对冲绳海槽中部南奄西、伊平屋、伊士名三个现代海底热液活动区的地形、热流分布、地震、地磁场特征进行了初步研究。结果表明 ,海槽中部的热液活动区都集中于海槽的中央地堑中 ,或位于火山口的侧坡上 ,或位于地堑中山脊的侧坡上 ,热流值高而变化大 ,地震事件十分上频繁 ,地磁场曲线变化较大。这一系列特征说明现代海底热液活动区和目前的构造活动带吻合 ,热液活动和岩浆作用或浅成岩浆房密切相关。板块俯冲在海槽下诱生地幔物质上涌 ,上涌的地幔物质所携带的热量为热液活动提供了动力源 ,在海槽拉张过程中形成的断裂为热液流体提供了运移通道 The characteristics of topography, heat flow distribution, earthquakes and geomagnetic field of three modern seafloor hydrothermal activity areas in the southern Amayan Sea, Yuping Bay and Yushi Lake in the central part of the Okinawa Trough were studied. The results show that the hydrothermal activity areas in the central part of the trough are concentrated in the central graben of the trough or on the side slope of the crater or on the side slope of the middle ridge of the graben. The heat flow is highly variable and varies greatly. Very frequent, the magnetic field curve changes. This series of features shows that the modern seafloor hydrothermal activity zone is closely related to the current tectonic activity belt, hydrothermal activity and magmatic action or shallow magmatic chamber. Plate subduction induces upwelling of mantle material under the trough, and the heat carried by the upwelling mantle material provides a source of motivation for hydrothermal activity. The fractures formed during the extension of the trough provide migration channels for hydrothermal fluids