Magnetism, in physics, is the event of a force of pull or thrust on other bodies of an object. In the magnetic method, changes in the magnetic field of the earth are examined.The vertical component of the earth magnetic field, its horizontal components, or the slope and deflection angles can be measured by the field vector. In applications, the total magnetic field or vertical components are usually measured.
Minerals in rocks acquire magnetic properties depending on the magnetization force of the Earth. The purpose of the magnetic method is to determine different rocks based on differences in the magnetization properties of rocks. Magnetic field strength in a region of the changes in the magnetic field of the place with the volume and magnetic suspensibility of rocks in that region (sensitivity) is the result. If the magnetic field in the region is determined, the magnetic intensity of the rocks there can be directly measured. Magnetic research can be carried out by land, ship or aircraft. Magnetic field strength is measured by magnetometer.
The magnetic field of the Earth changes over time. These changes can be instantaneous, daily, or hundreds of years old. The daily changes that occur as a result of magnetic storms caused by the sun are important and these changes are corrected and their effects are eliminated in magnetic prospections. As a result of these corrections, the anomalies arising from magnetic storms in that region are removed and the geological cause of anomalies are attempted to be found. After the necessary corrections are made according to the measured magnetic field intensity component values, the anomaly map is prepared from these values and interpretations are made according to this map.
Typical Applications of Magnetic Methods
- Search for buried structures
- Determination of pipelines, cables and toxic waste
- Unexploded military ammunition
- Abandoned oil wells
- Archaeological structures
- Investigation of geological structures in waste areas
- Mine searches
- Determination of fault lines
- Sediment thickness studies
- Basic rock research
- Continental gliding and seafloor spreads