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Why is the Moment magnitude scale favored over the Richter magnitude scale?
A) The Richter magnitude is based on older models of seismographs that are no longer used to record earthquakes. B) The Richter magnitude...
Liquifaction, where normally solid material behaves more like a fluid during an earthquake, occurs because ________.
A) cracking in the rocks allows fluids to flow into the area and increase the amount of liquids in the subsurface B) rock...
Aftershocks occur because ________.
A) there are always small earthquakes on major faults, but we do not notice them until there is a large event that makes us aware of them B) seismic energy continues to build up for a period of time after...
A tsunami can occur ________.
A) when an explosive volcanic eruption occurs in someplace like Hawaii or Alaska B) any time there is an earthquake anywhere C) when an earthquake occurs along a coastline like in Japan or Indonesia
Where does a tsunami usually occur?
A) transformfault boundary B) underwater reverse fault C) divergent boundary D) continentalcontinental convergent boundary
On a typical seismogram, ________ will show the highest amplitudes.
A) surface waves B) P waves C) body waves D) S waves
Major earthquakes are often followed by somewhat smaller events known as ________.
A) hyposhocks B) tremors C) foreshocks D) aftershocks
P waves ________.
A) have higher amplitudes than do S waves B) produce the strongest ground shaking C) are faster than S waves and surface waves D) propagate only in solids
When an earthquake occurs, energy radiates in all directions from its source. The source is also referred to as the ________.
A) inertial point B) seismic zone C) focus D) epicenter
The Richter magnitude of an earthquake is determined from the ________.
A) duration of the earthquake B) arrival time of P and S waves C) intensity of the earthquake D) amplitude of the largest seismic wave
Modern seismographs rely on ________ to record the ground motion from an earthquake.
A) density B) inertia C) buoyancy D) mass
Continental rifting has not occurred on Earth since the Triassic. Indicate whether the statement is true or false.
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