Comparing The 1857 Fort Tejon Earthquake Essay

1101 Words Dec 3rd, 2015 null Page
about large earthquakes.
Without the knowledge of geology, many people wouldn’t believe that it’s possible to tell from the earth when, where and how large of an earthquake occurred thousands of years ago. But thanks to modern-day science and technology they have made it a reality. We comparing the 1857 Fort Tejon earthquake with today 's technology we can come to an agreement that the earthquake was a rarity. When many people believed an earthquake of that magnitude was common for the San Andreas Fault. In a geophysical research letter from April 2014, “Large earthquakes are infrequent along a single fault, and, therefore, historic.” The also go on to state, “six to seven ground-rupturing earthquakes on the Big Bend of the South San Andreas Fault restrict the pattern of possible ruptures on the 1857 stretch of the fault.” When studying the historical data of the fault they discovered that over the last 650 years at least 75 percent of the surface ruptures are smaller than that of the Fort Tejon rupture. Researchers use both paleoseismic trenching and radiocarbon dating to come up with these numbers. Paleoseismic trenching is executed by excavating a dense network of trenches anywhere from 3 to 9 meters in depth. By doing this, the strata is exposed and then radiocarbon samples are taken and tested to determine the age of the material. Upon completion of these test, it was discovered that the last time there was a rupture the size of the Fort Tejon earthquake dated back to…

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