The Dabie Shan marks the collision zone between the Sino-korean and the Yangtze craton with exposed ultra-high pressure metamorphic complexes. This region was considered as a possible drill site in the framework of the ICDP project. In spring 1997 a joint Chinese-German seismic project was carried out to investigate this region. The main objective of this project was to reveal the structure of the Earth's crust down to the Moho to understand the processes which are connected with the process of the triassic collision. The seismic line was located west of the town of Qianshan and had a length of about 25 km. Altogether more than 300 seismic channels were deployed with a spacing of 100 m. Along the line 112 shots (charge size 50 kg) with an average spacing of 200 m were recorded resulting in an actual CDP fold of 25. The spread was designed in such a way that besides conventional CDP observations being possible, simultaneously a tomographic investigation of the upper crust was possible.
Methods & Equipment