HCEarthquake
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California State University, Sacramento *
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103
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History
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Feb 20, 2024
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docx
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Fill in the percentage of dwellings that will be rendered uninhabitable in each of the residential neighborhoods.
Downtown: 70
Hickory Estates: 8
Ralston: 8
Riverside: 90
Walnut Heights: 1
Using the information from Part A (percentage of homes rendered uninhabitable), estimate the number of people who will need emergency housing for each of the residential neighborhoods.
Downtown: 1362
Hickory Estates: 513
Ralston: 51
Riverside: 394
Walnut Heights: 25
Sixty-five miles southwest of Hazard City is the small town of Rockridge, which reported an MMI of V for the same earthquake that affected Hazard City. Which of the following best explains how there can be such a large difference in the damage reported over such a small distance?
The MMI reports damage and damage decreases the further you get from the epicenter of the earthquake.
Why is it so difficult to consistently determine the difference between the nature of a IV or V on the MMI?
Lower intensities on the MMI are more difficult to assess because they rely more heavily on human perceptions rather than damage.
Building material type determines what percentage of structures is habitable after a large earthquake. Why might 1-3 story, single-family, wood-framed structures built after 1940 survive better than multifamily, wood-framed houses built during the same time period?
Multifamily housing typically has more open parking at the base of the building and, therefore, is more susceptible to lateral forces experienced during earthquakes.
Age of buildings is related to their ability to withstand seismic activity. Based on this information alone, which community should suffer the most damage during an MMI X earthquake?
Ralston
You are buying a house in a new subdivision to the east of downtown. The contractor will build whatever house you want and you have decided that you want a two-story home that will withstand earthquakes. What should your home be made of?
wood
A large earthquake occurred to the northeast of Hazard City in a remote area. Why could it be difficult to determine an MMI where the earthquake originated?
The Mercalli values are dependent on destruction of property and infrastructure, so if there are no inhabitants, the value can be difficult to determine.
At relatively lower Mercalli values, there is more damage to Downtown than to Riverside (MMI VII and VIII), but at higher values there is less damage to Downtown than in Riverside (MMI IX and X). How do you account for these differences?
The building response will depend on how intense the earthquake is. As earthquake intensity increases, building responses change.
Why were the buildings reclassified after 1940?
All of these are correct.
Does the elevation of a structure within Hazard City affect building survival?
No, it does not matter whether the house is located at higher or lower elevations.
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