Fig. 1
From: Heat flow data and thermal structure in northeastern Japan
Tectonic setting of the Northeastern part of Japan. Quaternary volcanoes in Northeastern Japan arc are shown by red triangles. Active volcanoes are also shown by pink triangles. The thick black cross indicates Hi-net observation sites. The red dashed line indicates the volcanic front (Yoshida et al. 2013). The green hatch area indicates the location of the Ou Backbone Range