Heat transport process associated with the 2021 eruption of Aso volcano revealed by thermal and gas monitoring

• DOI: 10.1186/s40623-024-01984-y
• Publication Date: 2024-04-30T04:01:39Z
• Authors: Shohei Narita; Akihiko Yokoo; Takahiro Ohkura; Masaaki Morita; Toshiya Mori; Shin Yoshikawa
• Keywords: Phreatic eruption

Abstract The thermal activity of a magmatic–hydrothermal system commonly changes at various stages volcanic activity. Few studies have provided an entire picture the such over eruptive cycle, which is essential for understanding subsurface heat transport process that culminates in eruption. This study quantitatively evaluated sequence associated with two phreatic eruptions 2021 Aso volcano. We estimated plume-laden discharge rates and corresponding H 2 O flux during 2020–2022 by using simple methods. then validated comparison gas monitoring results. Our results showed rate varied substantially throughout cycle. During pre-eruptive quiescent period (June 2020–May 2021), anomalously large (300–800 MW) were observed likely due to enhanced magma convection degassing. run-up (June–October there was no evident change (300–500 MW), but this accompanied simultaneous pressurization heating underlying hydrothermal system. These signals imply progress partial sealing In co-eruptive period, subsequent supply from magmatic region resulted additional pressurization, led first eruption (October 14, 2021). peaked (2000–4000 day before second 19, sustained chamber eventually more explosive post-eruptive (~ 1000 continued four months, finally returned background level (< 300 early March 2022. Despite models, we tracked transient revealed processes Graphical abstract