EARTH SCIENCE
EARTHQUAKES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It creates stress in rock.
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It develops in the lithosphere.
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It lies above the surface where rock breaks.
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It begins about 5 kilometers below Earth’s surface.
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Detailed explanation-1: -Therefore, the focus of an earthquake is the epicenter.
Detailed explanation-2: -The focus is the place inside Earth’s crust where an earthquake originates. The point on the Earth’s surface directly above the focus is the epicenter.
Detailed explanation-3: -In general, the term “deep-focus earthquakes” is applied to earthquakes deeper than 70 km. All earthquakes deeper than 70 km are localized within great slabs of lithosphere that are sinking into the Earth’s mantle.
Detailed explanation-4: -Most earthquakes are at the boundaries between the plates, where the plates are breaking. Lithosphere responds to large stresses (force per unit area) as if it were a very stiff spring (elastic ). If the stresses get too large the lithosphere breaks (brittle ). Earthquakes are the brittle breaking of the lithosphere.
Detailed explanation-5: -The point at which the Earthquake happens below the Earth’s Surface is the Focus of the Earthquake. At the focus the waves generated and that waves moved in a large area to spread the damage of Earthquake.