Crustal Deformation around the Western Nagaoka Plain Fault Zone based on Densified GNSS Observation Network

Takeshi Sagiya

Presentation information

[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT37] New Frontier of Earth Science pioneered by Dense GNSS Observation Networks

Wed. May 29, 2024 1:45 PM - 3:00 PM 301B (International Conference Hall, Makuhari Messe)

convener:Yusaku Ohta(Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University), Takuya NISHIMURA(Disaster Prevention Research Institute, Kyoto University), Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Mikiko Fujita(Japan Agency for Marine-Earth Science and Technology), Chairperson:Mako Ohzono(Institute of Seismology and Volcanology, Faculty of Science, Hokkaido University), Ryosuke Doke(Graduate School of Science and Technology, Hirosaki University)

2:00 PM - 2:15 PM

[MTT37-02] Crustal Deformation around the Western Nagaoka Plain Fault Zone based on Densified GNSS Observation Network

*Takeshi Sagiya¹ (1.Disaster Mitigation Research Center, Nagoya University)

Keywords:GNSS, crustal deformation, Western Nagaoka Plain fault

The Western Nagaoka Plain Fault is in an active deformation zone in the Mid-Niigata region where the 2004 Chuetsu and the 2007 Chuetsu-oki earthquakes happened. The existence of active folding and inelastic deformation has been pointed out by previous studies. For a better understanding of ongoing crustal deformation and stress build-up, dense GNSS observation is highly useful. In this area, The Association for Earthquake Prediction and Nagoya University have been operating 20 continuous GNSS sites since 2010. In this study, we also analyze data from 30 stations of a dense GNSS network operated by SoftBank Corp.
We processed the raw GNSS data during 2019-2022 with the Bernese GNSS software version 5.4 with the Precise Point Positioning approach. We discuss the quality of the daily coordinate solutions, velocities as well as strain rates around the fault zone. The potential of the densified GNSS network for tectonic studies will be also discussed.