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Journal of Geography (Chigaku Zasshi), 2022 Vol.131 No.1

2022 Vol.131 No.1

Pumice Raft from August 2021 Eruption of Fukutoku-Oka-no-Ba Volcano, at Shidooke Beach, Kikaijima Island, Kagoshima

Fukutoku-Oka-no-Ba (FOB) volcano is a submarine volcano located in the southern Izu-Bonin Arc. Based on observation data collected by the Himawari-8 meteorological satellite, FOB volcano erupted from around 06:00 on August 13, 2021. The climax of the eruption occurred on the same day, generating an eruption column of about 16 km in altitude, which reached the tropopause. It was visible from the Ogasawara Islands, which are located more than 300 km away. Furthermore, aircraft observation by the Japanese Coast Guard found a new emergent island formed from the eruption on August 15. Formation of a new island at FOB volcano occurred for the first time since the 1986 eruption 35 years before. From the satellite observations, it was recognized that a large volume of pumice started to float with water discoloration in the proximity of the eruption center soon after the eruption began.
 Pumice is a highly vesicular, low-density, pyroclastic rock, which can float in water for long periods of time. A large volume of floating pumice (pumice rafts) generated from this eruption was transported west by currents and winds. It started to arrive at the Daito and Ryukyu Islands from early October, washing up on local beaches and coasts and causing hazards to fisheries and marine transportation.
 Kikaijima is located ∼20 km east of Amami-Oshima. It is a flat-topped island with thick Pleistocene limestone covering sedimentary rocks of the Pliocene Shimajiri Group. Radiometric ages of ca. 100 ka were obtained from fossilized coral at the highest plateau of the island (∼200 m above sea level), indicating rapid uplift of the island (Inagaki and Omura, 2006). Pumice rafts from the FOB eruption choked many complex inlets around the island, where they are expected to remain for a long period of time.

(Photograph & Explanation: Kenichiro TANI; Photographed on October 16, 2021)


[Inagaki, M. and Omura, A. (2006): Uranium-series age of the highest marine terrace of the upper Pleistocene on Kikai Island, central Ryukyus, Japan. Quaternary Research (Daiyonki-Kenkyu), 45, 41-48. (in Japanese with English abstract)]

Review Article

Mid-Permian Fusulinoidean Territories in Panthalassa

Shigeki HADA and Hiroya GOTO

Journal of Geography (Chigaku Zasshi), 2022, 131(1), 1.


Original Articles

Mechanisms for Sustaining the Local Labor Markets in International Mountain Resorts:
 A Case Study of Whistler, Canada


Journal of Geography (Chigaku Zasshi), 2022, 131(1), 23.


Making a Magnetic Deviation Map with Azimuth Survey Data of Ino Tadataka


Journal of Geography (Chigaku Zasshi), 2022, 131(1), 47.


Short Articles

Transnational Migration of Koreans and the Ethnic Space in Greater London, UK:
 Perspectives on Residential Selection and Educational Behavior

Jiyeon SHIN

Journal of Geography (Chigaku Zasshi), 2022, 131(1), 67.


Origin of a Temporary Pond, Akaike, at the Northern Foot of Mount Fuji, Japan,
 July 2020

Seongwon LEE and Masaya YASUHARA

Journal of Geography (Chigaku Zasshi), 2022, 131(1), 83.



Trends of Geosciences after the Pacific War in Japan, 1945 to 1965 Part 7

Editorial Committee of History of Geosciences in Japan,
Tokyo Geographical Society

Journal of Geography (Chigaku Zasshi), 2022, 131(1), 95.


Legal Procedure for Collecting Samples in a National Park
 Based on the Natural Parks Act:
 Example of Application Procedure for a Special Zone and a Marine Park Zone
 of Keramashoto National Park


Journal of Geography (Chigaku Zasshi), 2022, 131(1), 115.


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