T KY Teikoku Daigaku Rika Daigaku Kiy Volume 11

T KY Teikoku Daigaku Rika Daigaku Kiy Volume 11

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ...from the station can be explained by assuming two sets of waves, which, originating simultaneously at the centre of disturbance, are propagated with different velocities. If Vi denote the velocity of propagation of the small preliminary tremors, and if V2 denote that of the principal waves of an earthquake, we find For the cases of the Mino-Owari Earthquake (No. 1, 6) and the Hokkaido Earthquake (No. 2, 6), we obtain: --It is, however, to be observed that equation (1) has been deduced from the observation of earthquakes, the distances of whose origins from the observing stations do not exceed 900 kilometres, and it would evidently be absurd to apply the same equation to cases of very distant earthquakes, for instance, those originating in Japan and observed in Europe. Such earthquakes give the high values for the transit velocity of 12 to 14 kilometres per second. 16. What was said in the preceding paragraphs seems to show the coexistence in earthquakes of two principal kinds of waves whose velocities of propagation are different. It must not, however, be supposed that the motion of an earthquake consists of only two kinds of waves. On the contrary, an earthquake motion consists, when the origin is not very far distant from the observing station, of several kinds of waves with different periods of vibration, ranging generally between a fraction of a second and several seconds. Short-period vibrations, which always occur most markedly at the beginning of the motion, gradually die away, leaving behind only the vibrations of long periods. Perhaps it may be that waves with different periods are propagated with different velocities. Fig. 5 is a reproduction of the EW component diagram of the moderately strong earthquake of the 3rd...
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Product details

  • Paperback | 92 pages
  • 189 x 246 x 5mm | 181g
  • United States
  • English
  • black & white illustrations
  • 1236893794
  • 9781236893796