Glg 110 Earthquakes

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Great earthquakes are known to occur on both the west coast and mid-continent of North America, but their causes and effects differ greatly. Below is a USGS map comparing the areas affected by the 1994 Northridge, California and the 1895 Charleston, Missouri earthquakes. (Red areas are those sustaining extensive damage to buildings and other structural elements; yellow areas were shaken, but sustained minimal damage.) As you can see, the earthquakes were nearly equal in magnitude. Compare and contrast the 1906 San Francisco Earthquake with the 1811 New Madrid Earthquake. Include these elements: type of faulting and offset, epicenter, magnitude, damage, duration, date, and area affected. California’s earthquake on April 18, 1906 which lasted around 45-60 seconds, is thought to be one of the most momentous earthquakes in history. The degree in which earthquakes are monitored and studied is due to the sheer size of its horizontal displacement and rupture length. As a result of this earthquake theories such as, elastic-rebound has been one of the models used to portray the earthquake cycle. Although, there is no actual set answer for the magnitude of the San Francisco Earthquake some say it was 7.7 however, it was re-evaluated and was said to be 7.9. At the surface of California's plains the offset was about 20 feet and was monitored near Point Reyes. However, a study done has found that the measurements were approximately 24 feet near Point Reyes and 28 feet close to Shelter Cove (north of the rupture). The main area hit was San Francisco yet, it did affect almost all of the San Andrea’s Fault. Damage and casualties after the San Francisco earthquake were devastating, 498 deaths in San Francisco, 64 deaths in Santa Rosa and 102 deaths near San Jose. 225,000 from a population of around 400,000 were homeless. 28,188 wood and brick buildings were also destroyed by the

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