On microseisms

Abstract

Ever since the beginning of instrumental seismology the problem of microseisms has been a subject of investigation. While most of the types of microseisms the cause is known, there is still no agreement among seismologists on the cause of the most common type, namely, the more or less regular microseisms with periods of from 4 to 10 seconds. They have been found everywhere that instruments with a magnification of more than 100 for sinusoidal waves with periods of a few seconds are used.

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