What Causes the Shadow Zone for No S- Wave Arrivals

question 12

Multiple Choice

What causes the shadow zone for no S- wave arrivals beyond epicentral angles of 105°?

• A) All seismographs are located on the near side of the earth.
• B) All shear waves are converted to surface waves at the mantle- core boundary.
• C) The Earth is hollow.
• D) The liquid outer core will not pass shear waves, so any down- going shear wave energy is converted to additional "late" P waves at the mantle- core boundary.

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