Final answer:
The Great Alaska Earthquake resulted in three major fault lines being studied by geologists: the Denali Fault and two others parallel to it. These faults exemplify the destructive potential of seismic activities and provide insights into plate tectonics.
Step-by-step explanation:
The major faults caused by the Great Alaska Earthquake, which occurred in Alaska, can be attributed to the region's active plate tectonics and the presence of several significant fault lines. Three key faults associated with this seismic event include the Denali Fault, responsible for both earthquakes and ongoing mountain uplift, and two other parallels to this primary fault line that contribute to the region's notable seismic activity. This abnormal geological activity has left a legacy of destruction similar to other historical seismic events, such as the 1923 Yokohama earthquake and the 2004 Sumatra earthquake and tsunami, which caused enormous loss of life and altered landscapes permanently.
It is important to note that these natural disasters provided critical data that help geologists understand Earth's interior and highlight the significant impact that earthquakes and volcanic eruptions can have on human societies, especially those near plate boundaries and subduction zones. The 1964 Alaska earthquake, also known as the Good Friday earthquake, was the second largest earthquake ever recorded and caused widespread destruction, showcasing the power of tectonic forces at work.