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A series of mysterious ground movements accompanied the slight storm of Saturday night and the heavier one of Sunday night, it was learned yesterday at the University seismographic station.
These movements, called microseisms, or small tremblings, constitute one of the most puzzling types of ground movements which are now being investigated by seismologists.
No single explanation has yet been found for these movements, but they have been attributed to various causes, such as the dashing of the waves on the coast, rippling movements in the ground caused by strong winds, temperature changes, barometric changes, and like phenomena.
An interesting accompaniment to these tremors was a marked southward tilting of the ground early Saturday evening, while, from about 9 o'clock on, a distinct swing back toward the north took place.
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