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No.72 (2001/9) >

 
Title :Miocene to Pleistocene stress field transitions, around the Miyako-jima Island, South Ryukyu, Japan
Authors :Otsubo, Makoto
Hayashi, Daigoro
Authors alternative :林, 大五郎
Issue Date :Sep-2001
Abstract :Three paleostress transitions are measured in Miyako-jima Island. NW-SE and NE-SW extensions are recorded in the Simajiri Group. Strike-slip type stress state where σ_1 directs to N-S and σ_3 directs to E-W, is recorded in the Ryukyu Group. Transition of paleostress is considered as follows. Before the sedimentation of the Shimajiri Group, NW-SE extension occurred in the Miyako-jima because the Miyako-jima was extended toward the Ryukyu Trench by the trench retreat during the subduction of the Philippine Sea plate. During the sedimentation of the Shimajiri Group, the arc-parallel stretching occurred in the Miyako-jima because the Okinawa Trough started to push the Miyako-jima toward the Ryukyu Trench. Then NE-SW extension occurred in the area. During the sedimentation of the Ryukyu Group, strike-slip type stress state occurred by the sinistral strike-slip movement along the central rift in the Okinawa Trough.
Type Local :紀要論文
ISSN :0286-9640
Publisher :琉球大学理学部
URI :http://hdl.handle.net/20.500.12000/2622
Citation :琉球大学理学部紀要 = Bulletin of the College of Science. University of the Ryukyus no.72 p.97 -110
Appears in Collections:No.72 (2001/9)

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