Name Per Date Earthquake Practice - science webpage

1 name _____Per _____Date _____Earthquake PracticePage 11)Base your answer to the following question on the data table below, which givesinformation collected at seismic stations W, X, Y, and Z for the same of the data have been )S-waves were not generated at the )S-waves cannot travel through )Station W was located on solid )Station W was located on an is the most probable reason for the absence of S-waves at station W?Page 2A)Wave A represents a compressionalwave, and wave B represents a )Wave A represents a shear wave, andwave B represents a )Wave A represents compressionalwaves in the crust, and wave B represents compressional waves in )Wave A represents shear waves in thecrust, and wave B represents shearwaves in the )The diagrams below show demonstrationsthat represent the behavior of two seismicwaves, A and statement concerning thedemonstrated waves is correct?

2 Page 33)The diagram below represents the analysis of a seismogram used to calculate anearthquake's magnitude on the Richter Scale. This seismogram shows the differencein arrival times, in seconds, of the first P-wave and S-wave and the amplitude of theS-wave in diagram below represents how the Earthquake 's magnitude is determined bydrawing a line connecting the difference in arrival times of the P-wave and theS-wave, and the S-wave 4 What is the magnitude of a recorded Earthquake if the difference in arrival times ofthe first P-wave and S-wave is 2 seconds and the S-wave amplitude is 20millimeters?A) ) ) ) )15 minB)12 minC)9 minD)4 min4)A P-wave takes 5 minutes to travel from theepicenter of an Earthquake to a seismicstation.

3 Approximately how many minuteswill it take an S-wave to travel that samedistance?Page 5A)5 minutes 00 secondB)8 minutes 40 secondsC)9 minutes 40 secondsD)21 minutes 20 seconds5)The cross section of Earth below representsa P-wave moving away from an earthquakeepicenter. Seismic station A is shown onEarth's station A, the first P-wave arrives 11minutes 40 seconds after the long after the first P-wave arrives willthe first S-wave arrive?A)10:02:00B)10:09:20C)10:20:40D)1 0:32:006)The arrival time of the first Earthquake P-wave at a seismograph station was10:11:20 (hours:minutes:seconds). If theepicenter of the Earthquake is 8000 kmaway, what was the approximate arrivaltime of the first S-wave from thisearthquake?

4 A)8 minutes 40 secondsB)9 minutes 20 secondsC)11 minutes 20 secondsD)20 minutes 40 seconds7)What is the approximate time differencebetween the first -wave and the first -wave recorded at a seismic station located8000 kilometers from an Earthquake sepicenter?Page 6 Base your answers to questions 8 and 9 on the diagrams below. Diagram 1represents a cross section of Earth and its interior layers. The asterisk (*) shows thelocation of an Earthquake epicenter. Letters A through D are seismic stations onEarth's surface. Diagram 2 shows four seismograms labeled I, II, III, and IV, whichwere recorded at seismic stations A, B, C, and D during the same time 7A)9 minutes 20 secondsB)11 minutes 20 secondsC)20 minutes 40 secondsD)4 minutes 20 seconds8)Station D is 8000 kilometers from the Earthquake epicenter.

5 How long did it take forthe first P-wave to travel from the epicenter to station D?Page 8A)seismogram I - station Aseismogram II - station Bseismogram III - station Cseismogram IV - station DB)seismogram I - station Bseismogram II - station Dseismogram III - station Aseismogram IV - station CC)seismogram I - station Cseismogram II - station Bseismogram III - station Dseismogram IV - station AD)seismogram I - station Aseismogram II - station Dseismogram III - station Bseismogram IV - station C9)Which list correctly matches the seismograms with the seismic stations where theywere recorded?A)12:11:25 and 4000 kmB)12:11:25 and 6000 kmC)12:19:40 and 4000 kmD)12:19:40 and 6000 km10)An Earthquake occurs at 12:02 Aseismic station records the first S-wave at12:19 Which set of data shows theapproximate arrival time of the first P-wave and the distance to the epicenter?

6 Page 9A)B)C)D)11)The block diagram below shows a tectonic plate boundary. Points A and B represent locations on Earth's graph best shows the depths of most major earthquakes whose epicenterslie between A and B?Page 10A)A is closest to the epicenter, and C isfarthest from the )B is closest to the epicenter, and C isfarthest from the )C is closest to the epicenter, and A isfarthest from the )A is the closest to the epicenter, and B is the farthest from the )The diagram below represents threeseismograms showing the sameearthquake as it was recorded at threedifferent seismic stations, A, B, and statement correctly describes thedistance between the Earthquake epicenterand these seismic stations?

7 A)seismic wavesB)depth of Earth's oceansC)electromagnetic radiationD)isobar gradients13)A model of Earth's internal structure isshown of which type of data led to thedevelopment of this model?A)3:25:30 )3:32:23 )3:27:00 )3:39:30 )The arrival of P-waves and S-waves at aseismic station indicated that anearthquake occurred 4,000 kilometers fromthe station. The P-wave arrived at 3:32 When did the Earthquake occur?Answer KeyEarthquake Practice2 Page 111)B2)A3)C4)C5)C6)C7)B8)B9)D10)B11)A12) C13)A14)A