Questions for Earthquakes Part 1

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Chaffey College *

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101

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Geography

Date

Dec 6, 2023

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pdf

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5

Uploaded by DeaconSwanMaster597

Earthquakes Part I PowerPoint Q&A Directions: Write your answers on the line below the question and be sure to highlight, change colors, or underline the answer to make it easier to read. 1. Why can rocks bend? If rocks are put under pressure, they will deform 2. When you pull hard on a rubber band and it snaps, what do scientists call that action? Elastic limit 3. What is a simple definition of stress? a force applied over an area 4. What is causing stress on the San Andreas fault? The strain and stress on the land 5. On the map on slide #3, in which direction is the Pacific plate moving? Choose one: N, NE, E, SE, S, SW, W or NW NorthWest 6. On the same map, what is the closest ocean fracture zone to Los Angeles? Murray fracture zone 7. What is the simple definition of strain? the change is the size and shape (deformation) of the land 8. What is wrong with the railing in the photo of slide #3?
There’s a slight bend in the railing 9. Looking at the diagram in slide #4, summarize in simple language how the elastic rebound theory works. (It’s a pretty simple theory!) It bends and then snaps 10. What limit is reached at the moment a magnitude 8 earthquake occurs on the San Andreas? the continuous stress of the 2 plates trying to slide by causes the plates to bend for about 120 years until the rocks snap 11. What is the word used to describe the offset after an earthquake when the bending and stored energy have been released? Elastic rebound 12. Roughly how often do earthquakes on the southern San Andreas occur? 164 years ago 13. The last time that SoCal had an earthquake on the San Andreas was 1857. Since then the Pacific plate has moved about 27 feet to the northwest. What simple thing are the rocks doing so that no earthquake has occurred? It hasn’t been strained 14. Is the San Andreas primarily a strike-slip or a dip-slip fault? Strike-slip 15. The Cucamonga fault is lifting up the San Gabriel mountains behind Chaffey. Is it a strike-slip or a dip-slip fault?
Strike-slip 16. In slide #6, is the fault shown right or left lateral? Check slide #7 if you are unsure. Both 17. Going back to slide #5, in the strike-slip picture, is the fault right or left lateral? Right lateral 18. Looking at slide #8, which fault shown is left lateral? A or B B 19. In a normal fault, does the hanging wall move up or down? Down 20. What is an alternative name for a reverse fault? Thrust fault 21. What type of fault is the Cucamonga fault? Reverse fault 22. The San Jacinto mountains are caught in a vise between the Pacific plate colliding with the North American plate at a bend on the San Andreas. Are the San Jacinto mountains rising on normal or reverse faults? Normal faults 23. The Sierra Nevada mountains are rising because they are experiencing a stretching force that extends all the way to the mountains above Salt Lake City. Are the faults causing the Sierras to rise normal or reverse faults?
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