Publication Date:
2022-03-18
Description:
The Japan Coast Guard has been observing volcanoes in the adjacent seas of Japan for safety ship navigation, volcanic disaster prevention, and securing marine interests. The target volcanoes are volcanic islands and submarine volcanoes in the Izu-Ogasawara Islands and the Ryukyu Islands, and the observations are being made using aircraft and survey vessels. Observations by aircraft are visual observations, thermal observations, and geomagnetic observations, and observations by survey vessels are topographical surveys, geomagnetic and gravity observations, water sampling, sediment dredging, and crustal structure exploration. In the last decade, large-scale eruptions have occurred on Nishinoshima Volcano and Kuchinoerabujima Volcano, and eruptive activity has continued intermittently on Suwanosejima Volcano, Sakurajima Volcano, and Satsuma-Iojima Volcano. In addition, unusual geothermal and hydrothermal phenomena were observed in Myojinsho and Aogashima. The Japan Coast Guard has endeavored to prevent volcanic disasters by appropriately observing these volcanic activities and reporting the results to The Coordinating Committee for Prediction of Volcanic Eruptions. In addition, a comprehensive survey of volcanoes is conducted in advance during calm normal times of volcanic activity for the purpose of comparison with the time of eruption. The observation of marine volcanoes has many challenges that are different from those of land volcanoes, but it is necessary to promote the sophistication of those observations while incorporating new technologies such as observations from satellites and quantitative analysis of the color tone of the discolored water.
Description:
Published
Description:
Refereed
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp.82-94
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