菲律宾海的地势特征

TERRAIN FEATURES OF THE PHILIPPINE SEA

菲律宾海位于西太平洋大陆边缘,它的周边被岛弧和深海沟所环绕,海域内有数条近南北向的构造脊。近南北向和近东西向的构造将菲律宾海海底地势分割成不同的部分,构成明显不同的地势特征:(1)深海沟呈链状环绕着海域周边分布。(2)近南北向的九州 帛琉海岭将海底分成东西两半,东半部主要是岛弧区,西半部主要是海盆区。(3)海脊与岛弧呈近南北向伸展并贯穿全区,海脊与岛弧之间为海盆。海盆底多为丘状起伏,并有轻度切割。(4)海岭、海台呈块状分布在海盆之上,长垣分布在菲律宾海沟的东侧。(5)岛弧周围分布有岛架和岛坡地势。菲律宾海的地势特征和它的构造特征相一致。

The Philippine Sea surrounded by island arc and deep trench is located at the continental margin of the West Pacific,in which some tectonic ridges in the S N direction are developed. The tectonic zones in the S N and E W directions divide the Philippine Sea into many parts with different terrain features.(1)The deep trench chains surround the Philppine Sea.(2)The Kyushu Palau Ridge extending in the S N direction divides the Philippine Sea into two parts,the east part develops into many submarine ridges and the West develops into deep basins mainly.(3)Submarine ridges and island arcs extend approximately in the S N direction,among which some basins developed,the bottoms of the basirs are very rough and cut by faults.(4)Some uplifts developed at the bottom and long hills developed at the east side of the Philippine Trench.(5)At both sides of the island arc,the islandshelf and island slope are developed well.The terrain feature shows the same characteristics as the tectonic outline.