Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

S (Solid Earth Sciences) » S-VC Volcanology

[S-VC41] Active Volcanism

Tue. May 22, 2018 1:45 PM - 3:15 PM Convention Hall A (CH-A) (2F International Conference Hall, Makuhari Messe)

convener:Yuta Maeda(Nagoya University), Takahiro Miwa(National research institute for earth science and disaster prevention), Yosuke Aoki(東京大学地震研究所, 共同), Takeshi Nishimura(Department of Geophysics, Graduate School of Science, Tohoku University), Takahiro Ohkura(Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science, Kyoto University), Satoshi Okumura(Division of Earth and Planetary Materials Science, Department of Earth Science, Graduate School of Science, Tohoku University), Tomofumi Kozono(Department of Geophysics, Graduate School of Science, Tohoku University), Chairperson:Kaneko Takayuki, Shimano Taketo

1:45 PM - 2:00 PM

[SVC41-25] Observation of eruptive activities in the Asia-Pacific region in 2017 using infrared images of Himawari-8

*Takayuki Kaneko1, ATSUSHI YASUDA1 (1. Earthquake Research Institute, University of Tokyo)

Keywords:volcano, remote sesing , Asia-Pacific region

We developed satellite-based monitoring system using Himawari-8 AHI (Advanced Himawari Imager) and MODIS and have been observing 168 active volcanoes in the Asia-Pacific region. Himawari-8, carrying a newly developed sensor AHI, can be used for thermal analysis, because of the improved resolution (2 km) in the infrared channels. The high observation frequency, every 10 minutes, is particularly useful for thermal analysis of eruption sequences, which include events to occur within a short period, such as explosions or collapsing. Based on the monitoring system using Himawari-8 AHI, we observed more than ten small to medium-scale eruptions in the Asia-Pacific region in 2017, such as in Sinabung, Nishinoshima or Aoba volcanoes. By examining these results, we could recognize some close relationship between eruptive modes and patterns of temporal variation of thermal anomaly. Effusive activities involving Strombolian lava fountain show near-constant gentle variations on the long-term observation (one year) and near-constant values on the short-term observation (twenty-four hours) as well. This suggests that lava effusion is very constant. On the other hand, effusive activities of high-viscosity lava show patterns consisting of scattering values on the long-term observation, and asymmetric pulses (rapid-increasing and gentle-decreasing) on the short-term observation occasionally. These asymmetric pulses are considered to be caused by rock-fall events related to the collapse of a part of the lava dome or thick lava flow. We also analyzed the 2017 Nishinoshima activity in conjunction with high-resolution infrared images from Landsat-8. In December 2017, JAXA had successfully launched the new Global Change Observation Mission-Climate (GCOM-C) satellite, carrying Second Generation Global Imager (SGLI). We are also developing a system using GCOM-C SGLI images to enhance the observation capability for volcanoes.