Analysis for the line chart of epicenter(Lat/Lng)-2

For the analysis of Noto Peninsula Earthquake(M7.6) in 2024/1/1, the time series graph of the epicenter(Lng) in Noto-pen.Area (1919/1-2025/1) is as below, 

The first graph is all data in the area.

The next graph is only 1km epicenter.

1km graph shows the graph pattern change more clearly.Earthquake swarm in 2007 was caused by M6.9 in Noto Offsure.After long silent term,the epicenter' s Longitude moved near to East side once. Then they returned to West side again and M6.9 was occurred. M6.9 is the second scale in all data of Noto-pen. Area. M7.6 in 2024 is the largest one in this Area.

Before M7.6(Noto Peninsula Earthquake), the abnormal earthquake swarm has started since around Aug/2021.But, in the graph with only 1km data, there had been the longest silent term exists just after M7.6.The term was broken only after  14 minutes from M7.6.

The time series graph of the epicenter(Lat) in Noto-pen. Area (1919/1-2025/1) as below, 

The first graph is all data in the area.

The next graph is only 1km epicenter(Lat).

* All data was downloaded from the site of Japan Meteorological Agency. I have arranged the data into graphs.M7.6 was occurred in land area as Noto-resion, and M6.9 was occurred in sea area near by the coast.About area definition, please see this page.