Sisäpistemenetelmät

Sisäpistemenetelmät refers to a category of geological exploration techniques used to determine the subsurface structure and composition of the Earth. These methods involve placing measurement devices directly into boreholes or shallow excavations to gather data. The primary goal is to obtain direct physical samples or measurements from within the ground, as opposed to surface-based geophysical surveys.

Common sisäpistemenetelmät include drilling and sampling, where core samples or disturbed soil samples are extracted for laboratory analysis. These analyses can determine mineral content, soil type, water saturation, and other physical properties. Another technique is borehole logging, which utilizes probes lowered into boreholes to measure various parameters such as resistivity, natural radioactivity, temperature, and acoustic properties of the surrounding rock or soil formations. Downhole geophysics, a subset of borehole logging, employs seismic or electrical methods to image the subsurface around the borehole. Permeability and groundwater testing, such as pumping tests or slug tests, are also considered sisäpistemenetelmät as they involve direct interaction with the subsurface water system through wells. These methods provide valuable, detailed information for a wide range of applications, including mineral exploration, groundwater resource assessment, geotechnical investigations for construction, and environmental site characterization.