Structural control of the Gagua "Wedge" Zone east of Taiwan Island on the southern Okinawa Trough

作者：Zheng YP^*; Liu BH; Wu JL; Liang RC; Liu CG; Zhang ZM

来源：Science in China - Series D: Earth Sciences , 2005, 48(8): 1165-1174.

DOI：10.1360/03yd0246

• east of Taiwan Island
• Gagua &quot
• Wedge&quot
• Zone
• Okinawa Trough
• structural control

Based on compositive analysis and interpretation of the observed and historical data, the geophysical field characters and structural properties of the Gagua "Wedge" Zone of the sea area east of Taiwan Island and the primary tectonic stress direction and its variabilities of backarc spreading in the southern Okinawa Trough are studied. It is concluded from the study results that the Gagua "Wedge" Zone is structurally consistent with the Gagua ridge and two fault basins on both sides of the Gagua ridge, and adjusts the moving direction and distance of the western Philippine Sea plate to make the northwestward motion of the plate on its east side change to the northward subduction of the plate on its west side so that the primary tectonic stress direction of the Okinawa Trough changed from NW-SE to nearly N-S, which provided the stress source for the Okinawa Trough to enter the second spreading stage.

• 出版日期2005-8
• 单位国家海洋局第一海洋研究所; 中国海洋大学