Mechanism of small vulcanian eruptions at Suwanosejima volcano, Japan, as inferred from precursor inflations and tremor signals - Nishimura, Takeshi; Iguchi, Masato; Yakiwara, Hiroshi; Oikawa, Jun; Kawaguchi, Ryohei; Aoyama, Hiroshi; Nakamichi, Haruhisa; Ohta, Yusaku; Tameguri, Takeshi (Bulletin of Volcanology: Official Journal of the International Association of Volcanology and Chemistry of the Earth`s Interior (IAVCEI), 2013)