巻号一覧
18 巻 (1965)
- 4 号 p. 181-
- 3 号 p. 133-
- 2 号 p. 61-
- 1 号 p. 1-
前身誌
18 巻, 2 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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宮本 貞夫1965 年 18 巻 2 号 p. 61-67
発行日: 1965/06/25
公開日: 2010/03/11
ジャーナル フリーA plan of the marine-magnetometer was made public in September, 1964 at the meeting of the Society of Terrestrial Magnetism and Electricity of Japan.
The writer proposes that about twenty marine-magnetometers for the total force are necessary for the predicting of earthquake.
If the marine-magnetometer consists of three elements, constructing twenty stations may be economically impossible within five years.
But if the magnetometer is constructed of only one element, which is the total force, twenty stations may be possible, because the structure is very simple.
An optical-pumping magnetometer is most suitable for the marine-magnetometer, because this magnetometer can record such a quick change as 500c/s, and perfectly continuously.
This magnetometer is much more sensitive and much smaller and remote-recording is much more suitable than any other magnetometer. The consumption of the electric power of this magnetometer is very little and shake-proof, because this was invented for the magnetometer of the rocket in 1957 in USA.抄録全体を表示PDF形式でダウンロード (2953K) -
山川 宜男, 帆前 正敏, 小林 悦夫1965 年 18 巻 2 号 p. 68-81
発行日: 1965/06/25
公開日: 2010/03/11
ジャーナル フリーIt is fundamentally important to give a clear definition of aftershocks before any investigation on “aftershocks” is made.
In this paper, a definition of aftershocks based on the Thomson's method is proposed. Making use of this method, we can distinguish abnormal seismic activity from normal seismic activity. This method is applied to earthquake sequences off Miyazaki Pref. The number of earthquakes recorded with the Wiechert seismograph at Miyazaki Meteorological Observatory is about 0.2 per day in the normal seismic activity. If the average number of earthquakes recorded at the observatory is over 0.5-0.6 per day during one or three months, we can assume that seismic activity off Miyazaki Pref. during this period is abnormal. So, in the case of aftershock testing, we can assume that aftershocks are occurring. This method also can be applied to the test of foreshock activity or other kind of abnormal activity, such as so-called earthquake swarm.抄録全体を表示PDF形式でダウンロード (1395K) -
田治米 鏡二1965 年 18 巻 2 号 p. 82-93
発行日: 1965/06/25
公開日: 2010/03/11
ジャーナル フリーIf the group velocity is zero, Mξ (ω, ξ) should be zero where M(ω, ξ)=0 means characteristic equation of LOVE waves. There is no real root satisfying M=0 and Mξ=0 at the same time. Complex roots must be sought.
At first, variables in the two equations have been replaced from ω and to P and Q where ω and ξ were complex but P and Q are real numbers.
At the second stage, P and Q have been found which satisfy M=Mξ=0. They have various values, corresponding to the order of the waves.
At the third stage, P and Q which were already obtained have been converted into real and imaginary parts of the frequency ω.
At last, the locus of the frequency has been found on ω-plane, calculating ω for various values of the rigidity ratio.抄録全体を表示PDF形式でダウンロード (766K) -
種々の地球模型に対する表面波分散曲線斎藤 正徳, 竹内 均, 小林 直太1965 年 18 巻 2 号 p. 94-102
発行日: 1965/06/25
公開日: 2010/03/11
ジャーナル フリーDispersion curves of Rayleigh and Love waves with periods ranging from 20 to 70 seconds are calculated for various spherical earth models with superficial sea water. The model 6E and the model 8099 are adopted as standard continental and oceanic structures and the crustal thickness is parametrically changed corresponding to the depth to the sea floor.抄録全体を表示PDF形式でダウンロード (850K) -
三木 晴男, 渡辺 晃, 島田 充彦1965 年 18 巻 2 号 p. 103-112
発行日: 1965/06/25
公開日: 2010/03/11
ジャーナル フリーOn August 1963, the observations of ultra microearthquakes were carried out by the Research Group for Ultra Microearthquakes. One of the main purposes of these observations was to elucidate the seismic activity of microearthquakes occurring in Chubu and Kinki Districts, especially in the vicinity of Neo Valley Fault in Central Honshu, Japan. Most of these observations were made by use of velocity seismographs with high magnification (about 106-107mm/kine at short period less than 1sec.) in order to register very small earthquakes of seismic magnitudes less than zero and to get a good noise-to-signal ratio at the short period.
During the observation period, about 1, 500 earthquakes were observed by our Group at temporary stations, 9 in total, and also at 4 routine stations of Kyoto and Gifu Universities, spread widely over Kinki and Chubu Districts up to distance of about 170km. As the result of the observations, we could find that about 50 earthquakes, including microearthquakes of M less than 2 or 3, were occurring every day in this region. This fact showss that the seismicity of a given region of high activity can be estimated from high-gain recordings during a very short time interval.抄録全体を表示PDF形式でダウンロード (3539K) -
萩原 尊礼, 岩田 孝行1965 年 18 巻 2 号 p. 113-122
発行日: 1965/06/25
公開日: 2010/03/11
ジャーナル フリーWe examined how many earthquakes reported in PDE of USCGS were detected at Tsukuba Seismological Station during the period from January 1963 to April 1964. The detection capability in connection with the magnitude, the epicentral distance and the focal depth was investigated.抄録全体を表示PDF形式でダウンロード (921K) -
三好 寿1965 年 18 巻 2 号 p. 123-124
発行日: 1965/06/25
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (249K)
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