Understanding Earthquakes and Tsunamis

How do tectonic processes lead to earthquakes?

• By generating tsunamis directly.

• By releasing stress when rock masses move along faults.

• By creating volcanoes on plate boundaries.

• By causing soil liquefaction.

What is the focus of an earthquake?

• The point on the Earth's surface directly above the epicenter.

• The origin point of seismic waves within the Earth's crust.

• The highest point of ground shaking.

• The location where tsunamis begin.

What is the epicenter of an earthquake?

• The deepest point of the earthquake.

• The point where seismic waves are released.

• The point on the Earth's surface directly above the focus.

• The location farthest from the earthquake.

What device is used to measure seismic waves?

• Seismometer

• Barometer

• Anemometer

• Thermometer

The Richter Scale measures an earthquake's magnitude based on:

• The duration of ground shaking.

• The size of the largest seismic wave recorded.

• The total energy released by the earthquake.

• The distance from the epicenter.

Why is the Moment Magnitude Scale (Mw) preferred over the Richter Scale?

• It measures the total seismic intensity.

• It is logarithmic and easier to use.

• It measures the total energy released during an earthquake.

• It can measure local earthquakes better.

Which region is known as the most seismically active zone in the world?

• Mid-Atlantic Ridge

• Himalayan Region

• Pacific Ring of Fire

• East African Rift

Convergent plate boundaries are associated with:

• Plates sliding past each other.

• Plates moving toward each other.

• Plates moving away from each other.

• No seismic activity.

What causes soil liquefaction during an earthquake?

• Loose, saturated soil losing its structure.

• Violent tsunamis shaking the ground.

• High-magnitude landslides.

• Collapse of tectonic plates.

How do landslides affect human systems?

• They can bury villages and farms.

• They disrupt essential services.

• They can cause injuries and fatalities.

• All of the above.