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20 w S.Pinterval 15 Time (minutes) p wave 6000 8000 10,000 Distance (km) from Epicenter warningsystem/print.htm Figure 4. Distance-time graph The distance-time graph above shows that the S-P interval is about 10 Q3. What is the distance of the epicenter from the seismic station? Q4. What do you think is the importance of determining the epicenter of an earthquake? Determining the location of earthquake epicenters plays a vital role in laying the foundations of plate tectonics. Let us see how early geologists used the plotted positions of earthquake epicenters throughout the world in conceptualizing crustal movements. 10 All rights reserved. No part of this material may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying - without written permission from the DepEd Central Office. First Edition, 2015. Activity 2 Let's Mark the Boundaries Objectives: • Describe the distribution of active volcanoes, earthquake epicenters, and major mountain belts. Determine the scientific basis for dividing the Lithospheric plates. ...
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