EARTH SCIENCE
EARTHQUAKES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A measurement of an earthquake’s magnitude and its strength based on seismic waves and movement.
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The point on the Earth’s surface directly above the focus.
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The point beneath the Earth’s surface where rock under stress breaks to cause an earthquake.
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None of the above
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Detailed explanation-1: -The epicenter is the point on the Earth’s surface directly above the focus. 6. Figure 18.3: When the two blocks on either side of a fault plane suddenly slip, the energy travels outward from the focus as intense vibrations called seismic waves . These waves cause the ground near the epicenter to shake violently.
Detailed explanation-2: -Scientists use triangulation to find the epicenter of an earthquake. When seismic data is collected from at least three different locations, it can be used to determine the epicenter by where it intersects. Every earthquake is recorded on numerous seismographs located in different directions.
Detailed explanation-3: -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. When energy is released at the focus, seismic waves travel outward from that point in all directions.
Detailed explanation-4: -The location below the earth’s surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter.
Detailed explanation-5: -Epicenter: The point on the surface, nearest to the focus, is called the epicenter.