# A ____________ earthquake has a focus gt; 200 miles deep. shallow focus b. intermediate focus c. deep focus d. epicenter GEOLOGY C105 – 66 – 62.

61. A ____________ earthquake has a focus > 200 miles deep. a. shallow focus

b. intermediate focus

c. deep focus

d. epicenter

GEOLOGY C105 – 66 –

62. ______ is the theory that rocks store energy by deforming and then release it as seismic waves. a. elastic rebound

b. triangulation

c. expanding earth

d. contracting earth

63. _______ is the surface point directly above a quake’s focus. a. Seismogram

b. Magnitude

c. Epicenter

d. shake map

64. A_______ earthquake has a focus 40-200 miles deep a. shallow focus

b. intermediate focus

c. deep focus

d. epicenter

65. An earthquake with a focus <40 miles deep is called ____________ a. shallow focus

b. intermediate focus

c. deep focus

d. epicenter

66. The method of locating a quake’s epicenter is called _______. a. shake map

b. Triangulation

c. Magnitude

d. intensity

67. A zone along subducting plates where intermediate and deep focus earthquakes occur is called ______ . a. Epicenter

b. Focus

d. Mercalli

68. ________ is recorded on a seismogram and shows the amount of energy released as evidenced by ground movement. a. Intensity

b. Focus

c. Epicenter

d. magnitude

– 67 – GEOLOGY C105

69. A twelve point scale that measures an earthquake’s intensity or impact on humans and objects is the _______. a. Mercalli intensity scale b. Modified Mercalli scale c. Moment Magnitude scale d. Local Magnitude scale

70. ______ is a refinement of the Local Magnitude Scale that more accurately expressed large magnitudes. a. Mercalli intensity scale b. Modified Mercalli scale c. Moment Magnitude scale d. Shakemap

71. A _______ is a diagram arranging different scales so that values on two can determine the value of a third. It is used to determine an earthquake’s magnitude from known distance and wave amplitude values. a. triangulation b. shake map c. nomograph d. seismogram

72. _____ is a logarithmic scale expressing the magnitude of an earthquake. Each whole number increment represents a tenfold difference in earth movement. a. Mercalli intensity scale b. Modified Mercalli scale c. Moment Magnitude scale d. Local Magnitude scale

73. ______is a map in which shadings correspond to Mercalli values, providing a visual image of the relative amount of shaking in areas affected by an earthquake. a. triangulation b. shake map c. nomograph d. seismogram

74. As you stretch a rubber band it stores_________energy. a. elastic strain b. compression c. brittle strain d. shear

75. How many seismic recording stations are needed to locate the epicenter of an earthquake? a. only one

b. just two

c. only three

d. four or more

GEOLOGY C105 – 68 –

76. Each step on the Local Magnitude Scale represents a ________ increase in the amount of energy released experienced as a ten-fold increase in shaking. a. 5 fold b. 30 fold c. 100 fold d. 1000 fold

77. Near the zone of _________ earthquake data may help define the contact between the top of the diving plate and the bottom of the over-riding plate. a. Rift

b. Divergence

c. Subduction

d. tension

78. Rocks deeper into the crust become more _______ as the depth increases. a. Brittle

b. plastic

c. Solid

d. fractured

79. The ____ ______ is the actual location of the earthquake, often miles below the surface. a. Wadati-Benioff zone

b. Focus

c. Epicenter

d. magnitude

80. Why are there more shallow focus earthquakes than deeper focus earthquakes? a. Rocks are more brittle near the surface and become more plastic with increasing depth.

b. Rocks are more plastic near the surface and become more brittle with increasing depth.

c. Rocks are more ductile near the surface and become more brittle with decreasing depth.

d. Rocks are more elastic near the surface and become more brittle with decreasing depth.

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