150Lec25-1 - Lecture#25 US East Coast Earthquakes(Abbott pp...

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Lecture #25: US East Coast Earthquakes (Abbott, pp. 177-181) As shown in Figure 7.1 (p. 162), South Carolina and several US east coast states are susceptible to dangerous earthquakes. Between 1698 and 1886, 13 earthquakes were known to have shaken parts of South Carolina. Most of them were minor. However, on August 31, 1886 a moment magnitude 7.3 earthquake struck in South Carolina (Figure 7.25, p. 180; Figure 7.26, p. 181). The epicenter was located about 20 kilometers northwest of Charleston and the focus was in the deep subsurface. The earthquake killed 60 people and damaged or destroyed about 90% of the buildings in the city (p. 180). Chimneys fell as far away as Lancaster, Ohio and plaster shook from the walls of at least one building 1,200 kilometers away in Chicago. Because of the Great Fire of 1838, building codes in Charleston forbid the construction of wooden buildings. Therefore, many buildings in Charleston were completely made of bricks, which are resistant to fire, but not severe earthquakes.
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