Publications of the Earthquake Investigation Committee in Foreign Languages Volume 1-5

Publications of the Earthquake Investigation Committee in Foreign Languages Volume 1-5

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ... The recording plate revolved once in 118 seconds, and the short radial lines mark successive seconds of time counted from the start. Ve can thus determine the magnitude and direction of motion at any instant during the earthquake, as vell as the duration, the intensity, and other elements of the shock. Below we give results deduced from the diagram. Time qf Occurrence. 1894, June 20th; 2" 4" 10' p.111. Horizontal Motion. The earthquake began as usual with tremors. The duration of tremors, as indicated by ordinary seismographs, lasted about 10 seconds. The Large Motion Seismograph does not record minute tremors, and the motion was already a few millimetres in range at the beginning of this diagmm. However, we shall take this latter point as the beginning of the earthquake. The motion, already strong in the 1st and 2nd seconds, became suddenly violent and the ground moved 37 mm. during the time interval between the 3rd and-lth seconds. This was followed by a counter-movement of 73 mm., which was the maximum horizontal motion during the earthquake, and was again followed by a motion of 12 mm. The motion during about 1 minute succeeding the above three most prominent shocks was very much weaker, though still great in range. Some large undulations occurred between the 40th and 53rd seconds and again between the 70th and 78th seconds. But the intensity of motion was not so strong as before. The comparatively little damage occasioned by the present earthquake notwithstanding such great horizontal movements is no doubt due to the small number of violent oscillations. Period of Horizontal Motion. The above maximum horizontal motion was executed in 0'9 second, so that the complete period of oscillation would be 1'8 second. l) more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236556801
  • 9781236556806