[U-15] The 2024 Noto Peninsula Earthquake (1:J)

[U15-P64] Space-time evolution of fault slip synchronized with earthquake swarms in the Noto Peninsula observed by dense GNSS networks

*Atsushige Doi¹, Takuya NISHIMURA², SHINICHI MIYAZAKI¹ (1.Graduate School of Science, Kyoto University., 2. Disaster Prevention Research Institute, Kyoto University.)

Keywords:Noto Peninsula, crustal deformation, earthquake swarm, time dependent inversion

A seismic swarm have been observed in Noto Peninsula since December 2020 and transient deformation also have been observed by GNSS networks (Nishimura et al.,2023). In Nishimura et al.(2023), the observed cumulative transient displacements show radial horizontal pattern and was uplift. The seismic swarm can be divided into four clusters. Nishimura et al.(2023) inverted GNSS displacements for a shear slip and opening crack, and the synthesised displacements fitted to the observation. Nishimura et al.(2023) proposed that rich fluid found beneath Noto Peninsula had triggered seismic swarm. Following those results, we estimated space-time evoution of fault slip using GNSS data from 2020 to 2023 with the Monte Carlo mixture Kalman filter (MCMKF) - based inversion (Fukuda et al.,2004). We ran inversions for shear slips and openings independently, and then the result of the opening model was better than that of the shear slip model.
Acknowledgements: The SoftBank GNSS observation data used in this study were provided by SoftBank Corp. and ALES Corp. through the framework of the “Consortium to utilize the SoftBank original reference sites for Earth and Space Science”. We thank GSI, Japan, and Kanazawa Univ. for providing GNSS data.