In the United States,there was great concern in the early 1980s when earthquakes were frequent,including harmonic tremor,and four magnitude 6 earthquakes caused damage near this volcanic center.
A)Long Valley caldera in California
B)Valles caldera in New Mexico
C)Yellowstone National Park,Wyoming
D)Mt.St.Helens,Washington
E)Crater Lake,Oregon

Question

Quizplus · Accepted Answer

This is the only option that mentions harmonic tremor, which is a type of seismic activity associated with volcanic activity. Additionally, the statement mentions "this volcanic center," implying that the earthquakes were occurring in the vicinity of a specific volcano. The other options either do not mention harmonic tremor or do not indicate a specific volcanic center.

In the United States,there Was Great Concern in the Early