The sequence of the 2017–2018 eruptions and seismo-acoustic activity at Kirishima volcano group

Earth, Planets and Space

Full Paper

Tsukasa Kobayashi¹  Takayuki Kaneko²  Mie Ichihara²  Atsushi Watanabe²  Takao Ohminato²  Fukashi Maeno²  Setsuya Nakada³ 

[1] Japan Meteorological Agency, Tokyo, Japan;The Earthquake Research Institute, The University of Tokyo, 113-0032, Tokyo, Japan;The National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan;

关键词: Eruption sequence;    Volcanic group;    Volcanic tremor;    Eruption types;    Volcano monitoring;   

DOI  :  10.1186/s40623-023-01883-8

 received in 2023-03-31, accepted in 2023-08-16,  发布年份 2023

来源: Springer

【 摘 要 】

Kirishima volcano consists of more than 20 eruptive centers. Among them, Shinmoe-dake had magmatic eruptions in October 2017 and March 2018. Subsequently, another active cone, Iwo-yama, had phreatic eruptions in April 2018. These events were unique in that the 2018 eruption was the first effusion-dominated eruption of Shinmoe-dake and the first simultaneous activity of two cones of the Kirishima volcanic group ever documented. We report the detailed sequence of the events by combining areal photos, satellite images, and seismo-acoustic data analyses with the other published information. The seismo-acoustic data clarify the eruption onset and the transitions of the behaviors in three stages for each of the 2017 and 2018 eruptions. For both eruptions, we present regularly repeated tremors or ’drumbeat’ earthquakes in the second stage, which interpret as gas separation from magma, leading to the ash-poor plume in the 2017 eruption or the effusive eruption in the 2018 event. We also propose that the 2017 and 2018 eruptions of Shinmoe-dake and the 2018 eruption of Iwo-yama are sequential events linked by the degassing of magma beneath Shinmoe-dake. An eruption like the 2017–2018 eruptions of Shinmoe-dake would leave few geological records and could be captured only by modern techniques. Although Shinmoe-dake has been believed to be an example of less-frequent eruptions, effusive eruptions like the 2018 case might have occurred more frequently in the past , but the following eruptions had obscured their records. The timelines summarized in this study will be useful in future studies of Kirishima volcanoes and world equivalences.Graphical Abstract

【 授权许可】

CC BY   
© The Society of Geomagnetism and Earth, Planetary and Space Sciences / The Seismological Society of Japan / The Volcanological Society of Japan / The Geodetic Society of Japan / The Japanese Society for Planetary Sciences 2023

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