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Earth, Planets and Space
Figure 1 | Earth, Planets and Space

Figure 1

From: Groundwater, possibly originated from subducted sediments, in Joban and Hamadori areas, southern Tohoku, Japan

Figure 1

Geological setting. (a) A simplified geological and geographical map of the Fukushima-Ibaraki area and sampling localities 1 to 12; an inset figure shows the location of the study area (box), southern Tohoku, Japan, with plate configurations. On-land geological map is simplified from GeomapNavi (2014). Miocene volcanic rocks are widely distributed in the Abukuma belt but are not shown in (a) to highlight the basement rocks. The sampling area is divided into areas A to E, and an asterisk indicates the epicenter of the Iwaki Earthquake (Japan Meteorological Agency2011). The Fukushima First and Second Nuclear Power Plants are located at FNPP1 and FNPP2, respectively, in area A. (b) A schematic geologic cross section across the offshore Joban basin after Inaba et al. (2009). Ages of sediments are given on each formation.

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