There is a wide variety of geophysical techniques used around the world for information underground, some of them are: RESISTIVITY (ELECTRICAL); MAGNETIC; ELECTROMAGNETIC; GPR (ground penetrating radar); SEISMIC; GRAVITY; VIBRATION CONTROL; MARINE SURVEYS; GENERAL purpose ETC.: Geological studies, stratigraphy, study of marine beds, mechanical properties of the subsoil, location of groundwater, mining, environment, location of pipelines and facilities, geological faults, and among other search for TREASURES and archaeology.
It is the method that allows us to have a continuous flow of information from under the surface, the high accuracy of this technique provides many data quickly and at low cost.
It is a non-destructive method that produces information without digging, is used to assess the location and depth of buried objects, operates by transmitting pulses of high frequency Radiowaves to Earth through a transducer or antenna, the transmitted energy is reflected by buried objects or contacts between different layers of materials on Earth the antenna then receives the reflected waves and stores the data in the control unit.
Currently the G.P.R.(ground penetrating radar) is used in: Archaeology, environment, geology, forensic applications, localization of underground water, military applications, real estate, location of tunnels, pipelines and facilities, engineering and treasure hunting.
METAL detectors: There are basically three types according to their principle of operation; BFO (beat frequency oscillator); IB (induction balance) and; PI (pulse induction), but we will classify them according to their characteristics.
DETECTORS FOR SURFACE SEARCH:
DISK DETECTORS; Also known as plate detectors, do not offer great depth but if much sensitivity, detect objects as small as a PIN or gold nuggets even.
In discrimination mode can give an idea of the detected material provided East very superficial, are ideal for walls or tight spots, lookups also are very seldom used in the beaches.
DETECTORS FOR DEEP SEARCH:
TWO BOX DETECTORS AND DETECTORS OF PULSE; They are very powerful and little sensitivity detectors, in two cases only detect objects the size of a can up, which is an advantage to skip garbage as Crown caps, nails and wire, both work to all metal but of pulse can discriminate between ferrous and non-ferrous metals, both types of detectors are very useful in open terrain where quickly cover large areas, but because of its power are not practical if it is to operate them inside a property, especially if it is modern and is inhabited and full of furniture and installations that activated at each moment that comes close to them.
We mention these technologies to be of the more used, although there are many more, some of doubtful effectiveness and without scientific basis, but which are used widely, such as dowsing, which has its detractors but many more followers.