[S-CG52] Dynamics in mobile belts

[SCG52-P18] Magnetotelluric Measurements around Earthquake Swarm Region in the Northeastern Noto Peninsula

*Ryokei Yoshimura¹, Yoshihiro Hiramatsu², Tada-nori Goto³, Taisei Inui¹, Masahiro Yoshikawa¹, Ayako Namigishi¹, Nagaoka Airi¹, Nakagawa Jun¹, Rintaro Miyamachi¹, Akihiro Sawada², Masato Fukata², Amane Sugii², Ce Zhang², Nagi Yamashita³, Yuki Oshima³, Momoka Kanazawa³, Rei Amano³ (1.Disaster Prevention Research Institute, Kyoto University, 2.Kanazawa University, 3.University of Hyogo)

Keywords:Noto, seismic swarm, resistivity structure

In the northeast of the Noto Peninsula, a swarm of seismic activity has been observed since 2018, and the activity has been active since 2021 while expanding its area. Along with this swarm activity, crustal deformation has been detected by GNSS (Nishimura, 2021). We planned and conducted a subsurface electrical resistivity survey to clarify the structural characteristics of this activity and whether there is any structural difference from the 2007 Noto Hanto Earthquake that occurred in the northwestern part of the Noto Peninsula in March 2007. We obtained wideband magnetotelluric (MT) data at 32 sites in total from November to December 2021, and calculated MT responses by the remote reference technique within the survey area. Except for a few stations, fair sounding curves were estimated in the band range of several hundred Hz to several thousand seconds.
In this presentation, we will report the purpose and outline of the resistivity survey, the characteristics of the obtained MT responses, and compare the results of preliminary three-dimensional analysis with the results of the 2007 Noto Hanto Earthquake (Yoshimura et al., 2008).