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Question

What are 2 possible reasons of an earthquake at the converging plate boundary ?

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Solution

A convergent boundary, also known as a destructive plate boundary, is a region of active deformation where two or more tectonic plates or fragments of the lithosphere are near the end of their life cycle. At convergent plate boundaries, where two continental plates collide, earthquakes are deep and also very powerful. In general, the deepest and the most powerful earthquakes occur at plate collision (or subduction) zones at convergent plate boundaries. As a result of pressure, friction, and plate material melting in the mantle, earthquakes are common near destructive boundaries.

1)The buildup of friction (thus potential energy) between both converging plates.

As one plate subducts beneath the other, there is an incredible amount of friction between the two. The plates sort of "lock" into each other, while each is still moving toward each other. Eventually, something has to give way, and that "lock" breaks. This locked zone then becomes the rupture zone (also known as the hypocenter of the earthquake). This friction gets converted from potential to kinetic energy when the plates slip, releasing a large amount of energy.

2)The pressure of the plates rubbing against one another

Transform boundaries are where plates slide past one another. Also called faults, they usually happen where two ocean or two continental plates meet. They are most common on the ocean floor. These plates are colliding with huge force, causing one to slowly grind over, under or alongside the other. As the brittle crust gives way under the pressure, a fault ruptures and an earthquake is unleashed. The pressure of these plates rubbing against one another often causes frequent earthquakes that range from mild to severe.


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