Fig. 1
From: Deep groundwater discharge after the 2011 Mw 6.6 Iwaki earthquake, Japan
Map of study location. a Hot spring water discharge after the 2011 Iwaki earthquake (red circles), where A and B denote sampling sites used in this study. Star and red lines show epicenter and faults that moved during earthquake, respectively. The fault names are after Mizoguchi et al. (2012). C denotes rain gauge operated by Japan Meteorological Agency (2019). Using geographical data from Geospatial Information Authority of Japan (2019), contour line interval is 200 m above sea level (light green areas: > 200 m; light yellow areas: > 400 m; orange areas > 600 m). Purple area indicates area labeled as “Joban” in Togo et al. (2014). b Schematic cross-section around hot springs at A, B, and Yumoto based on Sugai et al. (1957) and Ohara (1996). c Temporal changes in the Global Navigation Satellite System baseline between Iwaki and Iwaki2 (indicated by green circles in a) from Geospatial Information Authority of Japan (2011)