Question

On 28 October 1983, the Lost River Fault broke free for a magnitude 7.3 MS event, moving Borah Peak, Idaho's highest point, 4 m lower.

A) Upward
B) To the north
C) Down to the east
D) Down to the west

Answer 1

Borah Peak in Idaho moved due to a magnitude 7.3 earthquake along the Lost River Fault. Given the geological context of the western United States, the correct answer is (C) Down to the east.

Step-by-step explanation:

The student's question appears to pertain to the displacement of a geological feature as a result of seismic activity. Specifically, the question refers to the movement of Borah Peak in Idaho after a magnitude 7.3 earthquake occurred along the Lost River Fault on October 28, 1983. Based on the geologic processes such as those observed in other seismic events and land movements, including those at Mount St. Helens and other fault lines, the correct answer to the displacement of Borah Peak would most likely be (C) Down to the east, since the western United States is characterized by complex tectonic interactions that often result in such directional movements along fault lines.