EARTH SCIENCE
EARTHQUAKES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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seismic waves from a focus near the surface
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seismic waves originating from a divergent boundary
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Click to view seismic waves from a focus deep underground
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None of the above
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Detailed explanation-1: -They are typically generated when the source of the earthquake is close to the Earth’s surface. Although surface waves travel more slowly than S-waves, they can be much larger in amplitude and can be the most destructive type of seismic wave.
Detailed explanation-2: -S waves arrive next and cause a structure to vibrate from side to side. They are the most damaging waves, because buildings are more easily damaged from horizontal motion than from vertical motion.
Detailed explanation-3: -Shallow earthquakes cause the most damage. This is because the focus is near the Earth’s surface, where people live.
Detailed explanation-4: -Ground shaking is the vibration of the ground during an earthquake. The shaking triggers other hazards such as liquefaction and landslides. Most earthquake damage results from the seismic waves passing beneath buildings, roads, and other structures.
Detailed explanation-5: -Surface waves travel along the surface. There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake.