SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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an earthquake with a deep focus and a magnitude of 2.5
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an earthquake with a shallow focus and a magnitude of 2.5
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an earthquake with a deep focus and a magnitude of 4.5
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an earthquake with a shallow focus and a magnitude of 4.5
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Detailed explanation-1: -Surface waves, in contrast to body waves can only move along the surface. They arrive after the main P and S waves and are confined to the outer layers of the Earth. They cause the most surface destruction.
Detailed explanation-2: -The destructive effects of earthquakes are from landslides, tsunamis, fires, and fault rupture. The violent shaking of the ground produces the greatest property losses and personal injuries.
Detailed explanation-3: -Earthquakes less than 70 km deep are classified as shallow-focus. Earthquakes with foci 70–300 km deep are classified as intermediate-focus and those below 300 km are. Shallow-focus earthquakes occur more often than deeper ones; about 75% of the total energy released from earthquakes is from shallow-focus ones.
Detailed explanation-4: -Shallow earthquakes are between 0 and 70 km deep; intermediate earthquakes, 70-300 km deep; and deep earthquakes, 300-700 km deep. In general, the term “deep-focus earthquakes” is applied to earthquakes deeper than 70 km.