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Name _____________________________ Date __________ Period __________ Science 81 Geology 101 B5b DESIGNING AN EXPERIMENT EARTHQUAKE DEPTHS In Chapter 7 you learned that the Earth’s lithosphere is broken into several plates. The plate movements cause rocks to break and earthquakes to occur. The point where rocks break inside the Earth is called the focus of the earthquake. Do all earthquakes occur at the same depth in the earth’s crust or is there a relationship between earthquake depth and the subduction process? 1. With graph paper make a scatter plot to show the depth of earthquake foci and the distance from the coast of each epicenter. 2. Place Distance from the coast on the horizontal axis. Begin labeling at the far left with 100 km west and each space is 50 km. To the right is 50 km West and then 0 m, and then increase by 50 km up to 700 km East. 3. Label the vertical axis Depth below Earth’s surface. Begin labeling at the bottom of the vertical axis with –700 km. Let each space equal 50 km until you reach 0 which represents the earth’s surface. 4. Plot the focus depth for each earthquake on the graph. You do not need to label them. QUAKE FOCUS DEPTH DISTANCE OF EPICENTER FROM THE COAST (KM) A B C D E F G H I J K L M N O P Q R S T U -55 km -295 km -390 km -60 km -130 km -195 km -695 km -20 km -505 km -520 km -385 km -45 km -305 km -480 km -655 km -85 km -525 km -85 km -445 km -635 km -55 km 0 100 east 455 east 75 east 255 east 65 east 400 east 40 west 695 east 390 east 335 east 95 east 495 east 285 east 545 east 90 west 205 east 25 west 595 east 665 east 95 west © J.G.Mullett 2015-2016 Page 1 ANALYZE AND CONCLUDE: ANSWER IN COMPLETE SENTENCES. 1. What is the relationship between the distance from the coast of an earthquake and the depth of earthquake foci (where they begin)? _______________________________________________________________________________________ _______________________________________________________________________________________ _________________________________ 2. Based on the graph you have constructed, hypothesize what type of plate boundary is shown and why you came to that conclusion? _______________________________________________________________________________________ _______________________________________________________________________________________ _________________________________ 3. What point on your graph, represents the coast? ____________________________ 4. Is the continent located east or west of the plate boundary? Explain how you know. _______________________________________________________________________________________ _______________________________________________________________________________________ _________________________________ 5. Hypothesize why earthquakes do not occur below 700km. _______________________________________________________________________________________ _______________________________________________________________________________________ _________________________________ © J.G.Mullett 2015-2016 Page 2