2:00 PM - 2:15 PM
[SVC30-02] Satellite observation of discolored seawater and pumice derived by submarine volcano Fukutoku-Oka-no-Ba
Keywords:Satellite, Remote sensing, Pumice, Discolored seawater, Volcano
A large-scale eruption occurred at Fukutoku-Oka-no-Ba on August 13, 2021, and discolored seawater and pumice were observed by satellite. Fukutoku-Oka-no-Ba is a submarine volcano located about 1,300 km south of Tokyo, and constant local observations are limited. In addition, the pumice drifted over a wide area, affecting the navigation of ships, the tourism industry, and the fishing industry including aquaculture. In such a situation, satellites are very effective as a means of monitoring volcanic activity and the distribution of pumice.
The optical satellite "Shikisai" has confirmed discolored seawater around Fukutoku-Oka-no-Ba even before the eruption. Discolored seawater is a phenomenon in which seawater changes color due to volcanic activity, and is thought to reflect changes in volcanic activity. After the eruption on August 13, discolored seawater over 50 km in length was observed until late August. Although the scale of discolored seawater has decreased since then, it is still occurring, and we need to continue to monitor the scale and density of discolored seawater.
The eruption also produced a large amount of pumice, which reached a wide area along the Pacific coast, including Okinawa Prefecture, and has had a significant impact on society. Therefore, we attempted to understand the distribution of pumice as a material for decision-making on local countermeasures and future predictions. We found that pumice can be identified by using visible images, daytime thermal infrared images, and pseudo color images, and the range of pumice read by the satellite was disclosed on the website. By utilizing data from both GCOM-C and the European satellite Sentinel-2, we have been able to increase the range and frequency of pumice detection in the ocean.
In this presentation, we will present the results of satellite observations of discolored seawater and pumice associated with the recent volcanic activity at Fukutoku-Oka-no-Ba.
The optical satellite "Shikisai" has confirmed discolored seawater around Fukutoku-Oka-no-Ba even before the eruption. Discolored seawater is a phenomenon in which seawater changes color due to volcanic activity, and is thought to reflect changes in volcanic activity. After the eruption on August 13, discolored seawater over 50 km in length was observed until late August. Although the scale of discolored seawater has decreased since then, it is still occurring, and we need to continue to monitor the scale and density of discolored seawater.
The eruption also produced a large amount of pumice, which reached a wide area along the Pacific coast, including Okinawa Prefecture, and has had a significant impact on society. Therefore, we attempted to understand the distribution of pumice as a material for decision-making on local countermeasures and future predictions. We found that pumice can be identified by using visible images, daytime thermal infrared images, and pseudo color images, and the range of pumice read by the satellite was disclosed on the website. By utilizing data from both GCOM-C and the European satellite Sentinel-2, we have been able to increase the range and frequency of pumice detection in the ocean.
In this presentation, we will present the results of satellite observations of discolored seawater and pumice associated with the recent volcanic activity at Fukutoku-Oka-no-Ba.