MD-T chart in 北海道西方沖

MD-T chart in 北海道西方沖 (West offshore Hokkaido region) 

MD chart in 北海道西方沖

MD chart in 北海道西方沖 (West offshore Hokkaido region)  

Dragon chart in 北海道西方沖

Dragon chart in 北海道南西沖 (Southwest offshore Hokkaido region)  

Sum of Magnitude per 1day in 北海道西方沖

Area map of 北海道西方沖 (West offshore Hokkaido region)  is defined for epicenter's analysis as below,  

note : Horizontal axis isn't linear.

Distribution of Magnitude in 北海道西方沖

Distribution of Magnitude in 北海道西方沖 (West offshore Hokkaido region) 

Distribution of Depth in 北海道西方沖

Distribution of Depth in 北海道西方沖 (West offshore Hokkaido region) 

Area map of 北海道西方沖

Area map of 北海道西方沖 (West offshore Hokkaido region) is defined for epicenter's analysis as below,  

Counts of occurrence per depth in 北海道南西沖

Counts of occurrence per depth in 北海道南西沖 (Southwest offshore Hokkaido region)  is shown as below graph, 

According with the wider domino effect of depth range, the magnitudes become greater from M6.1 in 1950, M7.1 in 1982, and M8.3 in 1993.

10km (yellow)…This count of the earthquakes is the 1st one. 10km&20km curves has chased each other back and forth. Recently, 10km is more than 20km. There was a  rapid increase of 10km caused by M6.1 in 1950 after the longest silent term between 1929 - 1950. The 2nd step up was caused by M7.1 in 1983 after the 2nd longest silent term between 1967 - 1983. The 3rd step up was caused by M7.8 of 40km in 1993. The rapid increase of 10km after M7.8 was delayed from the ones of 40km/30km/20km/1km. It seems to show the domino effect of earthquakes of M7.8 should have been carried over from the epicenter of 40km to shallower depth. The max magnitude of 10km is M7.1 in 1983.

20km(orange)…This count was the 2nd overtaken by 10km recently. The 1st step up was caused by M6.1 of 10km in 1950 delayed from 10km after the 2nd longest silent term between 1930 - 1953 of 20km. The 2nd step up was caused by M7.1 of 10km in 1983 after the longest silent term between 1966 - 1983. The 3rd step up was was caused by M7.8 in 1993. M6.3 of 20km was also caused M7.8. This  M6.3 is the max magnitude of 20km.

30km(light green)…This count was the 3rd. After the longest silent term between 1942 - 1966, there were 2 long silent terms between 1966 - 1977 / 1977-1983. After them, there was the rapid increase of 30km in 1983 was caused by M7.1 of 10km. The 2nd increase was caused by M7.8 of 40km in 1993.  In result, 30km has overtaken 1km. The max magnitude of 30km is M6.0 in 1983 caused by M7.8. 

40km(green)…This count was the 4th. After the longest silent term between 1933 - 1967 , M7.8 was occurred in 1993 as the end period of 2nd longest silent term since 1967. The M7.8 in 1993 became the origin of domino effect from 40km to 1km. M7.1 of 10km in 1983 had the smaller domino effect from 30km to 1km. The difference from M7.1 to M7.8 seems to be the difference of the depth ranges, not only the one of the length of fault (The deeper cut should have the wider aperture area). M6.1 of 10km in 1950 had the further smaller domino effect from 10km to 1km. 

50km(light blue)…This count was the 5th. After long silent terms, only 2 earthquakes were occurred just after M7.8 of 40km in 1993 as 4th & 5th of the total count of 50km additionally.

Others … M6.4s were occurred of 240km in 1981 / of 250km in 1996 as outstanding ones.  

 

MD-T chart in 北海道南西沖

MD-T chart in 北海道南西沖 (Southwest offshore Hokkaido region)  

MD chart in 北海道南西沖

MD chart in 北海道南西沖 (Southwest offshore Hokkaido region) 

 

Dragon chart in 北海道南西沖

 Dragon chart in 北海道南西沖 (Southwest offshore Hokkaido region)  

Sum of Magnitude per 1day in 北海道南西沖

Sum of Magnitude per 1day  in 北海道南西沖 (Southwest offshore Hokkaido region) 

note : Horizontal axis isn't linear.
 

Distribution of Magnitude in 北海道南西沖

Distribution of Magnitude in 北海道南西沖 (Southwest offshore Hokkaido region) 

 

Distribution of Depth in 北海道南西沖

Distribution of Depth in 北海道南西沖 (Southwest offshore Hokkaido region)  

Area map of 北海道南西沖

 Area map of 北海道南西沖 (Southwest offshore Hokkaido region) is defined for epicenter's analysis as below, 

 

Counts of occurrence per depth in 根室地方南部

Counts of occurrence per depth in 根室地方南部 (South Nemuro region) is shown as below graph, 

1km (red)…This count of the earthquakes is the 1st one. All of them are unknown details (with no magnitude data). The increase stopped after the longest silent term between 1982 - 1994. 

10km…No occurrence.

20km(Orange)… Only once with no magnitude data in 1966.

30km…No occurrence. 

40km(green)… Only 3 earthquakes (8th). The max magnitude is M5.7 in 1928, and this is also the max in all depth. M5.7 was occurred after many unknown details of 1km.

50km(light blue) …This count was the 2nd. Since M5.6 in 1952, the count has been kept the 2nd. M5.6 is the 2nd strength in all depth.

60km(blue) …This count was the 7th less than 100km(6th). The max magnitude is M4.2 in 1973.   

70km (violet)…The count is the 3rd. 2000s and after, the curve chased each other with 90km. Though the count is higher than 90km, 70km stopped in 2022 earlier than 90km. The max magnitude is M4.1 in 1991/1994.  

80km (navy blue)…The count is the 5th. The max magnitude is M4.5 in 2012.  

90km (brown)…The count is the 4th. The max magnitude is M5.4 in 2018.

Others… omitted.

Only 1km has stood out from other depths. The most of earthquakes in this area may be occurred in 50-90km for a while. In 10-40km, there are only few earthquakes recently.　

MD-T chart in 根室地方南部

MD-T chart  in 根室地方南部 (South Nemuro region) 

 

MD chart in 根室地方南部

 MD chart in 根室地方南部 (South Nemuro region) 

Dragon chart in 根室地方南部

Dragon chart in 根室地方南部 (South Nemuro region)  

Sum of Magnitude per 1day in 根室地方南部

Sum of Magnitude per 1day in 根室地方南部 (South Nemuro region)  

note : Horizontal axis isn't linear. Data of epicenters of unknown details (with no magnitude data) are omitted to make the colors of depths clear.

Distribution of Magnitude in 根室地方南部

Distribution of Magnitude in 根室地方南部 (South Nemuro region) 

Distribution of Depth in 根室地方南部

Distribution of Depth in 根室地方南部 (South Nemuro region) 

Area map of 根室地方南部

Area map of 根室地方南部 (South Nemuro region) is defined for epicenter's analysis as below,  

 

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.

MD-T chart in 根室地方中部

MD-T chart in 根室地方中部 (Middle Nemuro region)

 

MD chart in 根室地方中部

MD chart in 根室地方中部 (Middle Nemuro region) 

Dragon chart in 根室地方中部

Dragon chart in 根室地方中部 (Middle Nemuro region)

 

Sum of Magnitude per 1day in 根室地方中部

 Sum of Magnitude per 1day in 根室地方中部 (Middle Nemuro region)

note : Horizontal axis isn't linear.

Distribution of Magnitude in 根室地方中部

Distribution of Magnitude in 根室地方中部 (Middle Nemuro region) 

 

Distribution of Depth in 根室地方中部

Distribution of Depth in 根室地方中部 (Middle Nemuro region)

 

Area map of 根室地方中部

Area map of 根室地方中部 (Middle Nemuro region) is defined for epicenter's analysis as below,  

Counts of occurrence per depth in 根室地方北部

Counts of occurrence per depth in 根室地方北部 (North Nemuro region) is shown as below graph,  

• 1km (red)…This count of the earthquakes is the 1st one. There was a continuing earthquakes in 2004. But , there was no major earthquake except M4.8. This M4.8 is the max magnitude in 1km. Before these earthquakes, there was the longest silent term between 1964-2002. The curve is still glowing actively. 
• 10km (yellow)…This count is the 2nd. The curve was overtook by 1km's continuing earthquakes in 2004. Before it, there were the 1st & 2nd longest silent terms except 1919-1931 (no earthquake record of 10km). These terms overlapped with the one of 1km. The max magnitude of 10km is M5.3 in 1963.
• 120km/130km/140km(gray)…These counts are the 3rd. The each max magnitude is M5.1 in 1955 & in 2006/M5.8 in 2007/M4.8 in 1967. The max magnitude for all depths is M6.1 of 160km. 160km has only 2 times earthquakes.
• Others… omitted.

MD-T chart in 根室地方北部

MD-T chart in 根室地方北部 (North Nemuro region)  

 

MD chart in 根室地方北部

MD chart in 根室地方北部 (North Nemuro region) 

Dragon chart in 根室地方北部

Dragon chart in 根室地方北部 (North Nemuro region) 

Sum of Magnitude per 1day in 根室地方北部

Sum of Magnitude per 1day in 根室地方北部 (North Nemuro region) 

note : Horizontal axis isn't linear.

Distribution of Magnitude in 根室地方北部

Distribution of Magnitude in 根室地方北部 (North Nemuro region) 

Distribution of Depth in 根室地方北部

Distribution of Depth in 根室地方北部 (North Nemuro region)  

Area map of 根室地方北部

 Area map of 根室地方北部 (North Nemuro region) is defined for epicenter's analysis as below, 

Counts of occurrence per depth in 釧路地方中南部

Counts of occurrence per depth in 釧路地方中南部 (Central Southern Kushiro region)  is shown as below graph, 

1km (red)…This count of the earthquakes is the 1st one. Most of them are the unknown details (with no data of magnitude) in 1919-1994. The ratio is 602/733=82%, all of them except 5 times in 1994 was occurred in 1919-1980, and there was the longest silent term between 1980-1994 (14 years).  After one more long silent term in 1994-2002, the counts has start gradual increasing again. The max magnitude is M6.1 in 1938.

50km(light blue) …The count is the 2nd. 2 times of M7 made it increase rapidly. One was M7.2 in 1961, and other was M7.2 in 2004. 

60km(blue)…The count is the 3rd as same as 90km/100km. These concentration of curves may mean the sign of some big earthquake around 50km or so on.

90km(brown)…The count is also the 3rd. The curve caught up in 2023, and has stopped the increase. The max magnitude is M6.3 in 1953. 

100km(gray)…The count is also the 3rd. M7.5 in 1993 made it increase rapidly. The curve overtook 50km at one time between 1996-2004. It seems that M7.5 of 100km in 1993 spread to M7.1 of 50km in 2004. The last occurrence was Sep/2024. The max magnitude is M6.3 in 1953.

10km(yellow)…The count is the 6th. The count increased by M6.3 in 1953, and overtook 50km's curve. Since then, these curves chased each other until 1977. The max magnitude is M6.5 in 1967.

80km …The count is also the 6th. The max magnitude is M6.0 in 1928. Since then, there has increased gradually.

120km/110km(gray)…The count is the 8th/9th. Since about 1961, these curves were twisting.  The each max magnitude is M6.3 in 1999/M5.8 in 1944. The bigger max magnitude, the count may increase more in the end. So, 110km may overtake 120km soon.

40km(green)…The count is the 10th. On addition to it, the last occurrence was in 2012. The max magnitude is M5.4 in 1987. 

70km(purple)…The count is the 11th. The max magnitude is M6.3 in 1927.

130km(gray)…The count is the 12th. The max magnitude is M5.8 in 2007.

30km(yellow green)…The count is the 13th. The max magnitude is M6.1 in 1959.The count should become higher. It will become higher in future.

20km(orange)…The count is the 14th. The max magnitude is M5.7 in 1967. The count may become higher in future.