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Name_________________ “Where Do Earthquakes Happen” and “Finding an Epicenter” Lab Quiz Where Do Earthquakes Happen 1. Where do most earthquakes occur? Why? _______________________________________________________________________. 2. If you wanted to live in a part of the world with the least probability of earthquake activity, where would you live? ______________________________________________________________________. 3. Does the data on your map support your answer to #2? Why or Why not? ________________________________________________________________________ ________________________________________________________________________ _______________________________________________________________________. 4. Name a specific area in which the probability of an earthquake is the highest. _______________________________________________________________________. 5. Name the major plate that encompasses the area that describes your answer to #3. _______________________________________________________________________. Finding an Epicenter 6. If the average speed of a P wave is 7 km/s and the average speed of an S wave is 5 km/s calculate the lag time between the arrive of P waves and S waves over a distance of 100 km. SHOW YOUR WORK!!! NO WORK, NO CREDIT!!! 7. City Lag Time Austin Bismark Portland 130 seconds 150 seconds 100 seconds Distance from city to Epicenter Use the lag times provided and lag time found in #6 to calculate the distance from each city to the epicenter of the earth quake using the equation provided in your lab (#4). SHOW WORK!!! 8. Why must measurements from three locations be used to find the epicenter of an earthquake? ________________________________________________________________________ _______________________________________________________________________.