EARTH SCIENCE
EARTHQUAKES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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S-waves are transmitted through the outer core, but P-waves are not transmitted.
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P-waves are transmitted through the outer core, but S-waves are not transmitted.
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Both P-waves and S-waves are transmitted through the outer core.
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Neither P-waves nor S-waves are transmitted through the outer core.
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Detailed explanation-1: -S waves cannot pass through the liquid outer core, but P waves can. The waves are refracted as they travel through the Earth due to a change in density of the medium. This causes the waves to travel in curved paths.
Detailed explanation-2: -P-waves speed up again through the inner core and S-waves also travel through it, suggesting that the inner core is composed of solid iron and nickel. 3. Figure 19.10: The increase of temperature with depth in the earth is indicated by a curve called the geotherm.
Detailed explanation-3: -Seismic waves move more slowly through a liquid than a solid. Molten areas within the Earth slow down P waves and stop S waves because their shearing motion cannot be transmitted through a liquid. Partially molten areas may slow down the P waves and attenuate or weaken S waves.
Detailed explanation-4: -Note that P waves pass through all layers of the earth, while S waves cannot pass through the solid core of the earth, resulting in an S wave shadow on the opposite side of the earthquake.
Detailed explanation-5: -With increasing distance from the earthquake the time difference between the arrival of the P waves and the arrival of the S waves increases.