Exploration geophysics is an applied branch of geophysics and economic geology, which uses physical methods, such as seismic, gravitational, magnetic, electrical and electromagnetic at the surface of the Earth to measure the physical properties of the subsurface, along with the anomalies in those properties. It is most often used to detect or infer the presence and position …

Geophysical survey is the systematic collection of geophysical data for spatial studies. Detection and analysis of the geophysical signals forms the core of Geophysical signal processing. ... Magnetic techniques, including aeromagnetic surveys and magnetometers. Electrical techniques, including electrical resistivity tomography, induced ...

Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun.The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core: these ...

The term intraplate earthquake refers to a variety of earthquake that occurs within the interior of a tectonic plate; this stands in contrast to an interplate earthquake, which occurs at the boundary of a tectonic plate. Intraplate earthquakes are often called "intraslab earthquakes", especially when occurring in microplates. Intraplate earthquakes are relatively rare compared to the more ...

Project Magnet was a major geomagnetic survey effort from 1951 through 1994. The project originated in the U.S. Navy Hydrographic Office, renamed the U.S. Naval Oceanographic Office (NAVOCEANO), supporting world magnetic modeling and charting. The project used aircraft flying magnetic surveys worldwide.

Uranium mining is the process of extraction of uranium ore from the ground. Over 50 thousand tonnes of uranium was produced in 2019. Kazakhstan, Canada, and Australia were the top three uranium producers, respectively, and together account for 68% of world production. Other countries producing more than 1,000 tonnes per year included Namibia, Niger, Russia, …

Decay routes. Uranium decays to lead via a series of alpha and beta decays, in which 238 U and its daughter nuclides undergo a total of eight alpha and six beta decays, whereas 235 U and its daughters only experience seven alpha and four beta decays.. The existence of two 'parallel' uranium–lead decay routes (238 U to 206 Pb and 235 U to 207 Pb) leads to multiple feasible …

A figure of merit is a quantity used to characterize the performance of a device, system or method, relative to its alternatives.. Examples. Clock rate of a CPU; Calories per serving; Contrast ratio of an LCD; Frequency response of a speaker; Fill factor of a solar cell; Resolution of the image sensor in a digital camera; Measure of the detection performance of a sonar system, …

Geophysics (/ ˌ dʒ iː oʊ ˈ f ɪ z ɪ k s /) is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment, and the use of quantitative methods for their analysis. The term geophysics sometimes refers only to solid earth applications: Earth's shape; its gravitational and magnetic fields; its internal ...

The Witwatersrand Basin is a largely underground geological formation which surfaces in the Witwatersrand. It holds the world's largest known gold reserves and has produced over 40 000 tonnes (1.3 × 10 9 ozt), which represents about 22% of all the gold accounted for above the surface. The basin straddles the old provinces of Transvaal and the Orange Free State, and …