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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Microtremor array surveys and development of the velocity model in the Hakodate Plain, Hokkaido, Japan

Fig. 1

Index map of the study area. a Topographical map drawn using the Digital Map (Basic Geospatial Information) of the Geospatial Information Authority of Japan. b Geological map drawn referring to Geological Survey of Japan (2020), Hata et al. (1984), and Shibata et al. (2009). The configurations of large triangle arrays (L array) at each site are shown in the two maps with thin solid lines. The red lines correspond to the active fault traces on the western margin of Hakodate Plain identified in National Institute of Advanced Industrial Science and Technology (AIST) (2019). OF Oshima-Ono Fault, TF Tomikawa Fault. The purple lines represent the reflection survey lines (OSM18-1D and OSM18-2H) by Sato et al. (2019), and solid circles indicate the locations of hot spring wells (H480-017 and H480-020, Geological Survey of Hokkaido 1995). The location of the study area is displayed in the inset map of a. The focal mechanism of the 1968 Tokachi-oki earthquake determined by Kanamori (1971) is plotted in the inset map

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