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WITHDRAWN -Monitoring of sulfur dioxide flux during the recent eruptions at Fukutoku-Oka-no-Ba and Nishinoshima volcanoes, Japan

Masaaki Morita 1, Toshiya Mori2, Takayuki Kaneko1

  • Affiliations: 1Earthquake Research Institute, The University of Tokyo, Tokyo, Japan; 2Graduate School of Science, The University of Tokyo, Tokyo, Japan

  • Presentation type: Poster

  • Presentation time: Thursday 16:30 - 18:30, Room Poster Hall

  • Poster Board Number: 148

  • Programme No: 2.2.12

  • Theme 2 > Session 2

Abstract

Monitoring volcanic activities at remote underwater volcanoes or volcanic islands is still challenging. We have applied an analysis of sulfur dioxide (SO2) flux using a satellite sensor to monitor recent eruptions at Fukutoku-Oka-no-Ba (FOB) and Nishinoshima volcanoes, Izu--Bonin arc. We used data from the Tropospheric Monitoring Instrument (TROPOMI) onboard the Sentinel-5 Precursor. We estimated an SO2 flux for these volcanoes based on a daily snapshot of the spatial distribution of SO2 column amounts taken by TROPOMI and wind speed from the weather model provided by the Japan Meteorological Agency. For the August 2021 eruption of FOB volcano, SO2 flux during the first sustained plume phase was more than 10,000 t d--1 and up to 75,000 t d--1. In the later Surtseyan explosion phase, SO2 flux decreased to less than 1,000 t d--1 and was sometimes below the detection limit (100 t d--1). For Nishinoshima volcano from August 2021 to December 2022, the daily SO2 flux during the non-eruptive period was 100--1,000 t d--1, often below the detection limit. The daily SO2 flux during the eruptions in August 2021 and September--October 2022 was more than 3,000 t d--1 and reached more than 10,000 t d--1, especially in October 2022. These results indicate that the satellite monitoring of SO2 flux using TROPOMI is an effective tool for eruptive activities at remote underwater volcanoes and volcanic islands.