Report of the Great Earthquake of 12th June, 1897 |
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Common terms and phrases
12th June alluvium angle appears Assam bank Barisal barograph Bengal Bihar Brahmaputra brick bridge broken building bungalow Calcutta cause centre of gravity Cherrapunji commencement compression cracks damage depth Dhubri direction displacement distance district disturbance earth earthquake wave edge effect epicentre fallen fault feet fell felt fissures formed fracture Garo Hills gate pillars Gauhati Geological Survey Goalpara greater ground height horizontal inches Indian Railway instrument Kaunia Khasi Hills land landslips less magnetic Magnetograph maximum miles minutes movement north and south noticed observed original oscillations outpourings of sand places Plate portion probably railway Rambrai Rangpur rate of travel records road rock roof running sand and water seen seismic Shillong shock side Silchar Sirajganj sounds station stone stream subsided surface Survey of India Sylhet tank Telegraph Tezpur thrown tilted tomb twisted undulations valley velocity vertical vibrations village walls wave particle
Popular passages
Page xx - Microseismic shock: recorded by a single seismograph or by seismographs of the same model, but not by several seismographs of different kinds; the shock felt by an experienced observer.
Page 117 - Everywhere the hillsides facing the valley have been stripped bare from crest to base, and the seams of coal and partings of shale could be seen running in and out of the irregularities of the cliffs with a sharpness and distinctness which recalled the pictures of the canons of Colorado. At the bottom of the valley was a piled up heap of debris and broken trees, while the old stream course had been obliterated and the stream could be seen flowing over a sandy bed, which must have been raised many...
Page 80 - ... of the range of motion, and to the fact that its direction was oblique and not directly upwards, thus allowing the muscles and joints to yield and so diminish the violence of the shock. Fishes were differently situated ; attacked on all sides and over the whole surface of their body by a blow of greater violence than this, they were killed in myriads, as by the explosion of a dynamite cartridge. In the Garo Hills, even where the rivers had been unaffected, by landslips, the fine fishing pools...
Page 5 - The feeling was as if the ground was being violently jerked backwards and forwards very rapidly, every third or fourth jerk being of greater scope than the intermediate Ones. " The surface of the ground vibrated visibly in every direction, as if it was made of soft jelly ; and long cracks appeared at once along the road.
Page 4 - ... tank of the Shillong Personal experience. waterworks, near the school. At 5-15 (according to the ordinary Shillong time, but it is not known how this compares with absolute Calcutta or Madras time) a deep rumbling sound, like near thunder, commenced, apparently coming from the south or south-west, followed immediately by the shock. The rumbling preceded the shock by about two seconds where I stood, and the shock reached its maximum violence almost at once, in the course of the first two or three...
Page 43 - ... the earthquake was only noticed by a small proportion of people who happened to be sensitive, and being seated or lying down were favourably situated for observing it. This scale does not pretend to scientific accuracy, nor are the differences between the successive isoseists by...
Page 183 - ... the seismic waves also) and the amplitude of the vibrations falling within the limit of photographic action, the record runs beautifully clear after this, and every wave is registered following its predecessor with more or less rhythmic precision the intensity of the disturbance getting less and less till, at about 34 minutes past the hour, the disturbed trace runs into normal curve once more.
Page 213 - The relative amount of the two compounded motions being dependent upon the velocity and time of movement of the base, and upon the perpendicular distance measured horizontally at the surface of adherence between the centre of adherence and the centre of gravity of the body. This latter case is that which appears to have twisted the stones of Calabria, South America and Greece, and affords, as I feel assured, the true explanation of the phenomenon.
Page 182 - ... declination and upwards, are not recorded ; the velocity of the speck of light, together with the motion of the paper, a little over half an inch in one hour, precludes photographic action unless the amplitudes are brought within the above limit, and naturally the first impressions produced are at the extreme ends of the amplitude, where the velocity is a minimum. It is only when the vibrations fall to within...
Page 266 - Road over a small stream, which here joins the Brahmaputra. The original length of the bridge, as measured along the hand rail, was 99 feet, 4 inches, while the present length, between the same points, is 97 feet, 10 inches. The bridge has therefore been shortened 18 inches. This has been caused by fissuring of the banks on both sides of the stream, the abutments having been carried forward. One of the piers has been tilted over probably by the thrust of the girder. There are no cracks in the abutments.