[S-EM16] Electromagnetic Induction in the Earth and Planetary Interiors, and Tectono-Electromagnetism

[SEM16-P05] Wideband Magnetotelluric and Magnetic Surveys across the Tendaho Graben in the Afar Depression, Ethiopia

*Ryokei Yoshimura¹, Naoto Ishikawa², Tesfaye Kidane Birke³, Shin-ichi Kagashima⁴, Nobutatsu Mochizuki⁵, Ameha Atnafu Muluneh³, Kirika Kitagawa⁴ (1.Disaster Prevention Research Institute, Kyoto University, 2.Graduate School of Human and Environmental Studies, Kyoto University, 3.Addis Ababa University, 4.Faculty of Science, Yamagata University, 5.Priority Organization for Innovation and Excellence, Kumamoto University)

Keywords:Afar Depression, Ethiopia, magnetotelluric survey, magnetic survey

The Afar area (Ethiopia) is well known as one of continental rifts transitioning to oceanic spreading centers. In order to delineate subsurface electric properties and document an initial stage of the formation process of magnetic stripes, we carried out wideband magnetotelluric (MT) measurements and ground magnetic survey along a common profile in 2016 and 2017. This profile, approximately 55km long, cuts across the Tendaho Graben in the Afar Depression. In MT survey, we obtained electromagnetic and electric data at 14 sites using MTU-5A (Phoenix Geophysics) and ELOG1K-PHX (NT system design) systems. In magnetic survey on foot, we recorded total magnetic fields at 2.4 meters above the ground every 4 seconds by utilizing GSM-19 Overhauser magnetometer (GEM systems). In this presentation, we will introduce the outline of our project and show preliminary results of MT and magnetic surveys.