Introduction to Exploration Geophysics: Part 1 (Survey Methods) скачать в хорошем качестве

Introduction to Exploration Geophysics: Part 1 (Survey Methods)

Exploration geophysics is an applied branch of geophysics, which uses physical methods at the surface of the Earth to measure the physical properties of the subsurface, along with the anomalies in those properties. Geophysics on the other hand is the branch of Earth science that deals with the physical properties of rocks and minerals. Geophysical data can be used indirectly to map some geological features in detail, including contact between rocks, faults, shear zones, folds, alteration zones and other structures. Geophysics is an integral part of most mineral exploration programmes, both at greenfield and brownfield. It is widely used because it can map large areas quickly and cost effectively, delineate subtle physical variations in the geology that might otherwise not be observed by field geological investigations. Geophysical methods include: Seismic, gravitational, magnetic, electrical and electromagnetic. These methods identify resources without the need for sampling. Usually undertaken with minimal surface disturbance. The survey used in these methods is called geophysical survey. Geophysical surveys can be conducted either from the air or airborne, on the ground, or down drill holes.