Assignment 5 - Assignment 5 Chapter 4 1 A How long did...

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Assignment 5 Chapter 4 1. A) How long did ground motion last during the Alaska 1964 earthquake ? The ground motion lasted for 7 minutes. B) What caused the death of most of the 131 lost during that earthquake? A tsunami killed the most people, 122, during the earthquake. 2. A) In the Mexico City 1985 earthquake, how far was the city from the actual epicenter? The city was 220 miles away from the epicenter. B) Why did so many buildings collapse in Mexico City? So many buildings collapsed in Mexico City because of resonance in the buildings. C) List the 4 design flaws in the buildings that failed. The four design flaws in the building that failed were that they had soft first stories, poorly joined building wings, they were odd-shaped buildings prone to twist on their foundations, and they were built close to other buildings of different heights and vibration frequencies that bumped into each other during the earthquake. 3. What are the two lines of evidence for a large earthquake in the Pacific Northwest in about 1700? The two lines of evidence from the earthquake in 1700 were the tsunami records from Japan and the tree rings of the dead, drowned trees.
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4. What caused most of the damage in the 1906 earthquake that destroyed San Francisco? Fire caused the most damage in the 1906 earthquake that destroyed San Francisco. 5. A) Discuss at least 3 reasons why building collapse was extensive in the Marina District. Three reasons why buildings collapsed in the Marina District were the amplified shaking that occurred, the liquefaction of artificial-fill foundations, and design flaws in the buildings.
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