geological ground survey

基本解釋

Consequently, a geological survey of the under-ground, rock structure must be carried out. If it is thought that the rocks in a certain area contain oil, a "drilling rig" is assembled.
因此，僅僅靠研究地層表面，無法確定有關石油，必須對地下的巖石結構進行地質勘測。
ens.ccit.edu.cn
As oil is found deep in the ground, its presence cannot be determined by a study of the surface. Consequently, a geological survey of the underground rocks structure must be carried out.
因為石油深埋在地下，靠研究地面，不能確定石油的有無，因此，對地下巖層結構必須進行地質勘探。
fl.yangtzeu.edu.cn
The geological mapping aimed at tracing the structures of the Sanshandao gold deposit was carried out in the Cangshang Covered Area in 1979, with the ground magnetic survey being the essential work.
本文介紹的是以地面磁法測量為主，于1979年在倉上覆蓋區(qū)，以追索三山島金礦構造為目的地質填圖工作。

Virginia Burkett is the scientist at the U.S. Geological Survey who has analyzed the ground-based measurement of subsidence.
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