[M-TT52] インフラサウンド及び関連波動が繋ぐ多圏融合地球物理学の新描像

[MTT52-P03] Volcanic atmospheric perturbation detected with barometer, broadband seismometer, and GNSS-TEC: comparison with ray-tracing calculation

*中島 悠貴¹、西田 究¹、青木 陽介¹、日置 幸介² (1.東京大学地震研究所、2.北海道大学宇宙測地学研究室)

キーワード：GPS、GNSS、電離圏、火山噴火、GPS-TEC、GNSS-TEC

We investigate an atmospheric perturbation excited by the Kuchinoerabujima phreatomagmatic eruption that occurred at 0:59 UT on 25th May in 2015. It made an ionospheric perturbation, and we extracted the signal from GEONET 1 Hz sampling data by the GNSS-TEC method. The signal has a ~10 mHz N-shaped pulse and a ~5 Hz wave continuing about 15 min. These features are quite similar to ionospheric perturbation excited by the Asama volcano eruption in 2004 (Heki 2006; Chonan et al., 2017). We also found barometric disturbance in almost the same frequency band with barometers and broadband seismometers installed by NIED and AIST. We tried to explain all of the detected signals with ray-tracing calculation. In this presentation, we will introduce the results and discuss the features of the phenomena.

Acknowledgment
We thank the Geospatial Information Authority of Japan (GSI) for the GEONET RINEX data (ftp://terras.gsi.go.jp/), National Research Institute for Earth Science and Disaster Resilience (NIED) for F-net and V-net data, and National Institute of Advanced Industrial Science and Technology (AIST) for the barometers data.