Counts of occurrence per depth in 石川県能登地方

Counts of occurrence per depth in 石川県能登地方（Noto region, Ishikawa Pref.）is shown as below graph,  

Before M6.9 of 10km in 2007, the count of 1km curve kept the 1st even though there was the longest silent term between 1955-1990.  There were the major rapid increases in 2007/in 2024 caused by M6.9 of 10km/M7.6 of 20km. These increases seems to try catching up with the advanced count level in past. 10km curve increased until the delayed 1km curve with the longest silent terms or so on until just before the M6.9 in 2007. 1km curve followed behind 10km curve with the 3rd longest silent term, and increased rapidly until the count level becoming almost same count level of 10km in 2007. 20km curve also followed behind 1km curve until the count level becoming almost same count level of 1km in 2007. The largest one of 1km is only M4.8 aginst M6.9 of 10km/M7.6 of 20km. These larger magnitudes of 10km/20km should be transmitted to 1km someday in futute, and the count should become the 1st again.

• 10km (yellow)…The count is the 1st. 10km curve was following behind 1km curve before M6.9 of 10km in 2007. There was the rapid increase of both 10km/1km M6.9 of 10km in 2007, and 10km overtook 1km far away.  10km curve's slope became gentler after it once. But, around 2020, it became steeper  again by M7.6 Noto Peninsula Earthquake of 20km in 2024.  As shown in the above graph,  M6.5 /M6.1 /M6.0 of 10km were occurred continuosly in 2024 as the aftershocks of the M7.6  later.  The M6.9 of 10km is the largest one of 10km.
• 1km(red)⋯The count is the 2nd. Though the count of 1km curve was the 1st before the M7.6 of 10km, there were the longest silent terms of the 1st/2nd/5th/4th of 1km before the M7.6. The M7.6 was occurred just after the count of 10km overtook one's of 1km as count 26 of 10km. After the 3rd longest silent term of 1km between 2008-2023, there was the rapid increase of 10km/1km/20km caused by the M7.6 in 2024. The silent term of 1km became over 3 months after the M7.6 of 20km in 2024 as count.396. The one of 10km had become over 3 months at first after the M6.9 of 10 km as count 397. Both rapid increases end seems to be very similar.  The largest one of 1km is M4.8 in 2024. It may be too small againt both ones of 10km(M6.9)/20km(M7.6). Someday in future, there should be occurred M7 or so on, and the count should get back the 1st count of all depths.
• 20km(orange)⋯The count is the 3rd. 20km curve was following behind 1km curve as same as 10km curve. As there was the longest silent term of 20km between 1938-1985,  the distances from 1km/10km wouldn't become closer so easy.  There was no rapid increase of 20km in 2007 different from 10km/1km curves. But, there was the rapid increase of 20km caused by the M7.6 of 10km in 2024. The count of 20km was 57 times when the silent terms taking over 3 months at first since the occurrence.  The count 57 is also the last occurrence of 20km. The count of 57 is almost same as the count 53  of 1km when the silent terms taking over 3 months since the occurrence of the M6.9 of 10km in 2007.  But, after the M6.9, 10km/1km counts increased more by far. So, the distances are still far from 20km curve. The largest one of 20km is M7.6 in 2024 named as "Noto Peninsula Earthquake". It is the greatest one of all depths.
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