Discussion
A microseism is
Answer: B
Correct answer: continuous low-level ground vibration from natural sources
Microseisms are the continuous background hum of the earth, generated chiefly by ocean waves interacting with the sea floor and coastline, with a strong peak near periods of six to eight seconds. They set the noise floor of a seismic station and rise in stormy weather. They have nothing to do with small earthquakes, which are called microearthquakes - a different word for a different thing.
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