Counts of occurrence per depth in 根室地方中部

Counts of occurrence per depth in 根室地方中部 (Middle Nemuro region) is shown as below graph, 

• 1km (red)…This count of the earthquakes is the 1st one. The increase continued until 1964, then the silent term became longer. The longest one is abut 33 years between 1976-2009. It seems the one of the sign of Great East Japan Earthquake in 2011. The last occurrence was about 4 years go in 2021. The rapid increase may be occurred in the not too distant future. The max magnitude is M5.1 in 1924.
• 80km (navy blue)…This count was the 2nd. Though the curves of 80km/90km are twisting, the count has become higher because of 90km's stop in Feb/2024. But, 80km/90km curves may overtake 1km in the not too distant future. The max magnitude is M4.2 in 1961/1973.
• 90km (brown)…This count was the 3rd. The longest silent term is between 1919-1956. The long silent terms repeated and became shorter and shorter until 2016. Then, the continuous earthquakes was occurred in 2016, and the count increased rapidly. After it, the silent term became longer as between 2017 - 2024. While this long silent term, 80km curve has overtaken 90km. The max magnitude is M4.1 in 1991.
• 70km (violet)…This count is the 4th. Between 1971-2015, the count was larger than 70km/80km. But, 90km increased rapidly in 2016. On addition to it, 70km had the long silent term between 2015-2022. In result, 70km was also overtaken by 80km. The max magnitude is M5.0 in 1930.
• 120km(gray)…The count is the 5th. After the long silent term between 1995 - 2006, the sequential earthquakes were occurred since 2006. Once, the curve overlapped with 90km. But, the increase has stopped in 2021.  The max magnitude is twice M5.1 in 1995/2006.
• 10km(yellow)…The count is the 6th. There was the 2nd longest silent term between 1978 - 1999 (The 1st is between 1919 - 1952). After them, the increase stopped in 2009 after overtaken by 120km. The max magnitude is M5.3 in 1963.  
  
• 50km(light blue)…The count is the 6th as same as 10km. After the rapid increase, the count has stopped since 1965. The max magnitude is M5.6 in 1952.  
  
• 100km(gray) …The count is the 6th as same as 10km/50km. The count has stopped since 2022. The max magnitude is M5.4 in 1954.
• 130km(gray)…The count is the 9th. The max magnitude is M5.8 in 2007. M5.8 is the 2nd largest earthquake in all depth.
• 40km(green)…The count is the 10th. The curve approached to 10km's curve. But, the increase stopped in 1973. The max magnitude is M5.2 in 1932. 
  
• 110km/140km (gray) …The counts are the 10th as same as 40km. The curve patterns are very similar with each other.
• 30km(light green)…The count is the 13th. The curve patterns are very similar with 40km's curve. The increase stopped in 1978. The max magnitude is M4.4 in 1944.
• 20km(orange)…The count is the 14th (only 4 times of earthquakes).  The increase stopped in 1978. . The max magnitude is M4.2 in 1954.
• 230km(gray) …The count is the 16th as same as 60km / 160km / 170km / 260km. The max magnitude is M6.2 in 1924, and it is also the largest in all depths.
• Others… omitted.