Publications of the Earthquake Investigation Committee in Foreign Languages, Issues 17-19
No. 15 includes, at end of vol.: "Publications of the Earthquake Investigation Committee in foreign languages, nos. 1-16" and "Translation of the 000000000 contents of the Shinsai yobō chōsakwai hōkoku (Reports of the Imperial Earthquake Investigation Committee) nos. 1-47", 15 p.
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amplitude axis barometric pressure cause Coll corresponding curve cycle destructive earthquakes distance distant earthquakes DISTRIBUTION OF EARTHQUAKES disturbance duration E. I. C. Publ earth earth's crust earthquake motion Earthquakes in Japan EARTHQUAKES OBSERVED elastic constant Enya frequency of after-shocks geological Gifu given grams Hitotsubashi Hongo horizontal motion Horizontal Pendulum hysteresis increase instrument investigation Japan Kyoto latitude level change lunar Lunar-daily maxima maxima and minima maximum mean minimum Mino-Owari earthquake Miyako modulus of elasticity Motion Seismograph movements Nagoya Nemuro number of earthquakes occurred Omori origin period phase preliminary tremors Prof pulsatory oscillations quakes record relation respectively rocks sandstone seismic frequency Seismic number seismic wave seismographs Seismological Seismometer Sekiya shocks shown in fig specimen strong earthquakes Synodic day temperature tidal tion Tokyo Tokyo earthquake Tokyo Imperial University tsunami Variation of Seismic velocity of propagation vertical motion vibrations weight
Page 77 - Koto: On the Cause of the Great Earthquake in Central Japan, 1891.
Page 84 - ... work was transferred to the Geodetic Commission, at the same time that it was decided to establish the Observatory of the International Geodetic Association at Mizusawa. The result of the examination of the mean monthly values of the latitude of Tokyo (Astronomical Observatory) for nearly 8i years between Aug. 1895 and Dec. 1903, with reference to earthquakes in Japan, shows that all the destructive earthquakes occurred exactly or very nearly when the latitude was at a maximum or a minimum. The...
Page 5 - In the first place to investigate whether there are any means of predicting earthquakes; and in the second place to investigate what can be done to reduce the disastrous effects of earthquake shocks to a minimum, by the choice of proper structures, materials, position, etc.
Page 63 - I shall speak presently, and communicate a sort of stress to the superincumbent surface layer of the earth' s crust in the region about the observing station : the latter being, in consequence, thrown into its own proper vibrations. In fact, the preliminary tremors seem to be nothing else than the pulsatory oscillations, caused by the waves transmitted along a deep layer of the earth's crust from the origin of...
Page 6 - As the recent seismological investigations in Japan are almost wholly the work of this Committee in conjunction with the Seismological Institute of the Tokyo University, what I am going to say will practically be an account of that work and its results. The work may for convenience be classified as follows: — 1) Statistical: consisting chiefly of collecting of records and reports of earthquakes and "tsunamis"2', descriptions of the effects of the shocks, <fec.
Page 6 - From these observations, are deduced the nature of the vibrations of earth particles, their amplitude and period, the velocity of earthquake waves, and so on. The observations of distant earthquakes also come under this head. 3) Geological: including reports of volcanic eruptions, dislocations, etc.
Page 105 - A and a was fairly satisfactory. Thus in a group of the experiments, the mean values of A and « were respectively 8610 and 8670 mm. per sec. per sec. 115. For given values of height and external dimensions, a hollow column has a greater seismic stability than the corresponding solid one; the sides or walls in the former column being sufficiently thick and rigid for it to be regarded as a single structure. In the case of columns with very thin walls, a slight irregularity in the joint may cause them...
Page 23 - Tokaido were often disturbed by great non-local shocks, of which the origins were generally situated off the eastern coast of Japan, and which were probably caused by faults formed parallel to the latter. The three north-eastern provinces of Rikuzen, Rikuchu and Nemuro were often disturbed by great earthquakes of sub-oceanic origin.
Page 62 - It will be observed that the two periods of about 4^ and 8£ sec. occur most frequently in the preliminary tremors; this being also the case with the observations made at Hongo. The different periods of vibrations in the 1st and the 2nd preliminary tremors do not depend on their duration, that is to say, on the distance of the earthquake origin from the observing station. A similar conclusion probably holds good also for the periods in other stages of the earthquake motion. 74...
Page 21 - Gifu in ordinary years, which was about 18-3. Thus the calculated earthquake numbers come out finally to be 84-3 and 75-3 respectively, or together 160. Actually there were 101 and 62 earthquakes respectively in 1898 and 1899, or 163 during the two years; these numbers agreeing with the calculated results as closely as may be expected.0 Similar calculations have been made, with equally satisfactory results, for the after-shocks of the Hokkaido earthquake of March 22, 1894, S) and those of the great...