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The Philippine Sea: New survey results reveal the structure and the history of the marginal basins
Author(s) -
Okino Kyoko,
Ohara Yasuhiko,
Kasuga Shigeru,
Kato Yukihiro
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900537
Subject(s) - escarpment , bathymetry , lineament , geology , hydrography , structural basin , geophysical survey , oceanography , magnetic survey , paleontology , magnetic anomaly , geophysics , tectonics
The Hydrographic Department of Japan initiated a long‐term geological and geophysical survey of the Philippine Sea in 1983. We here summarize the bathymetry and magnetic anomalies of this area, focusing on the structure and the evolutionary process of the marginal basins. The Shikoku and Parece Vela Basins developed as one backarc system in the later phase of their formation; the significant difference between the two basins, however, is clearest near the extinct spreading centers. The steep Oki‐Daito Escarpment, located in the northern West Philippine Basin, was mapped for the first time during this survey. The N‐S trending spreading fabric north of the escarpment is in striking contrast to the NW‐SE to E‐W lineament in the south. Our data reveal a more complicated history of the western Philippine Sea than has been proposed in previous studies.