Letter | Published:

A New Departure in Seismology

Naturevolume 81page38 (1909) | Download Citation



ON the photographic records obtained from British Association types of seismograph it has been noticed that when the films have been moving slowly (60 mm. per hour) there have been slight thickenings in the trace, while if the recording surface has been moving quickly (240 mm. per hour) the line which ought to be straight is slightly wavy. These irregularities, which have hitherto received but slight attention, are so small that they may be easily overlooked. When the thickenings were first observed it was supposed that their existence was due to a flickering at the source of light or to some irregularity in the movement of the record-receiving surface. When, however, it was observed that these markings frequently occurred at the same time at different stations, as, for example, at Shide and Bidston, the conclusion was that they were due to movements of the ground, and might be the surviving phases of large movements with origins at a distance.

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  1. Shide, Isle of Wight



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