Permalink : http://hdl.handle.net/2115/73389

JaLCDOI : 10.14943/gbhu.82.25

We performed a broadband MT survey in the northern part of Mt. Meakandake, one of the active volcanoes in eastern Hokkaido to clarify the relationship between the subsurface electrical structure and the volcanic activities of this area. On the northeastern foot of Meakandake, remarkable crustal deformation from late 2016 through 2017. We planned a magnetotelluric survey to investigate the electrical structure across the deformation source. In this study, we describe the features of our MT data and show the 1-D models as a preliminary modeling. In the inversion, we only used a frequency range between about 0.1 and 100 Hz, in which the responses showed approximately a 1-D feature. The inverted 1-D models exhibited distinct low resistivity layer (1-10Ωm) at depths around a few hundred meters to 1 km at all sites. In addition, at the sites in the SE half of the survey line, another low resistivity layer of approximately 10Ωm was associated at a depth around 2-3 km.