Earthquake homework help

Week Two Lab Report Worksheet GLG/220 Version 4 1 University of Phoenix Material Week Two Lab Report Worksheet Week Two Earthquakes Lab Report From Geoscience Laboratory, 5th ed. (p. 165), by T. Freeman, 2009, New York, NY: John Wiley & Sons. Reprinted with permission. Week Two Lab Report Worksheet GLG/220 Version 4 P arrival time 2 S arrival time (hours:minutes:seconds.tenths of seconds) Difference in P & S arrivals Distance in kilometers (seconds.tenths of seconds) LTN GOIL POW From Geoscience Laboratory, 5th ed. (p. 165), by T. Freeman, 2009, New York, NY: John Wiley & Sons. Reprinted with permission. Week 2 Earthquakes Lab Report GLG/220 Version 4 1 University of Phoenix Material Week 2 Earthquakes Lab Report Answer the lab questions for this week and summarize the lab experience using this form. Carefully read Ch. 9 of Geoscience Laboratory. Pay special attention to the graphs and figures. Complete this week’s lab by filling in your responses to the questions from Geoscience Laboratory. Select answers are provided for you in red font to assist you with your lab work. Although you are only required to respond to the questions in this worksheet, you are strongly encouraged to answer the other questions from the text on your own; doing so will make answering the required questions easier. Questions and charts are from Geoscience Laboratory, 5th ed. (pp. 155–167), by T. Freeman, 2009, New York, NY: John Wiley & Sons. Reprinted with permission. Lab Questions 9.1. Judging from the seismogram in Figure 9.4 of the lab book, which wave appears to be the most damaging? Take a look at Figure 9.4 and 9.5 which are reproduced below. Remember that an earthquake produced both P and S waves, but these waves arrive at a seismic station at different times. Figure 9.5 plots the information (dashed lines indicating travel-time and a seismogram image) for an earthquake with a difference in arrival times of P and S of 7.2 minutes (question 9.3 will ask you to think about P and S waves that arrive 5 minutes apart). Note. The S-wave arrival time is erroneously labeled as 16. Please note that it is actually 16.7. (This is corrected below.) 9.3. Determine the distance to an earthquake at a station that receives P and S waves 5.0 minutes apart. Refer to the Figures 9.4 and 9.5, reproduced below. Hint: (a) Place tick marks on a scrap of paper equal to 5.0 on the minutes axis. (b) Fit that to the horizontal separation between P and S curves. (c) Read distance directly across on the distance axis. Remember your goal is to find where the P and S wave curves are 5 minutes apart. The scrap of paper is helpful when you find where the P and S curves are 5 minutes apart—then you can follow you piece of paper over to the vertical axes (distance traveled) and see how many kilometers the earthquake station is from the earthquake. Copyright © 2015 by University of Phoenix. All rights reserved. Week 2 Earthquakes Lab Report GLG/220 Version 4 2 From Geoscience Laboratory, 5th ed. (p. 155), by T. Freeman, 2009, New York, NY: John Wiley & Sons. Reprinted with permission. Copyright © 2015 by University of Phoenix. All rights reserved. Week 2 Earthquakes Lab Report GLG/220 Version 4 3 From Geoscience Laboratory, 5th ed. (p. 155), by T. Freeman, 2009, New York, NY: John Wiley & Sons. Reprinted with permission. 9.4. At this point, from the information in Figure 9.6A, how specific can you be as concerns the location of that earthquake? Answer: The earthquake is somewhere on the circle around Seattle (Hint: You can be more specific with regards to the location when you have information from more than one seismic station). 9.5. At this point, from the information in Figure 9.6B, how specific can you now be as concerns the location of that earthquake? 9.6. At this point, from the information in Figure 9.6C, how specific can you now be as concerns the location of that earthquake? 9.7 The effect of value III in Table 9.1 is ‘Felt indoors.’ Why specify indoors? Why should eye witness accounts indoors differ from eye witness accounts outdoors? Hint: Consider the surroundings. Copyright © 2015 by University of Phoenix. All rights reserved. Week 2 Earthquakes Lab Report GLG/220 Version 4 9.10. 4 Using the nomogram, determine the Richter magnitude for the three earthquakes listed (see p. 169 of Geoscience Laboratory). S arrival minus P arrival Amplitude (A) 8 seconds (B) 8 seconds (C) 6 seconds 20 millimeters 0.2 millimeters 10 millimeters Magnitude 9.14. The 2002 Afghanistan earthquake measured 5.9 on the Richter scale and killed 1,800 people.