Fig. 1
From: Characteristics of the foreshock occurrence for Mj3.0 to 7.2 shallow onshore earthquakes in Japan
Cumulative number of shallow onshore earthquakes in Japan from the JMA earthquake catalogue. The red circles, green squares and blue triangles show the time period from 2001 to 2021, 2001 to 2016 and 2016 to 2021, respectively. There was a change for the earthquake detection processing system in 2016. The black dashed line indicates the earthquake completeness level cutting at Mj1.0 used in this study