Activity 4 (copy)

Activity 4 Last Name: First Name: Student ID: Question 1) Which of the following sequences correctly lists the different arrivals from first to last? Mark: 0.3 □ Surface waves ... P waves ... S waves □ P waves ... Surface waves ... S waves □ P waves ... S waves ... Surface waves 2) How do rock particles underground move during the passage of a P-wave and a S-wave individually? Mark: 0.3 The P waves rock particles move in the same direction as the wave propagation. The S wave rock particles move up and down and perpendicular to the wave front. Question 3) How many seismograph stations are needed to locate the epicenter of an earthquake? Explain. Mark: 0.3 A minimum of three seismograph stations are needed. Using one station we can only determine the radius of the area in which the epicenter might be, but using three we can triangulate the exact location of the epicenter. Question 4) Body waves consist of the: ----------- and ------------. Mark: 0.3 Explain the two differences between the body waves. Primary waves : Are faster than secondary, can travel through solid liquid or gas and makes particles travel parallel to the motion of the wave. Secondary waves : Are slower, can only travel through solid, and particles move perpendicular to the wave motion. Question 5) How much more energy does a M L = 8 earthquake release than a M L = 6 earthquake? Mark: 0.3 E 8 = 10 (11.8 + 1.5·8) = 1000 E 6 10 (11.8 + 1.5·6)