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Ch.16 (Exam 3)


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