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Volume 36 (1995 - 199･･･
- Issue 6 Pages 401-
- Issue 5 Pages 322-
- Issue 4 Pages 268-
- Issue 3 Pages 188-
- Issue 2 Pages 106-
- Issue 1 Pages 1-
Volume 36, Issue 2
Displaying 1-6 of 6 articles from this issue
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Kazuo SUZUKA, Fumio WATANABE, Kyoji FUKUDA, Satoru TAKAHASHI, Kiyotsun ...1995 Volume 36 Issue 2 Pages 106-115
Published: June 10, 1995
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSWhen the soil charged in vessel is tamped by the rammer, the soil temperature rises by heat generation. As a result of this experimental studies, it has been recognized that the rising temperature offers one of the best possibilities of indicating the physical properties of soil particles.
As one of the process of weathering is change of the physical properties of soil particles itself, the rising temperature shall become an material of judgement for the weatherd degree of the decomposed granitic soil.
And so, we tried to measure the rising temperature. The results are as follows:
1. The rising temperature has relation with the other index of judgement for the weatherd degree, for example, the degree of change in qualities of mineral, fine void contents, specificsurface and ignition loss etc.
2. As compared with the decomposed granitic soil of low weatherd degree, the decomposed granitic soil of high weatherd degree get higher rising temperature.View full abstractDownload PDF (1407K) -
Seisuke MISAWA, Hiroshi KITAMURA1995 Volume 36 Issue 2 Pages 116-143
Published: June 10, 1995
Released on J-STAGE: August 24, 2010
JOURNAL FREE ACCESSA simple induced polarization method in time domain measurement is apllied to the investigation for ground water. The procedure in di-pole di-pole array is to measure the electric value (Vp) between the poles after 2.5 s electrical current (I) and to measure the electric value (Vs) 0.5 m/s just after current cut. Using the measured values, an apparent resistance ratio, a percentage of induced polarization and a percentage of possible charge are calculated.
(1) (3)
(2) (4)
where,
ρ: apparent resistance ratio (Ω·M),
M: percentage of induced polarization (%)
MA: percentage of possible charge (at the depth shallower than 100 m from surface),
MB: percentage of possible charge (at the depth deeper than 100 m from surface),
a: distance between the poles (m),
n: coefficient of isolation,
Vp: potential differece between potencial poles (mV),
Vs: potential differece between potencial poles at 0.5 m/s just after current cut (mV),
I: electric current in earth (mA).
The area and amount of the hidden ground water can be inspected by utilizing apparent resistivity, polarization ratio chargeability more acculately than the ordinal method using only the p value. Describing the principle and method of measurement, this paper shows the efficiency of the proposed procedure for the ground water investigation with the survey at five different geological condition.View full abstractDownload PDF (8181K) -
Takasi SAKURAI1995 Volume 36 Issue 2 Pages 144-153
Published: June 10, 1995
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSThe damage caused by the Southern Hyogo-ken Earthquake 1995 suffered not only wooden houses but also reinforced concrete structures such as highway, railway and modern building, that is unbelievable in the case of heavy vibration in large earthquake occuring at a far away position. The observation results of the damage make the auther to conclude the reason as follows. At least, from Kobe city to Nishinomiya city, there exsited an unfounded active fault in subsurface ground and it moved with right lateral sense. The fault activity caused the ground surface displacement. Namely, the earthquake damage is estimated to be owing to mono-lateral ground displacement with rebound motion due to the fault displacement.View full abstractDownload PDF (8745K) -
Jun MINAGAWA, Kenshiro OTSUKI, Masao AONO, Junichi OTOMO, Norihiro NAK ...1995 Volume 36 Issue 2 Pages 154-166
Published: June 10, 1995
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSHyogo-ken Nanbu earthquake (magnitude 7.2) at Jan.17, 1995 was associated with ground surface fault displacement along the neotectonic Nojima fault on the Awajishima Island, Hyogo Prefecture, Japan.The characteristics of the Nojima seismic fault and the earthquake damage are follows.
1) The seismic fault was formed just on the NE-SW trending Nojima active fault which was recognized on the boundary between the southeast mountainous part and the northeast hilly land.
2) The on-land seismic fault trace in over 9 km long.The maximum right-lateral displacement and northwest side throw attains 1.7m and 1.3m respectively.
3) The seismic repture which started at a point in the Akashi strait and propagated southwestward, stopped at the fault jog at Tomishima associated with some small scale fault branches.
4) The seismic faulting was associated with various fault structures on the ground surface affected by the thickness of the surface soft sediments; right-lateral offset, fault scarplet, small scale landslide, undulation and distortion of ground surface, left-step echelon gash, pull-apart and push-up, and mole track.
5) The fault striation at Nashimoto village, near the southern end of the Nojima seismic fault, is horizontal. In Hirabayashi village which is on the middle part of the fault trace, three striations with different orientations were observed;70°N at first, 20°N secondly and 30°S finally, suggesting the displacement splitting at the fault propagation.
6) The earthquake damage, including the collapse of houses and irrigation ponds was concentrated not only in the narrow about 20 m in width on the both sides of the seismic fault but also in the areas on the soft ground.
7) The shear zone of the Nojima fault has a zoned structure;granitic cataclasite, thin alternation of consolidated and very fine grained and consolidated gouge and pseudotachylyte-like rock, sheared Miocene sandstone and unconsolidated fault clay, representing rocks formed in the various depths.
8) The after-slip attains 20 cm at the 55th after the main shock.View full abstractDownload PDF (3481K) -
Takashi SAKURAI1995 Volume 36 Issue 2 Pages 167-172
Published: June 10, 1995
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSDownload PDF (862K) -
Akira IWAMATSU1995 Volume 36 Issue 2 Pages 173-177
Published: June 10, 1995
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSDownload PDF (321K)
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