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

Fig. 1

From: Electrical conductive fluid-rich zones and their influence on the earthquake initiation, growth, and arrest processes: observations from the 2016 Kumamoto earthquake sequence, Kyushu Island, Japan

Fig. 1

Map of the study region showing (a) the broadband magnetotelluric (MT; 153 open squares) and telluric-only sites (47 open circles) used in this study are shown. The blue star and line, the red star, and two dashed boxes indicate the epicenters and fault planes of the Mw 6.2 foreshock and Mw 7.0 mainshock of the 2016 Kumamoto earthquake sequence, respectively. Black open circles are the epicenters of the crustal earthquakes (M > 2, < 30 km depth) that occurred after the Mw 6.2 foreshock of the 2016 Kumamoto earthquake sequence (14 April 2014–30 June 2019). White open circles are the epicenters of the earthquakes before the Mw 6.2 foreshock of the 2016 Kumamoto earthquake sequence (1 January 1993–14 April 2014). Large and small triangles show the current active and extinct Quaternary volcanoes, respectively. Faults are represented by green lines. HF: Hinagu Fault, FF: Futagawa Fault, MF: Midorikawa Fault, KP: Kumamoto Plain. Note that there are an additional 14 sites used in this study that lie outside of the presented study region (see Additional file 1: Fig. S1)

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