IJESD 2018 Vol.9(10): 282-289 ISSN: 2010-0264
doi: 10.18178/ijesd.2018.9.10.1115
doi: 10.18178/ijesd.2018.9.10.1115
Some Thoughts on the Risk of Natural Disasters in Ryukyu Archipelago
Ömer Aydan
Abstract—Ryukyu Archipelago is situated on Ryukyu Arc
and consists of 6 major islands together with 55 islands of
various sizes. Compared to the other parts of Japan, the
documented seismic history of Ryukyu Archipelago is not well
known. However, there are huge tsunami boulders, which
definitely imply mega earthquakes in the vicinity of Ryukyu
Archipelago. Furthermore, the archipelago experiences great
typhoons every year compared with other parts of Japan. The
Ryukyu limestone formation overlaying Shimajiri formation
consisting of mudstone, sandstone and tuff cover a huge area in
many islands of the archipelago. While large scale sinkholes and
cliff failures observed in association with Ryukyu limestone
formation, large scale landslides are commonly observed in
Shimajiri formation as geotechnical disasters. It is shown that
the risk of mega earthquakes, mega-tsunamis, large-scale
geotechnical disasters are quite high in addition to
super-typhoons in Ryukyu Archipelago.
Index Terms—Ryukyu archipelago, natural disaster, risk, earthquake, tsunami, landslides, typhoons.
Ömer Aydan is with University of the Ryukyus, Dept. of Civil Engineering, Nishihara, Okinawa, Japan; he is also with Disaster Prevention Research Center for Islands Regions, Nishihara, Okinawa, Japan (e-mail: aydan@tec.u-ryukyu.ac.jp).
Index Terms—Ryukyu archipelago, natural disaster, risk, earthquake, tsunami, landslides, typhoons.
Ömer Aydan is with University of the Ryukyus, Dept. of Civil Engineering, Nishihara, Okinawa, Japan; he is also with Disaster Prevention Research Center for Islands Regions, Nishihara, Okinawa, Japan (e-mail: aydan@tec.u-ryukyu.ac.jp).
Cite: Ömer Aydan, "Some Thoughts on the Risk of Natural Disasters in Ryukyu Archipelago," International Journal of Environmental Science and Development vol. 9, no. 10, pp. 282-289, 2018.
General Information
- ISSN: 2010-0264 (Print); 2972-3698 (Online)
- Abbreviated Title: Int. J. Environ. Sci. Dev.
- Frequency: Bimonthly
- DOI: 10.18178/IJESD
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