Geology 161 Q-A Chapters 4 � 5

Geology 161 Q-A Chapters 4 � 5 - Danny West Geology...

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Danny West April 12, 2008 Geology 161 Chapters 4 – 5 Chapter 4 1. A swing-door in a wall aligned N-S would swing in response to which components of ground motions? E-W 2. A ray, traveling in a rock with seismic velocity 3 km/sec, encounters an interface with a rock of 4 km/sec at an angle of 45 degrees. At what angle from the normal does it leave the interface? 63 degrees 3. A ray approaches the interface of the previous question at an angle of only 10 degrees to the interface. It leaves the interface at an angle of: 10 degrees 4. If a P-ray arrives at the core-mantle boundary at an angle of 25 degrees, at what angle does it enter the core? 14 degrees 5. A ray crosses from a rock with velocity 2 km/sec into one of 4 km/sec such that it runs along (parallel to) the interface after refraction. At what angle did it approach the interface? 30 degrees 6. What is the quickest time it takes a seismic energy to travel the following epicentral angles? a. 50 9 b. 90 13 c. 98 14 d. 142 19.5 e. 180 20 f. 183 20 7. What are the least and greatest epicentral angles at which a P’ ray can arrive from its source?
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