cover image: Memoirs of the Geological Survey of India  Report on the Great Earthquake of 12th June 1897

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Memoirs of the Geological Survey of India Report on the Great Earthquake of 12th June 1897

1899

2. The shape of the orbit in which the particles of water travel changes gradually as the wave progresses, as may be seen in the gradually changing form of the waves as-they travel outwards, but the change is slow and, for any given spot, the tracks in which all the particles of water move may be iegarded as similar, and the nature of the wave motion can be defined by the shape of the track follow [...] The movement is in fact just like that of the bob of a pendulum, assuming the direction of travel of the wave to be that of the swing of the pendulum. [...] Returning to the diagram fig ii, the distance from o to 4 is the amplitude of the wave, or the extreme distance which the wave-particle reaches from its normal position ; 4 to 12 is the double amplitude or range of motion of the particle, and the time taken by the wave-particle in travelling from o out to 4 And back through 12 to o is the period of the wave. [...] Whatever may be the nature of the laws which govern the movement of the wave-particle in these surface undulations it is hardly possible that they can be the same in the case of waves which differ so much in size and rate of move- ment as the two forms of surface wave referred to in the preceding paragraph This conclusion appears to be supported by the absence of any passage from the one to the ot [...] In the case of earthquake waves in the region where the shock is severe enough to be felt, nothing of the sort has been recognised and nothing of the sort is to be expected, seeing how heterogeneous are the materials of which the outer crust of the earth is composed.

technology medicine science
Pages
481
Published in
India
SARF Document ID
sarf.100011
Segment Pages Author Actions
Frontmatter
i-vi R.D. Oldham view
Preface
i-xxx R.D. Oldham view
Chapter I.—Introductory
i-4 R.D. Oldham view
Chapter II.—Narrative Accounts of the Nature of the Shock
4-41 R.D. Oldham view
Chapter III.—The Isoseismic Lines and Area Over which the Shock was Felt
42-52 R.D. Oldham view
Chapter IV.—The Rate of Propagation and Time of the Commencement of the Shock
53-77 R.D. Oldham view
Chapter V.—The Rate and Range of Motion of the Wave Particle
78-85 R.D. Oldham view
Chapter VI.—Earth Fissures Sand Vents and Allied Phenomena
85-111 R.D. Oldham view
Chapter VII.—The Landslips
111-123 R.D. Oldham view
Chapter VIII.—The Aftershocks
124-128 R.D. Oldham view
Chapter IX.—Results of an Exploration of the Epicentral Tract
129-163 R.D. Oldham view
Chapter X.—The Position and Extent of the Seismic Focus
164-179 R.D. Oldham view
Chapter XI.—The Records of the Bombay Magnetic Observatory
180-189 R.D. Oldham view
Chapter XII.—Electric Effects
189-191 R.D. Oldham view
Chapter XIII.—The Earthquake Sounds with Some Remarks on the Barisal Guns
191-207 R.D. Oldham view
Chapter XIV.—The Rotation of Pillars and Monuments
207-226 R.D. Oldham view
Chapter XV.—The Unfelt Earthquake
227-256 R.D. Oldham view
Appendices
257-379 R.D. Oldham view
Index to Place Names of Indian Localities
i-xviii R.D. Oldham view
Backmatter
i-xli R.D. Oldham view

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