GNSS-TEC observations of the atmospheric resonance excited by the 2015 April Plinian eruptions of the Calbuco volcano, Chile: Comparison with the 2014 Kelud eruption

Yuki Nakashima, Hokkaido University, Institute of Seismology and Volcanology, Sapporo, Japan and Kosuke Heki, Hokkaido University, Sapporo, Japan