Fig. 4
Estimated interplate slip on the plate interface. The colors are indicative of the magnitude of the aseismic slip. The contour interval is 4 cm. The solid arrows represent aseismic slips larger than 3σ, whereas the gray arrows represent slips less than 3σ. The broken contours indicate the iso-depth contours of the plate interface between the subducting Philippine Sea plate and the overriding Amur plate with a contour interval of 20 km. The blue dots show the epicenters of low-frequency earthquakes for the corresponding period. The stars show the epicenters of the Mw 6.2 Hyuga-nada earthquake on May 10, 2019, and the Mw 6.4 Tanegashima earthquake on January 8, 2019, in (b). a January 1, 2018–January 1, 2019. b January 1, 2019–January 1, 2020. c January 1, 2020–January 1, 2021. d January 1, 2021–January 1, 2022. e January 1, 2022–January 1, 2023. The star indicates the epicenter of the Mw 5.7 earthquake of October 10, 2022. f January 1, 2023–July 1, 2023