Recent Seismological Investigations in Japan (Classic Reprint)

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Excerpt from Recent Seismological Investigations in Japan(A) Seismographs and seismometers.32. Instruments in the Seismological Institute. Instruments for recording the horizontal motion 33. Steady point and neutral equilibrium. 34. Duplex pendulum seismometer. 35. Ewing's bracket pendulum seismograph. 36. Recorder, starter. 87. Time marker. 38. Gray's conical pendulum. 39. Omori's horizontal pendulum seismograph. 40. Duplex pendulum form of the same. 41. Tanakadate's parallel motion seismograph for strong earthquakes. 42. Photographic record horizontal pendulum seismographs. Instruments for recording the vertical motion. 43. Gray's helical spring seismograph. 44. Ewing's vertical motion seismograph. 45. Ordinary Ewing-Gray-Milne seismograph. 46. Tanakadate's spiral spring seismograph. 47. Resume. 48. Sensible or Macro-seismic, and Insensible or Micro-seismic Motions.(B) Sensible or Macro-seismic motion.49. Three sections of ordinary earthquake motion. Ripples. Intensity. 50. Relative and absolute scales of intensity. 51. Maximum movements in different earthquakes. Direction of motion. 52. Prevailing directions in different localities. Duration. 58. Total duration dependent on magnitude and distance. 54. Duration of preliminary tremors varies with the distance only. 55. Duration of the main part in destructive and strong earthquakes. Period of vibrations at Miyako. 56. Period of Maximum horizontal and vertical motion, and of ripples. Earthquake measurements at Hitotsubashi and Hongô. 57. Average values of earthquake elements at Hitotsubashi. 58. The same at Hongô. Comparison of earthquake movements on different soils, etc. 59. Comparison of Hitotsubashi and Hongô. 60. Loose soft soil and hard compact ground. 61. Semi-gravity waves. 62. Comparison of the earthquake motion above and below ground level. 68. Marginal vibrations. Earthquake Sounds. 64. Earthquake sounds and their cause. Seismic Triangulation. 65. The velocity of propagation of the ordinary earthquake waves determined by triangulation. The severe Tokyô earthquake of June 20th, 1894. 66. The first diagram of a destructive earthquake.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.