Research Station on Seismo Electromagnetics, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan

Department of Information and Communication Engineering, The University of Electro-Communications, Chofu Tokyo, Japan

Matsudo Municipal Matsudo High School, 2-7-5 Kamishiki, Matsudo, Chiba, Japan

Research Station on Seismo Electromagnetics, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan

Department of Electronic Engineering, The University of Electro-Communications, Chofu Tokyo, Japan

Research Station on Seismo Electromagnetics, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan

Department of Electronic Engineering, The University of Electro-Communications, Chofu Tokyo, Japan

Research Station on Seismo Electromagnetics, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan

Department of Electronic Engineering, The University of Electro-Communications, Chofu Tokyo, Japan