1. What is the tectonic setting of the large 2011 Tohuku earthquake in Japan? a.

Question

1. What is the tectonic setting of the large 2011 Tohuku earthquake in Japan?

a. slip along a transform fault that cuts through Japan

b. slip along a transform fault that is just offshore to the north

c. rifting in the Sea of Japan, west of the island

d. slip along a subduction zone (megathrust)

2. Why does the United States have such varying risks of seismic activity?

a. Some areas are near plate boundaries, while others are not.

b. Some regions in the continental interior have active fault systems.

c. Volcanic activity can cause seismic risk in some areas.

d. These are all reasons the United States has varying risks of seismic activity.

Explanation / Answer

1.The answer is d=slip along the subduction zone
In March 11, 2011 earthquake, a slip between both the plates occurred on a segment of the megathrust fault i.e alon the subduction zone

2.The answer is a=some are near plate boundaries while others are not
We can see western part has a plate boundary and the risk of earthquake is more and as ew move to eastern part the probability of earthquake occurrence is very low due to absence of plate boundaries.

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