Fig. 1: Index maps of the study area.
From: Geofluid mapping reveals the connection between magmas, fluids, and earthquakes
a Study area in the Northeast Japan arc subducted by the Pacific plate, with the relative velocity being 73 mm/yr38. The figure illustrates the hypocentre and ruptured area of ‘the 2011 off the Pacific coast of Tohoku Earthquake’ (solid star and white broken line, respectively)39 and the volcanic front (red dashed line). b The seismic and magnetotelluric (MT) stations (181 red circles and 110 blue circles, respectively) considered for this study and the inversion grid nodes of 20367 points (small sky-blue circles) for which the P- and S-wave seismic velocities and electrical conductivity were obtained (Supplementary Fig. 1). c Epicentres of 51,358 earthquakes that occurred during 2000–2018 (small green dots have depths ≧ 6 km and light-blue dots have depths <6 km); the open star indicates the hypocentre of the 2008 Iwate-Miyagi Nairiku earthquake (IMN2008) of the magnitude Mj = 7.240. The five boxes represent the fault planes associated with IMN200841. Quaternary volcanoes are shown using red triangles42, and hot springs21 are shown using circles.
