Geology SS. Three types of seismic waves are shown on the fire aoe. X iw a. Not

Question

Geology

SS. Three types of seismic waves are shown on the fire aoe. X iw a. Not a type of wavwe b. A sarface wave c. An electric wave d. A secondary (S) wave A primary (P) wave 59. The time interval designated as Ts-Tp in the figure shove a. Determine the rock type that the waves are traveling through b. Determine the intensity of the earthquake c. Determine the magnitude of the earthquake d. Determine the speed of the seismic waves e. Determine the distance to the epicenter 60. On the figure above, Y is: a. Not a type of wave b. A surface wave c. A water wave d. A S wave e. A P wave 61. The location of an epicenter can be determined by a. Measuring the difference in arrival time between the P and S wave at a single seismic station b. Measuring the orientation of surface waves C. Measuring the magnitude of the earthquake at different locations d. Drawing circles around three seismic stations, the radius of the circles corresponds to the diffcrence in arrival times of P and S waves e. Drawing circles around two seismic stations, the radius of the circles corresponds to the difference in arrival times of P and S waves 62. Surface waves: a. Have a slower velocity than P and S waves b. Travel along the surface of the earth c. Are the last wave to be detected d. Cause the most amount of destruction of any of the wave types e. All of the above

Explanation / Answer

58) In the above figure, X is the Surface wave as the time taken for the Surface waves to travel is the highest and they are the ones to cause the motion in the surface of the earth causing earthquakes. The fetality of the earthquake is measured by the magnitude of these surface waves. Therefore the option (a) is correct for this question.

59) The time interval between the S and P waves designate the variation of the noise with respect to the time which generally gives us the distance of the place from the epicenter. Therefore the option (e) is correct for this question.

60) Y is the first wave which arrives in the seismic graph and hence are called Primary waves (P waves).

61) The location of the epicenter(which is considered to be the point where the earthquake originates above the surface of the earth) can be determined by a method called the Triangulation method. This method generally involves by drawing 3 circles of the radius estimated by the time interval between the S and P waves in various places. The point where the 3 circles get intersected at a specific point is considered to be the epicenter of the earthquake. Therefore the option (d) is correct for this question.

62) Every option in this question correct as because the surface waves are usually the last and dealiest of all the seismic waves. And as mentioned earlier that the magnitude or the amount of the destruction caused by the earthquake depends upon the Intensity of the surface waves. Therefore all of the options in this question is correct.

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