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No.27 (1979/03) >

Title :A Mode of the "URUMA" Crustal Movement in the Southeastern Part of the Okinawa-jima, Ryukyu Island
Authors :Maruo, Yuji
Furukawa, Hiroyasu
Kizaki, Koshiro
Authors alternative :丸尾, 祐治
古川, 博恭
木崎, 甲子郎
Issue Date :Mar-1979
Abstract :The Ryukyu limestone of the Quarternary period develops well in the southeastern part of the Okinawa-jima, where it is regarded to be one of the type localities together with the underlying Shimajiri group. The limestone formation is divided into quite a few blocks by a series of faults representing platforms of various heights of 150 to 180m. The fault movement signifies the Uruma event of the Quarternary crustal movement. (Okinawa Quarternary Research Group, 1976, Kizaki and Takayasu, 1976). The present study based on the surface survey, drilling and electric prospecting shows that the structure of the limestone platform and the surrounding staircase topography of the area is resulted from a combination of uplift and subsequent concave landslide-like antithetic step faults. The period of the movement is defined here as after the sedimentation of the Ryukyu limestone and before the sedimentation of the terrace limestone which corresponds to the Machinato limestone of MacNeil (1960).
Type Local :紀要論文
Publisher :琉球大学理工学部
URI :http://hdl.handle.net/20.500.12000/23767
Citation :琉球大学理工学部紀要. 理学編 = Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences no.27 p.89 -98
Appears in Collections:No.27 (1979/03)

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