首页|期刊导航|中国地震研究（英文版）|Exploration and Research of Deep Crustal Structures in the Zhangzhou Basin and Its Vicinity
中国地震研究（英文版）2006，Vol.20Issue(4)：412-425,14.
Exploration and Research of Deep Crustal Structures in the Zhangzhou Basin and Its Vicinity
Exploration and Research of Deep Crustal Structures in the Zhangzhou Basin and Its Vicinity
摘要
Abstract
The Zbangzhou basin is located at the middle section of the southeast coast seismic zone of the mainland of China. Using high-resolution refraction and wide-angle reflection/refraction seismic profiling of Zhangzhou basin and its vicinity, we have obtained the crustal geometric structure and velocity structure as well as the geometric configuration and structural relationship between the deep and shallow fractures.The results show that the crust in the region is divided into the upper crust and lower crust. The thickness of the upper crust is 16.5km ～ 18.8km, and that of the lower crust is 12.0km～ 13.0km. The upper crust is further divided into an upper and lower section. In the lower section of the upper crust, there is a low-velocity layer with a velocity of about 6.00km/s; the depth of the top surface of the low-velocity layer is about 12.0km, and the thickness is about 5.0km. The lower crust is also divided into an upper and lower section. The depth of Moho is 29.0km ～ 31.8km. There are 6 normal faults in the shallow crust in this region, and most of them extend downwards to a depth of less than 4km, the maximum depth is about 5km.Below the shallow normal faults, there is a conjectural high-dip angle deep fault zone. The fault zone extends downwards till the Moho and upwards into the low-velocity layer in lower section of the upper crust. The deep and shallow faults are not tectonically connected. The combination character of deep and shallow structures in the Zhangzhou basin indicates that the Jiulongjiang fault zone is a deep fault zone with distinct characteristics and a complex deep and shallow structure background. The acquisition of deep seismic exploration results obviously enhanced the reliability of explanation of deep-structural data and the exploration precision of the region. The combination of deep and shallow structures resulted in uniform explanation results. The delamination of the crust and the characteristic of the structures are more precise and explicit. We discovered for the first time the combination characteristics of extensional structures and listric faults in the upper crust. This is not only helpful to the integrative judgment of earthquake risk in Zhangzhou and its vicinity, but also of importance for deepening the knowledge of deep dynamic processes in the southeast coast seismic zone.关键词
High-resolution refraction/Deep seismic wide-angle reflection/refraction/Crustmantle structure/Deep structureKey words
High-resolution refraction/Deep seismic wide-angle reflection/refraction/Crustmantle structure/Deep structure分类
天文与地球科学引用本文复制引用
Zhu Jinfang,Fang Shengming,Zhang Xiankang,Qu Guosheng,Huang Zonglin,Zhang Chengke,Zhao Jinren..Exploration and Research of Deep Crustal Structures in the Zhangzhou Basin and Its Vicinity[J].中国地震研究（英文版）,2006,20(4):412-425,14.基金项目
This research was funded by the 10th Five-Year Key Project of Fujian Province, entitled "Exploration of active fault and seismic risk evaluation in cities in Fujian province". （）
