Miocene to Pleistocene stress field transitions, around the Miyako-jima Island, South Ryukyu, Japan.
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Accession number;01A1038949
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| Title;Miocene to Pleistocene stress field transitions, around the Miyako-jima Island, South Ryukyu, Japan. |
| Author;
OTSUBO M
(Univ. Ryukyus, Okinawa, Jpn)
HAYASHI D
(Univ. Ryukyus, Okinawa, Jpn)
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Journal Title;Bulletin of the College of Science, University of the Ryukyus
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Journal Code:S0995A
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ISSN:0286-9640
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VOL.;NO.72;PAGE.97-110(2001)
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| Figure&Table&Reference;FIG.8, TBL.1, REF.22 |
| Pub. Country;Japan |
| Language;English |
| 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 .SIGMA.1 directs to N-S and .SIGMA.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. (author abst.) |
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