Earthquake Waves: Question Preview (ID: 51)

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An abrupt change in the speed of seismic waves is an indication that the
a) waves are going into a material with different properties b) waves are passing through material of the same density c) shear wave has overtaken the compressional wave d) seismic waves are colliding
A characteristic of compressional waves and shear waves is that they both
a) travel faster through more dense solid materials b) travel through liquid and solid materials c) cause rock particles to vibrate in the same direction d) travel at the same speed
Useful information regarding the composition of the interior of the Earth can be derived from earthquakes because earthquake waves
a) travel at different rates through different materials b) change radioactive decay rates of rocks c) travel through the Earth at a constant velocity d) release materials from within the Earth
Compared to the velocity of an earthquake's P-waves, the velocity of the S-waves in the same material is
a) less b) greater c) the same d) none of the above
Which statement best explains why the P-wave of an earthquake arrives at a seismic station before the S-wave?
a) The P-wave has a greater velocity than the S-wave b) The P-wave originates from the earthquake epicenter. c) The S-wave decreases in velocity as it passes through a liquid. d) The S-wave originates from the earthquake focus.
The theory that the outer core of the Earth is composed of liquid material is best supported by
a) seismic studies which indicate that shear waves do not pass through the outer core b) seismic studies which show that compressional waves can pass through the outer core c) density studies which show that the outer core is slightly more dense than the inner core d) gravity studies which indicate that gravitational strength is greatest within the core
Earthquake S-waves do not travel through the Earth's
a) core b) mantle c) moho d) crust
Which conclusion based on the analysis of seismic data supports the inference that the Earth's outer core is liquid?
a) S-waves are not transmitted through the outer core. b) S-waves are transmitted through the outer core. c) P-waves are not transmitted through the outer core. d) P-waves are transmitted through the outer core.
Which of the following earthquake waves can travel through both solids and fluids?
a) P-waves, only b) S-waves, only c) S-waves and P-waves d) Q-waves
What usually causes tsunamis?
a) undersea earthquakes b) the collision of ocean currents c) high-pressure weather systems d) hurricanes
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