Gravity Method in Geology

<p>Gravity changes according to latitude position (C)</p> Signup and view all the answers

<p>gn(Ф) = 978.031846 (1 + 0.005278895 sin^2(Ф) + 0.000023462 sin^4(Ф)) (D)</p> Signup and view all the answers

<p>21.385 km (C)</p> Signup and view all the answers

<p>Composition of the Earth's crust (A)</p> Signup and view all the answers

<p>It uses variations in the Earth's gravitational field due to density differences. (D)</p> Signup and view all the answers

<p>Astrobiology research (D)</p> Signup and view all the answers

<p>They often detect anomalies such as buried cavities. (A)</p> Signup and view all the answers

<p>The gravitational force becomes four times weaker. (D)</p> Signup and view all the answers

<p>A localized perturbation in the gravitational field due to subsurface mass differences. (D)</p> Signup and view all the answers

<p>The temperature of the surrounding environment (A)</p> Signup and view all the answers

<p>$6.673 × 10^{-11}$ (m³.kg-1.sec-2) (B)</p> Signup and view all the answers

<p>Salt domes (A)</p> Signup and view all the answers

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The average value of gravity on Earth's surface, around 9.8 m/s².

Tiny variations in Earth's gravity caused by density changes in the subsurface, measured in micrometres per second squared (µm/s²).

A unit used to measure gravity differences, equal to 10^-3 cm/s².

The gravity value changing according to latitude due to the Earth being a rotating, flattened ellipsoid.

Variations in gravity caused by local features and formations on Earth's surface.

A mathematical function describing the global gravity variation caused by the flattening and rotation of Earth. Often expressed as gn(Ф).

The radius of Earth at the equator, roughly 6378.160 km.

The radius of Earth at the poles, approximately 6356.775 km.

Gravity prospecting is a method of investigating subsurface geology by measuring variations in Earth's gravitational field.

A gravity anomaly is a localized perturbation in the Earth's gravitational field caused by subsurface density variations.

Gravity anomalies can indicate the presence of features like buried valleys, salt domes, or granite plutons.

The basic principle behind gravity prospecting is Newton's Law of Gravitation, which describes the force of attraction between two objects with mass.

The Universal Gravitational Constant (G) is a fundamental constant used in Newton's Law of Gravitation, representing the strength of the gravitational force.

Micro-gravity surveys are small-scale gravity surveys used to detect features like buried cavities, typically covering areas of hundreds of square meters.

Gravity method can be used for various applications, including hydrocarbon exploration, regional geological studies, and determining the shape of the Earth.

Salt domes are geological structures that have a lower density than surrounding rocks, creating negative gravity anomalies.