Skip to main content
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Origins and pathways of deeply derived carbon and fluids observed in hot spring waters from non-active volcanic fields, western Kumamoto, Japan

Fig. 1

Map showing the study area and its geological background. a Tectonic structure of the Kyushu Islands with location of active volcanoes (red triangle) and some important localities explained in the main text. The Beppu–Shimabara and Kagoshima grabens are after Matsumoto (1979) and Hayasaka (1987). Yellow hatch indicates an area, where subsurface high conductivity blocks distribute in and beneath lower crust which were depicted from recent electrical resistivity survey (Hata et al. 2017). b Sampling locations shown on topographical map with locality name and major fault systems. c A–A’ cross section in panel a showing the locations of low frequency micro earthquakes during 2002–2016 (purple circles) and low seismic velocity zones (red color) in the mantle wedge and crust (Zhao et al. 2018). d Simplified geological map modified after Moreno et al. (2016). Geographical distribution of three types of fluids, High-Cl, Low-concentration and High-HCO3 fluids, are also shown

Back to article page