Linear magnetic anomalies and tectonic development for the middle Okinawa Trough

Linear magnetic anomalies have been found in the middle Okinawa Trough,it means that the continental crust has broken in the extension axis,oceanic crust has been formed.There is a three extension phases model in the Okinawa Trough,namely,"doming" from middle Miocene to early Pliocene (Phase Ⅰ),"extension" from Pliocene to early Pleistocene (P hase Ⅱ),and recent "spreading" (Phase Ⅲ).The magnetic anomalies for the middle Okinawa Trough are very similar to those found in the Red Sea,which shows that developing of the Okinawa Trough is going to "Red Sea stage".Being similar to the Red Sea,there area "main trough" and a "axial trough" in the Okinawa Trough.