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stress is a measure of the average force per unit area of a surface within a solid body on which internal forces act. These internal forces are a reaction to external forces applied on the body.

Therefore a shift in stress happens when there is a change in the direction or amount of external force applied to the solid body.

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How are the terms stress and shift used when discussing systems at equilibrium?

In equilibrium, stress means the manner in which equilibrium is altered, and shift represents which direction the equilibrium will move to compensate for the stress.


What earthquake star point in crust?

Earthquakes usually occur at the boundaries between tectonic plates, where stress builds up as plates shift against each other. This stress is released through sudden movements along faults in the Earth's crust, resulting in an earthquake. The exact point where the earthquake starts, known as the focus or hypocenter, can vary in depth within the Earth's crust.


Why is the earthquake happening?

Earthquakes occur when there is a sudden release of energy in Earth's crust, usually due to the movement of tectonic plates along faults. The build-up of stress in the rocks causes them to break and shift, resulting in seismic waves that we feel as an earthquake.


Why do eathquakes usually occur at plate boundaries?

Earthquakes usually occur at plate boundaries because these are the areas where tectonic plates interact, causing stress to build up as they move past, collide, or pull apart from each other. When the accumulated stress exceeds the strength of the rocks, it releases energy in the form of seismic waves, resulting in an earthquake. Different types of plate boundaries—such as convergent, divergent, and transform—are associated with various earthquake characteristics and magnitudes.


Do earthquakes most often occur at faults that are away from plate boundary?

Earthquakes infrequently occur away from plate boundaries. Most earthquakes occur at plate boundaries because of the stress caused by the interacting plates.