Plate Tectonics and Earthquakes

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What is a key difference between the Richter scale and the Mercalli scale?

The Richter scale has a definite end at 12, while the Mercalli scale does not have a set limit. (correct)

The Richter scale is subjective, while the Mercalli scale is objective.

The Mercalli scale is dependent on human development, while the Richter scale is dependent on seismic wave strength.

The Richter scale measures earthquake magnitude, while the Mercalli scale measures earthquake depth.

What factor influences the strength of seismic waves in an earthquake?

The regularity of the earthquake

The predictability of the earthquake

The frequency of the earthquake

The depth of focus (correct)

Which statement accurately describes the occurrence of earthquakes?

Earthquakes can be accurately predicted using microquakes as indicators.

Hundreds of smaller earthquakes occur every day, while larger ones are less common. (correct)

Most earthquakes are large in magnitude and occur infrequently.

Earthquakes follow a predictable pattern and occur at regular intervals.

What causes shockwaves during seismic events?

Friction between plates leading to potential energy buildup Signup and view all the answers

What makes earthquake predictability almost impossible?

Random nature of earthquake strength Signup and view all the answers

Which type of boundaries are likely to have stronger seismic waves due to their proximity to the epicenter?

Conservative boundaries with shallow focuses Signup and view all the answers

What is responsible for the seismic movement spreading throughout the ground?

Convection currents in the asthenosphere Signup and view all the answers

What is the focus of an earthquake?

The point underground where the earthquake originates from Signup and view all the answers

Which scale is used to measure seismicity based on the strength of seismic waves?

Richter Scale Signup and view all the answers

What is the epicenter of an earthquake?

The area above ground directly above the focus Signup and view all the answers

Which belt accounts for 90% of the world's earthquakes?

Circum-Pacific belt (Ring of Fire) Signup and view all the answers

How is earthquake predictability often measured?

By analyzing historical seismic data Signup and view all the answers

Which index is used to measure the magnitude of volcanic eruptions?

Volcanic Explosivity Index (VEI) Signup and view all the answers

What type of volcanic eruptions are characterized by high magnitude and explosiveness?

Explosive eruptions Signup and view all the answers

How are calmer, lower magnitude volcanic eruptions described?

Effusive Signup and view all the answers

Which type of volcanoes erupt constantly, contributing to a higher frequency of eruptions?

Active volcanoes Signup and view all the answers

What does the regularity of volcanic eruptions help in predicting?

Volcanic eruptions Signup and view all the answers

Which scale is logarithmic and starts from VEI 2 for measuring volcanic explosivity?

Volcanic Explosivity Index (VEI) Signup and view all the answers

Plate Tectonics and Earthquakes

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Questions and Answers

What is a key difference between the Richter scale and the Mercalli scale?

What factor influences the strength of seismic waves in an earthquake?

Which statement accurately describes the occurrence of earthquakes?

What causes shockwaves during seismic events?

What makes earthquake predictability almost impossible?

Which type of boundaries are likely to have stronger seismic waves due to their proximity to the epicenter?

What is responsible for the seismic movement spreading throughout the ground?

What is the focus of an earthquake?

Which scale is used to measure seismicity based on the strength of seismic waves?

What is the epicenter of an earthquake?

Which belt accounts for 90% of the world's earthquakes?

How is earthquake predictability often measured?

Which index is used to measure the magnitude of volcanic eruptions?

What type of volcanic eruptions are characterized by high magnitude and explosiveness?

How are calmer, lower magnitude volcanic eruptions described?

Which type of volcanoes erupt constantly, contributing to a higher frequency of eruptions?

What does the regularity of volcanic eruptions help in predicting?

Which scale is logarithmic and starts from VEI 2 for measuring volcanic explosivity?

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