Fig. 2
From: MOWLAS: NIED observation network for earthquake, tsunami and volcano

Hi-net station distribution in and around the Kanto-Tokai area. The circles and squares denote stations constructed before and in or after 1997, respectively. Deep and semi-deep boreholes (> 1000 m) are represented by the red circles and the blue squares, respectively. Stations with seismometers of the ETMC system in the Sagami Bay are shown by the green circles