巻号一覧
9 巻 (1956 - 1957)
- 4 号 p. 189-
- 3 号 p. 125-
- 2 号 p. 65-
- 1 号 p. 1-
前身誌
9 巻, 4 号
選択された号の論文の7件中1～7を表示しています
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竹内 均1957 年 9 巻 4 号 p. 189-199
発行日: 1957/03/25
公開日: 2010/03/11
ジャーナル フリーGeneral solutions are obtained in rectangular, circular cylindrical and spherical coordinates of the equations of motion of homogeneous, isotropic elastic body (in section 2), the equations of statical deformations of homogeneous, isotropic elastic body (in section 3), the equations of motion of incompressible, viscous fluid (in section 4), the equations of stationary motion of incompressible, viscous fluid (in section 5), and the Maxwell's equations for homogeneous, isotropic conductor (in section 6).抄録全体を表示PDF形式でダウンロード (595K) -
岸本 兆方, 神月 彰1957 年 9 巻 4 号 p. 200-208
発行日: 1957/03/25
公開日: 2010/03/11
ジャーナル フリーThe structure of the earth's crust was determined by an analyis of the refracted seismic waves forerunning the direct ones of the shallow earthquakes. On the other hand, by allowing for the study of the transformed waves in deep earthquakes, the crustal structure was determined around Kyoto as follows: namely, it is composed of three distinct layers whose thickness and propagation velocities of P-and S-waves are repectively, listing from the earth's surface to the deeper layer, 6km and 5.4, 3.1km/sec for the granitic layer; 14km and 5.8, 3.4km/sec for the granodioritic layer; 10km and 7.0, 4.0km/sec for the basaltic layer. As to the mantle surface underlying the basaltic layer, the velocities of P-and S-waves were estimated as 8.1km/sec and 4.7km/sec respectively.
Also in this article the regional differences in the crustal structure were discussed in some details, and moreover, the correlation between the regional differences of the crustal structure and the focal depths of shallow earthquakes in their respective area was mentioned.抄録全体を表示PDF形式でダウンロード (729K) -
岸本 兆方, 神月 彰1957 年 9 巻 4 号 p. 209-217
発行日: 1957/03/25
公開日: 2010/03/11
ジャーナル フリーThe structure of the earth's mantle, mainly its upper part, having been investigated by the analysis of seismic waves of five Kamchatka-Kurile Islands Earthquakes of shallow focus and some others, the problems on the existence and property of the 20°-discontinuity and the low-velocity layer in the mantle are discussed in some detail. The time-distance graphs obtained in Japan are in fair agreement with Jeffreys-Bullen's Table (1939), and also the 20°-discontinuity is considered to exist certainly at nearly the same depth as given by Jeffreys. The amplitude relation observed at the epicentral distance near 20° between the direct wave propagating through the medium entirely above the 20°-discontinuity and the refracted wave penetrating down into that discontinuity is just the reverse of that commonly expected, that is, the former being small and the latter large both for the P- and S-waves. Concerning this phenomenon some arguments are given. Moreover, the existence of a new discontinuity was ascertained at some depth below the 20°-discontinuity, as deduced from the appearance of a prominent later phase. As to the existence of a low-velocity layer in the mantle, it is negatively concluded from the analysis of seismic waves observed at the station in Japan of the earthquakes of Kamchatka-Kurile Islands, but the possibility of its existence near the crust in the form of pocket or reservoir is supposed to be not unreasonable, its problem being postponed to a succeeding paper.抄録全体を表示PDF形式でダウンロード (692K) -
三雲 健, 大塚 道男, 神月 彰1957 年 9 巻 4 号 p. 218-228
発行日: 1957/03/25
公開日: 2010/03/11
ジャーナル フリーThe precise observations of local earthquakes were carried out in Wakayama District, for the purpose of studying the crustal structure and nature of local shocks.
As a result of these observations, the travel-time anomalies were detected, and the time-distance curves were separable into two groups which seemed to be related with the directions of initial motion of shocks recorded at their respective stations. The cause of the travel-time anomalies may safely be regarded as being attributed to the focal conditions and mechanism of earthquake occurrence.
With regard to the structure of the crust in the district concerned under the assumption of horizontal parallel layers, the velocities in the surface layer, second, and third layers were estimated to be 4.3, 5.4-5.6 and 6.0km/sec for the P-waves and 2.5, 3.2 and 3.4km/sec for the S-waves, and the thickness of surface layer about 4km, respectively.抄録全体を表示PDF形式でダウンロード (919K) -
坪井 忠二1957 年 9 巻 4 号 p. 229-234
発行日: 1957/03/25
公開日: 2010/03/11
ジャーナル フリーBy using the newly deduced formula:
M=1.73logΔ+logA-0.83,
where M is the magnitude of an earthquake, and A is the maximum ground amplitude measured in micron at the epicentral distance Δ measured in km., the magnitudes of 1025 earthquakes which took place from 1931 through 1955 in and near Japan have been determined.
The mean annual number N of earthquakes according to the magnitude has been found to be expressed by
logN=-1.08+0.72(8-M), for ΔM=0.1.
The mean rate of energy release by earthquakes in and near Japan has been estimated to be 1.5×103ergs/cm2 year or 0.1×10-6calories/cm2sec.
As a whole, Japanese area is contributing well over 10% to the total seismicity of the world.抄録全体を表示PDF形式でダウンロード (376K) -
―あやまりと欠陥―三木 晴男1957 年 9 巻 4 号 p. 235-236
発行日: 1957/03/25
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (206K) -
宮村 攝三1957 年 9 巻 4 号 p. 236-237
発行日: 1957/03/25
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (225K)
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