Figure 1

Tectonic map of the study area. The black barbed lines represent the plate boundary, and the triangles indicate the direction of motion of the subducting plate with respect to the plate being subducted (Bird28). The white arrows represent the velocity vectors of the Philippine Sea plate with respect to the Amurian plate (DeMets et al.22). The map was created by using the Generic Mapping Tools (GMT)27 (version: GMT4.5.7, URL link: https://www.generic-mapping-tools.org/download/).