The book Modern Seismology was written by author George Walker Here you can read free online of Modern Seismology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Modern Seismology a good or bad book?
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Seismographs are sensitive instruments and thus liable to be disturbed by artificial causes such as street traffic, so that the instruments ought to be installed at some distance from a town or railway line. But such local effects do not penetrate to a great distance, so that it is only a question of being a kilometre or so distant from such a source of disturbance. We remember that most of the European stations from which such important results have been obtained are at no great distance from ...busy centres of industry. The dominant features of a seismogram of a large tectonic earthquake are not determined by local con- ditions of the ground, but the smaller details of the seismograms may be modified greatly by the geological formation of the rocks in the vicinity of the station. Thus a site where the formation is known to be of fairly uniform character for a con- siderable area would be preferable to one where the rocks vary rapidly. A level plain also recommends itself, while a sharp ridge or sudden depression are to be avoided.
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