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Understanding Earthquakes

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Questions and Answers

What causes an earthquake?

Movement of tectonic plates

Propagation of mechanical energy through the atmosphere

Convection within the Earth's mantle

Release of energy within the earth's crust (correct)

How do scientists measure the behavior of earthquake waves?

By studying the behavior of animals before an earthquake

By analyzing cloud formations after an earthquake

Using delicate instruments called seismographs (correct)

Using satellites to track wave movements

Where do most earthquakes occur?

Along boundaries between different tectonic plates (correct)

Deep within the Earth's core

On the surface of the moon

In the Earth's uppermost mantle

What primarily drives the motion of tectonic plates?

Convection within the mantle Signup and view all the answers

Why can earthquakes occur anywhere on the surface of the Earth?

Because they occur within the crust of the Earth Signup and view all the answers

What type of stress is generated by rock pulling apart from each other?

Tensional stress Signup and view all the answers

What is the main trigger for volcanic earthquakes?

Volcanic activity Signup and view all the answers

What is the stage where the fault suddenly ruptures and releases the stored energy?

Earthquake Signup and view all the answers

What is the stress generated by two objects sliding past and against each other?

Shear stress Signup and view all the answers

Which type of earthquake is caused by an explosion in an underground cave or mine?

Collapse Signup and view all the answers

What is the geographic location and depth where an earthquake starts called?

Focus Signup and view all the answers

Which type of seismic wave causes elliptical shaking of the Earth and gets weaker with depth?

Rayleigh waves Signup and view all the answers

What type of fault experiences vertical motion with one block moving upwards relative to the other?

Thrust or Reverse Faults Signup and view all the answers

What is the most common cause of tectonic earthquakes?

Plate tectonics and faults in the earth's crust Signup and view all the answers

Which seismic wave type arrives at seismographs first and oscillates in the direction the wave travels?

Primary (P-) waves Signup and view all the answers