The Philippine Sea is a well-preserved, relict, marginal basin (Figure 1), which was formed principally by seafloor spreading during the Paleogene, with the former spreading axis along the Central Ridge Fujioka et al., 1999;Louden, 1976;Uyeda & Ben-Avraham, 1972). The water depth rage of the Philippine Sea (∼5,500-6,000 m), is generally below the carbonate compensation depth (CCD). Magnetic anomalies in the Philippine Sea were identified based on total-force anomalies (Louden, 1976;Mrozowski et al., 1982),
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