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Volume 5, Issue 4
Displaying 1-10 of 10 articles from this issue
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S. SANO1952 Volume 5 Issue 4 Pages 52
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (87K) -
Setumi MIYAMURA, Hideteru MATUMOTO1952 Volume 5 Issue 4 Pages 53-54
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
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Syun'ichi SANO1952 Volume 5 Issue 4 Pages 115-121
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSVarious methods to eliminate the annual variation of monthly mean sea-levels are applied for the mareogram data observed at mareograph stations along the coast of BAY of ISE, and their advantages are discussed. It is also concluded that the annual variation in the heights of sea-levels is mainly due to the annual changes in the oceanographical or meteorological elements.View full abstractDownload PDF (682K) -
Syun'ichi SANO1952 Volume 5 Issue 4 Pages 122-131
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe fluctuations from the linear secular changes in the heights of yearly mean sea-levels at various mareograph stations along the coast of West Japan, are seen parallel with each other and the amplitudes of the fluctuations are larger in the western coast of Kyusyu. The fluctuations in the heights of yearly mean sea levels may thus be attributed to the variation in the velocity of oceanic currents or the changes in some physical properties of the sea water.View full abstractDownload PDF (320K) -
Yosibumi TOMODA, Keiiti AKI1952 Volume 5 Issue 4 Pages 132-135
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSA magnetic recording seismometer was constructed. In stead of the usual density type recording device with some or other sorts of mechano-magnetic transducer we adopted the area type one. The displacement of the seismometer pendulum is recorded on a magnetic tape with a small magnet which is attached to the seismometer arm and moves along the surface of the tape in the direction perpendicular to its run. Fundamental experiments were carried out regarding the recording characteristics of this device and it was found that this method of recording can give us sufficient informations about earthquakes of not very small intensities.View full abstractDownload PDF (1870K) -
Kenzo SASSA, Kumizi IIDA1952 Volume 5 Issue 4 Pages 136-140
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSGravity measurements were taken at about 100 stations in Kyoto, Osaka, Hyogo, Nara and Wakayama Prefectures between two weeks from the end of 1951 to the beginning of 1952 with North American Gravimeter.
The purpose of the present measurements is as follows.
1. To know the geophysical meaning of the local ground subsidence by means of repeated gravity measurments.
2. To obtain the relations between the changes in gravity values with time and the seismic activity.
The results contributed to the ground subsidence under the consideration of Bouguer anomaly distributions in Osaka city. The maximum value of changes in gravity values during one year in Kansai districts has been found to be 0.5 milligals.View full abstractDownload PDF (394K) -
Masami HAYAKAWA, Yoshitaka KOTANI, Tokio ICHINOHE1952 Volume 5 Issue 4 Pages 141-150
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSAs results of arranging the gravity values inserted before by Sassa and Iida, a few facts were ascertained.
1 Bouguer anomalies in Osaka City are shown in Tab. I. and Fig. 1 (unit 1 mgal).
2 Changas in gravity in Kansai dietricts between Dec. 1950 and Jan. 1952 (unit 0.1 mgal) are shown in Fig. 2.View full abstractDownload PDF (1027K) -
Hiroyoshi KOBAYASHI1952 Volume 5 Issue 4 Pages 151-157
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSAuthor prospected to research the buildnigs at Hidaka and Tokachi, in Southern Hokkaido, which suffered from the Earthquake of March 4. 1952. And study how buildnigs were distroied by it about the several constructions; reinforced concrete construction, wooden construction, and masonry construction.View full abstractDownload PDF (10983K) -
Sadanori MURAUCHI1952 Volume 5 Issue 4 Pages 157-163
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSA new volcanic isle near the Bayonnaise Rocks, 450km south of Tokyo was discovered by the crew of a Japanese fishing boat, the No. 11 Myojin Maru, on Sept. 17, 1952. The exact location of the new volcanic isle was given by the stuff of oceanography, Tokyo Fisheries University, at 31°56′. 8N. and 139°59′. 5E. and it belongs to Fuji volcanic belt. According to newspapers, the pyroxysmal eruption as well as lava effusion were observed and the radius of the newly-extruded lava isle was 100-150 meters. Also it was reported that since Sept. 21, intermittent severe explosions were observed. On Sept. 23, by the courtesy of Tokyo Fisheries University we could approach the isle and observed explosios five times in one day on board the Shin' yo Maru, a 230-ton training ship of the University. The newly-formed isle had already disappeared under the sea but we could find the position of the undersea crater because the sea water, there, was remarkably yellowish. On the following day, Sept. 24, the No. 5 Kaiyo Maru, a 211-ton oceanographical survey boat of the Maritime Safety Board was missing near the new undersea volcano and all 31 on the ship, including a crew of 22 and nine experts on geology and oceanography were believed to have met tragic end. It was reported afterwards by a survey ship of MSB that a volcanic isle, 300-400m width, was pushed up again and steamed white vapour. The newly-ejectd pumice is quartz-andesitic. The energy of one explosion, occurred on Sept. 23, was estimated to be about 1018 erg. by the writer.View full abstractDownload PDF (773K) -
Ziro SUZUKI1952 Volume 5 Issue 4 Pages 164-169
Published: March 30, 1953
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe resisting force by air damper is not exactly proportional to the velocity of the motion of seismometer, as already pointed out by Dr. T. Hagiwara. Hence the frequency response of the seismometer with air damper is different from that by the ordinary theory of seismometers. The author studied mathematically the motion of the seismometer in such a case, for both free and forced oscillations, and calculated the true frequency response curves. The numerical results of calculations for the seismometer of Ishimoto type (natural frequency; 50c/s, weight of mass; 15kg, sectional area of the damper; 50cm2) are shown in Figs. The difference between the true response curves in the present case and those by the ordinary theory are not always neglisible, especially when the damping coefficient is large.View full abstractDownload PDF (397K)
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