Studies of Land Bridges and the Migration of Men and Other Animals along Them. Detailed Bathymetric Features of Tokara and Kerama Gaps in the Ryukyu Arc

Autor:	Takeshi Matsumoto, Akiko Nakamura, Misumi Aoki, Masaaki Kimura
Rok vydání:	1996
Předmět:	Global and Planetary Change Pleistocene Geography Planning and Development Trough (geology) Geology Gravity anomaly Geological structure Tectonics Geophysics Trench Bathymetry Seismology Saddle Earth-Surface Processes
Zdroj:	Journal of Geography (Chigaku Zasshi). 105:286-296
ISSN:	1884-0884 0022-135X
DOI:	10.5026/jgeography.105.3_286
Popis:	Precise topographic features at the two major structural boundaries in the Ryukyu Arc, Tokara Gap and Kerama Gap, revealed that there exists a ridge feature of the Ryukyu Arc as a saddle topography. The feature supports the idea recently proposed that a landbridge connecting the Chinese continent, Ryukyu Islands and Japanese Islands, is thought to have been subsided since Late Pleistocene. The saddle is offset by large-scale left-lateral normal faults both of which are related to the opening of the Okinawa Trough. These topographic features and geological structure together with the gravity anomaly and regional tectonics in the Ryukyu area suggest that a north-south tensional stress regime, due to the rolling buck of the Philippine Sea Plate at the Ryukyu Trench, has dominated in this region since last 20, 000 years.
Databáze:	OpenAIRE
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