earthquakes lab
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Durham Technical Community College *
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Course
230
Subject
Geology
Date
Dec 6, 2023
Type
Pages
3
Uploaded by AmbassadorComputerHorse22
2. Decide whether some of the faults examined by different groups represent the same earthquake. If they do, group these events together by shading, highlighting, or circling them on your table. Come up with a revised list of the estimated ages of major earthquakes on the San Andreas at Pallett Creek, calculate the interval of time between earth event, and enter this information in the Pallett Creek Earthquake History Table.
3. Discuss the pattern of occurrence of large earthquakes at Pallett Creek. How frequently do they occur? This frequency is usually expressed as recurrence interval, i.e., the interval of time between faulting events. Using the combined data from all trenches, answer the following questions:
-How many large earthquakes are documented in the sedimentary record at Pallett Creek?
There have been two large recorded earthquakes at Pallet Creek. One in 1857 and the second in 1906.
-What is the shortest time interval between events? What is the longest?
The shortest time period is between the two earthquakes, which is 49 years. The longest time period is between the second earthquake and today 2023, which is 117 years.
-What is the average recurrence interval for large earthquakes in this area? 135
4. Assuming that the data from Pallett Creek are representative of the present slip rate along the San Andreas, and that they can be extrapolated to predict future activity along this part of the fault, interpret your data to answer the following questions.
-If the next large event were to occur at the average recurrence interval, when would it occur, given that the last large event here was in 1857? 1992
-What does the geologic record here predict will be the time range in which the next big event will occur?
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