6.8 of 1km in 1939. Then, the silent terms became longer suddenly. The longest silent term is between 1957-1995. After it, the count increased with steep sloop. During stop of 1km, 10km curve overtook it. The largest of 10km is M5.0 in 1939.
- 20km(orange)… The count is the 2nd. As same as 1km/10km, there is the rapid increase after M6.8 of 1km in 1939. Then, the silent terms became longer suddenly. The longest silent term is between 1959-1998. After it, the count increased with steep sloop. During stop of 1km, 20km curve overtook it, and stopped when 20km curve caught up with 10km curve. The largest of 20km is M6.5 in 1939.
- others… Remaining counts except 1km-20km are only 8%.
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