Abstract
AMONG the most interesting and important of the new ideas, which have been introduced into seismology, in late years, must be classed Major E. G. Harboe's notion of the nature of earthquake origins. Originally treated as a point, the focus of an earthquake has long been recognised an area, but we are still in the habit of regarding it as restricted in size and small in comparison with the dimensions of the area over which the earthquake is felt. On this hypothesis the decrease in violence is correlated with increase in distance, and due to a gradual diminution intensity as the disturbance travels from its origin according to Major Harloe's conception, the focus of an earthquake is no longer restricted in size, but ramifies, with a varying degree of initial violence, over nearly the whole of the seismic area.
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OLDHAM, R. Earthquake Origins . Nature 73, 620–621 (1906). https://doi.org/10.1038/073620b0
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DOI: https://doi.org/10.1038/073620b0