11. You hear an astronomer on the evening news, pointing out a coming alignment of planets andpredicting that the extra gravitational attraction is sure to trigger a huge earthquake in Californiaduring the few hours of alignment. Based on what you learned in class, a reasonable approach isto: A. Stay the heck out of California, because if you go, you will be trampled to death by all the
scientists running to California to observe the quake. B. Take it seriously; maybe the quake isn’tcertain, but a big quake is more likely than not during those few hours. C. Ignore it; althoughgravitational forces such as tides and planetary pulls might possibly exert a very small effect onearthquakes, no one has successfully predicted the where-and-when of earthquakes. D. Go toCalifornia with your camera to take pictures of the buildings falling down during the alignment soyou can sell the pictures for lots of money.By keeping track of where earthquakes happen, combing written and oral histories of pastearthquakes, looking at geological deposits to see where shaking has occurred and broken rocks ortree roots or caused sand boils, and measuring where rocks are moving and where they aren’t,good estimates can be made of earthquake hazards; but, we can’t figure out exactly when the nextquake will hit. Planetary-alignment predictions have been made, and have failed miserably. Thetiny effect of gravity of the planets on the Earth has not been shown to affect earthquakes at all,although it remains possible that some very small influence exists.Your Response: C Points Earned: 1/1 12.The picture at right shows a view in the Earthquake Lake region just northwest of Yellowstone.The ramp or slope (often called a scarp) formed in an earthquake. What likely happened? Points Earned: 0/1 13.The picture at left shows a section of fence straddling the San Andreas Fault. The photograph wastaken a few days after the great 1906 San Francisco earthquake. The reason the fence isdiscontinuous is: Points Earned: 1/1
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- Fall '08
- Earthquakes, rocks, Death Valley