Exam 8: Earthquakes and Earths Interior

On the Richter Scale,an earthquake of 6.0 releases ten times as much energy as an earthquake of 5.0.

The percentage of all earthquakes that occur along a plate boundary is nearly:

Compare the continental crust with oceanic crust in terms of composition and thickness.

Describe what seismographs do and how they work.

Why are there so few earthquakes within plate interiors?

What is an earthquake? What are aftershocks?

The most damage from the 1906 San Francisco earthquake was caused by:

The major boundary that occurs at a depth of about 30 km below Earth's surface is the:

Why has it been suggested that large earthquakes might be prevented by injecting water along isolated portions of fault zones that have been inactive for an unusually long time? When was this technique discovered?

Why are the paths of seismic waves curved?

An earthquake of magnitude 7.0 has an amplitude ____________________ times as large and releases ____________________ times as much energy,respectively,as a magnitude 6.0 earthquake.

The type of building construction and population density in the area of an earthquake are factors that can affect the intensity on the Modified Mercalli Intensity Scale.

The opening of large fissures that swallow people is a significant source of danger created by earthquakes.

What causes tsunamis,and why are they so destructive?

Which type(s)of seismic waves do seismographs record?

Why do structures located on thick,soft sediment,especially water-saturated or artificial fill,suffer much greater damage than structures built on bedrock?

What are the focal depth ranges for shallow-focus,intermediate-focus,and deep-focus earthquakes?

Explain the differences between the magnitude and the intensity of an earthquake,in terms of how many intensities and magnitudes a single,given earthquake can have.

The term that best describes a tsunami is not "tidal wave" but ____________________.

The average geothermal gradient near Earth's surface is: