Figure 1
From: Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake
Map of the seismic sequence of the 2018 Northern Osaka earthquake in Japan (Mj 6.1). Green star and square show the epicentre of the mainshock and the radon monitoring site (Osaka Medical and Pharmaceutical University, OMPU), respectively. Black, red, and blue solid circles indicate earthquakes > Mj 1.0, focal depth < 30 km in the normal (from March 2014 to February 2017), preseismic (from March 2017 to the main shock on 18 June 2018), and postseismic (aftershock, from 18 June 2018 to 31 July 2020) periods, respectively. Diamond symbols indicate seismic intensities at the moment of the mainshock42. Grey rectangles indicate source faults40. Red lines indicate active faults43: ATF Arima–Takatsuki Fault, IF Ikoma Fault, UF Uemachi Fault. The figure is drawn by Generic Mapping Tool44 (version 5.4.5, http://gmt.soest.hawaii.edu/doc/5.4.5/index.html#).
