Report of the Director of the State Museum and Science Department Volume 187

Report of the Director of the State Museum and Science Department Volume 187

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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. 1916 edition. Excerpt: ...beds exposed to view were little broken up by the movement; in fact they behaved much as solid rocks might have Stockport slide. Open fissure between Soft clay in bottom extruded from below. the downthrown and upraised blocks acted in similar circumstances. The main scarp-.Was"clean-cut and the sunken block held together in a body.. '.'" I. I The cause of the disturbance was ascribed at the t'1lne'-.'-q7I l-s, e presence of a layer of water-soaked liquid clay which came itbfifcie surface in the very lowest part of the ravine and upon which the upper bed rested in a state of delicate equilibrium, ready to be precipitated by some impulse. It was thought this may have been supplied by the weakening of the structure through cracking, as it was noticed that a longitudinal crack had developed along the bank shortly before the disturbance occurred, which was during the night. With increase of pressure upon the liquid layer the latter sought escape at the lowest outlet, whereupon the whole block came down at once. The sudden exertion of pressure upon the liquid layer upraised the beds in the ravine but not to an extent that could be considered proportionate to the volume of the subsidence which was estimated at from 4000 to 5000 cubic yards. An interesting circumstance, of no significance probably with respect to-the cause of the disturbance, was the occurrence of a heavy earthquake in Mexico, the vibrations of which reached Albany at 6.10 p. m., the same date. The vicinity of Stockport bears evidences of having been the scene of numerous slides of the terraced clays. Another section of the same bank is reported to have subsided since the occurrence here described. Hudson. A disturbance of serious proportions took place August 2, ...
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Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • United States
  • English
  • black & white illustrations
  • 1236930991
  • 9781236930996