Caudron C, Girona T, Jolly A et al (2021) A quest for unrest in multiparameter observations at Whakaari/White Island volcano, New Zealand 2007–2018. Earth Planets Space 73:195. https://doi.org/10.1186/s40623-021-01506-0
Himematsu Y, Ozawa T, Aoki Y (2020) Coeruptive and posteruptive crustal deformation associated with the 2018 Kusatsu-Shirane phreatic eruption based on PALSAR-2 time series analysis. Earth Planets Space 72:116. https://doi. org/10.1186/s40623-020-01247-6
Ichiki M, Kaida T, Nakayama T et al (2021) Magma reservoir beneath Azumayama Volcano, NE Japan, as inferred from a three-dimensional electrical resistivity model explored by means of magnetotelluric method. Earth Planets Space 73:150. https://doi.org/10.1186/s40623-021-01451-y
Kametani N, Ishizaki Y, Yoshimoto M et al (2021) Total mass estimate of the January 23, 2018, phreatic eruption of Kusatsu-Shirane volcano, central Japan. Earth Planets Space 73:141. https://doi.org/10.1186/s40623-021-01468-3
Kataoka KS, Tsunematsu K, Matsumoto T et al (2021) Crisis hazard assessment for snow-related lahars from an unforeseen new vent eruption: the 2018 eruption of Kusatsu-Shirane volcano, Japan. Earth Planets Space 73:220. https:// doi.org/10.1186/s40623-021-01522-0
Koyama T, Kanda W, Utsugi M et al (2021) Aeromagnetic survey in KusatsuShirane volcano, central Japan, by using an unmanned helicopter. Earth Planets Space 73:139. https://doi.org/10.1186/s40623-021-01466-5
Kurokawa AK, Ichihara M (2020) Identifcation of infrasonic and seismic components of tremors in single-station records: application to the 2013 and 2018 events at Ioto Island, Japan. Earth Planets Space 72:171. https://doi.org/10. 1186/s40623-020-01302-2
Mannen K, Abe Y, Daita Y et al (2021) Volcanic unrest at Hakone volcano after the 2015 phreatic eruption: reactivation of a ruptured hydrothermal system? Earth Planets Space 73:80. https://doi.org/10.1186/s40623-021-01387-3
Mannen K, Yukutake Y, Kikugawa G, Harada M, Itadera K, Takenaka J (2018) Chronology of the 2015 eruption of Hakone volcano Japan: geological background mechanism of volcanic unrest and disaster mitigation measures during the crisis. Earth Planets Space 70:68. https://doi.org/10.1186/ s40623-018-0844-2
Matsunaga Y, Kanda W, Takakura S, Koyama T, Saito Z, Seki K, Suzuki A, Kishita T, Kinoshita Y, Ogawa Y (2020) Magmatic hydrothermal system inferred from the resistivity structure of Kusatsu-Shirane Volcano. J Volcanol Geotherm Res 390:106742. https://doi.org/10.1016/j.jvolgeores.2019.106742
Melchor I, Almendros J, Carniel R et al (2020) On data reduction methods for volcanic tremor characterization: the 2012 eruption of Copahue volcano, Southern Andes. Earth Planets Space 72:134. https://doi.org/10.1186/ s40623-020-01270-7
Mori T, Hirabayashi J, Nogami K, Onizawa S (2006) A new seismic observation system at the Kusatsu-Shirane volcano. Bull Volcanol Soc Japan Ser 2(51):41–47 (in Japanese with English abstract)
Munekane H (2021) Modeling long-term volcanic deformation at Kusatsu-Shirane and Asama volcanoes, Japan, using the GNSS coordinate time series. Earth Planets Space 73:192. https://doi.org/10.1186/s40623-021-01512-2
Muramatsu D, Matsushima T, Ichihara M (2021) Reconstructing surface eruptive sequence of 2018 small phreatic eruption of Iwo-yama volcano, Kirishima Volcanic complex, Japan, by infrasound cross-correlation analysis. Earth Planets Space 73:8. https://doi.org/10.1186/s40623-020-01344-6
Nakano M, Kumagai H, Chouet BA (2003) Source mechanism of long-period events at Kusatsu-Shirane volcano, Japan, inferred from waveform inversion of the efective excitation functions. J Volcanol Geotherm Res 122:149–164. https://doi.org/10.1016/S0377-0273(02)00499-7
Nurhasan, Ogawa Y, Ujihara N, Tank SB, Honkura Y, Onizawa S, Mori T, Makino M (2006) Two electrical conductors beneath Kusatsu-Shirane volcano, Japan, imaged by audiomagnetotellurics, and their implications for the hydrothermal system. Earth Planets Space 58:1053–1059. https://doi.org/10. 1186/BF03352610
Ohba T, Hirabayashi J, Nogami K (1994) Water, heat and chloride budgets of the crater lake, Yugama at Kusatsu-Shirane volcano, Japan. Geochem J 28:217–231. https://doi.org/10.2343/geochemj.28.217
Ohba T, Yaguchi M, Nishino K et al (2019) Time variation in the chemical and isotopic composition of fumarolic gasses at Kusatsu-Shirane volcano, Japan. Front Earth Sci 7:249. https://doi.org/10.3389/feart.2019.00249
Ohba T, Yaguchi M, Tsunogai U et al (2021) Behavior of magmatic components in fumarolic gases related to the 2018 phreatic eruption at Ebinokogen Ioyama volcano, Kirishima Volcanic Group, Kyushu, Japan. Earth Planets Space 73:81. https://doi.org/10.1186/s40623-021-01405-4
Park I, Jolly A, Lokmer I, Kennedy B (2020) Classifcation of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand. Earth Planets Space 72:92. https://doi.org/10.1186/ s40623-020-01224-z
Rouwet D, Mora-Amador R, Ramírez C et al (2021) Response of a hydrothermal system to escalating phreatic unrest: the case of Turrialba and Irazú in Costa Rica (2007–2012). Earth Planets Space 73:142. https://doi.org/10.1186/ s40623-021-01471-8
Sato E (2021) Kusatsu-Shirane volcano eruption on January 23, 2018, observed using JMA operational weather radars. Earth Planets Space 73:117. https:// doi.org/10.1186/s40623-021-01445-w
Stix J, de Moor JM (2018) Understanding and forecasting phreatic eruptions driven by magmatic degassing. Earth Planets Space 70:83. https://doi.org/ 10.1186/s40623-018-0855-z
Takahashi K, Fujii I (2014) Long-term thermal activity revealed by magnetic measurements at Kusatsu-Shirane volcano, Japan. J Volcanol Geotherm Res 285:180–194. https://doi.org/10.1016/j.jvolgeores.2014.08.014
Terada A (2018) Kusatsu-Shirane volcano as a site of phreatic eruptions. J Geol Soc Japan 124:251–270. https://doi.org/10.5575/geosoc.2017.0060
Terada A, Morita Y, Hashimoto T, Mori T, Ohba T, Yaguchi M, Kanda W (2018) Water sampling using a drone at Yugama crater lake, Kusatsu-Shirane volcano, Japan. Earth Planets Space 70:64. https://doi.org/10.1186/ s40623-018-0835-3
Terada A, Kanda W, Ogawa Y et al (2021) The 2018 phreatic eruption at Mt. Motoshirane of Kusatsu-Shirane volcano, Japan: eruption and intrusion of hydrothermal fuid observed by a borehole tiltmeter network. Earth Planets Space 73:157. https://doi.org/10.1186/s40623-021-01475-4
Tseng KH, Ogawa Y, Nurhasan et al (2020) Anatomy of active volcanic edifce at the Kusatsu-Shirane volcano, Japan, by magnetotellurics: hydrothermal implications for volcanic unrests. Earth Planets Space 72:161. https://doi.org/ 10.1186/s40623-020-01283-2
Ueki K, Inui M, Matsunaga K et al (2020) Oxidation during magma mixing recorded by symplectites at Kusatsu-Shirane Volcano, Central Japan. Earth Planets Space 72:68. https://doi.org/10.1186/s40623-020-01192-4
Yamada T, Kurokawa AK, Terada A et al (2021) Locating hydrothermal fuid injection of the 2018 phreatic eruption at Kusatsu-Shirane volcano with volcanic tremor amplitude. Earth Planets Space 73:14. https://doi.org/10. 1186/s40623-020-01349-1