Earthquakes
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each of the black spaces below before clicking
on it to display the answer.
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| Tsunami waves may move faster than ____. | 800 km/hr
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| For most of the 20th century earthquake magnitude was reported on the _______ scale, a scale that has never exceeded a magnitude 8.6. | Richter
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| ____ focus earthquakes are the most common. | Shallow
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| Perhaps 90 percent of the destruction in the 1906 San Francisco earthquake was caused by ____. | fires
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| The time interval between the first arrival of P-waves and the first arrival of S-waves ____ with distance from the focus of an earthquake. | increases
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| The paper record of an earthquake is a ____. | seismogram
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| Although large earthquakes are rare in the central and eastern United States, when they do occur they tend to be very destructive because _______. | the crust there is cool and brittle
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| Faulting and earthquakes are examples of ____________. | brittle behavior
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| In the elastic rebound theory, earthquakes are caused by the sudden release of progressively stored _____ in rocks. | strain
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| ____ are seismic waves that travel through the Earth's interior, spreading out from the focus in all directions. | Body waves
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| A _____ is the first wave to arrive at a recording station following an earthquake. | P-wave
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| A(n) _______ is a seismic sea wave. | tsunami
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| ____ are the waves of energy produced by an earthquake | Seismic
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| _____ is a measure of an earthquake's effect on people and buildings. | Intensity
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| Rupture begins at the _____ and then spreads rapidly along the fault plane. | focus
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| Deep focus earthquakes occur at a maximum depth of ______. | 670 km
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| ______ would be associated with Benioff zones. | All the answers are correct
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| _____ earthquakes probably occur along older faults that are no longer at plate boundaries, for example the New Madrid Missouri earthquakes of 1811-1812. | Intraplate
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| One suggested cause of deep focus earthquakes is ______. | collapse of minerals into denser forms
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| The ______ is the most famous example of a right lateral transform fault. | San Andreas Fault in California
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| A series of earthquakes that occurred near _____ in 1811-1812 were the most widely felt earthquakes to occur in recorded history. | New Madrid, Missouri
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| Deep rocks behave as _____ material under stress rather than breaking. | ductile
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| _____ can occur when water-saturated soil turns from a solid to a liquid as a result of an earthquake. | Liquefaction
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| Both P-waves and S-waves can pass through ____. | solid rock
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| ____ -waves are the slowest body waves. | S
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| The effects of ground motion caused by an earthquake do not include _____. | volcanism
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| ___ stations are the minimum needed to determine the location of an earthquake epicenter. | Three
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| ________ maps are useful for assessing how different areas respond to seismic waves and provide valuable information for earthquake planning. | Intensity
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| Surface waves ____________. | produce most of the damage to buildings during earthquakes
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| Richter scale values above 7 are not accurate. The ______ scale is a more objective method of measuring the energy of a large earthquake. | moment magnitude
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| The point within the earth where seismic waves first originate is the _____. | focus
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| Medium and deep focus earthquakes occur along _______________. | convergent plate boundaries only
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| On the modified Mercalli intensity scale the maximum value is _______. | XII
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| The most important concentration of earthquakes by far is ______. | the Circumpacific belt
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| _____ waves tend to be incredibly destructive to buildings because they produce much ground movement and take a long time to pass. | Rayleigh
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| Which of the following is not used to aid in earthquake prediction? | tsunamis
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| The greatest loss of life in the 1964 southern Alaska earthquake was from _________. | tsunamis
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| A ____ plots seismic-wave arrival time against distance. | travel-time curve
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| Earthquake waves propagate most rapidly through ____________. | igneous rock
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| ____ are earthquake waves that cause the most property damage. | Surface waves
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Created by:
Thomas.Siu
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