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Volume 101, Issue 5
Displaying 1-17 of 17 articles from this issue
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Akio YOSHIDA, Hiroyuki TAKAYAMA1992 Volume 101 Issue 5 Pages 327-335
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
JOURNAL FREE ACCESSIt is shown that seismic activities in the Mino area, the Tamba area and the Wakayama area, which constitute three circumferential areas of the Kinki Triangle, are correlated each other. The seismic activity in the Tamba area and that in the Wakayama area have a tendency to increase and decrease concurrently, while the seismic activity in the Mino area seems to precede about 3 years the seismic activities in the other two areas. Existence of such correlations indicates that the stress fields in the three circumferential areas of the Kinki Triangle are closely interrelated each other. Further, the precedence of change of the seismic activity in the Mino area suggests that the origin of the prevailing stress field in these regions is attributed to the east side of the Kinki Triangle.View full abstractDownload PDF (1414K) -
The relationship between sedimentary cycle and fluctuation of rock-magnetic intensity and susceptibility in the middle part of the Junicho Formation (late Pliocene)Kohsaku ARAI, Hideo SAKAI, Kenji KONISHI1992 Volume 101 Issue 5 Pages 336-343
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
JOURNAL FREE ACCESSAs exemplified by the middle part (late Pliocene) of the Junicho Formation from Central Honshu (Japan), rock magnetic variability of the outer shelf deposits reveals a so close correlation between the sedimentary cyclicities both in lithologies and molluscan assemblages and the magnetic susceptibility as well as intensity, that a causal relationship between the rock magnetic characteristics and sea level oscillation is advocated. The rock magnetic variability is primarily attributed to the relative abundance of detrital ferromagnetic minerals which is controlled by shifting of proximity of the shoreline as the function of rise and fall of sea level with a short frequency such as few tens kys by glacio-eustacy.
Since a similar, if not identical, conclusion is attained from the both onboard (Davies et al., 1991) and onshore studies (Konishi and Ikehara, 1992) of the Hole 821 A of ODP Leg 133 on the upper shelf slope of the central Great Barrier Reef, it is anticipated that rock magnetic measurement of marine shallow-water sediments can be a viable and efficient means for an analyzing record of sea level change.View full abstractDownload PDF (1353K) -
Estimation and Evaluation of Sea Surface Transport, South of Japan with Sea Surface Temperature DataFundamental Study for Applying Satellite DataKatsutoshi KOUZAI, Kiyoshi TSUCHIYA1992 Volume 101 Issue 5 Pages 344-357
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
JOURNAL FREE ACCESSA simple sea surface transport model with an input of simulated satellite data, namely sea surface temperature, has been developed for estimating surface transport from the surface to the depth of 120 meters, south of Japan during the winter monsoon period of January to February, 1991. Given the first transport estimates from the sea surface temperature data based on the relationship between the geopotential anomaly gradient and the sea surface temperature gradient, the second order partial differential equation was solved for stream function as a non-divergent geostrophic flow under the conditions of non-slip along the coastal boundary. The estimated transport is verified by the transport from the surface to the depth of 120 meters obtained from the data of a shipboard acoustic doppler current profiler (ADCP) and the geostrophic transport estimated from the dynamic calculation along the observation lines. Results indicate that the rms error of transport between the estimated and the observed is about 2.2 Sverdrups (106m3/sec) for the observed maximum transport of about 19 Sverdrups across the Kuroshio in the upper 120 meter layer and the streamlines derived from the transport model was qualitatively in good agreement with the flow field including the path of the Kuroshio. Since the NOAA AVHRR images received during the period of observation were not available for estimating the sea surface temperature due to the winter monsoon cloud cover, a simulated sea surface temperature image was created for analysis by spatially interpolating in situ sea surface temperature data obtained by ships.View full abstractDownload PDF (2103K) -
Junji NISHINA1992 Volume 101 Issue 5 Pages 358-371
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
JOURNAL FREE ACCESSIt is often said that heavier snowfall is obtained in relatively colder Jaunuaries. However, lighter rainfall (not snowfall) may also be obtained then, since colder air contains less water vapour.
This paper compares the distribution of precipitation and snowfall in Japan obtained in both colder and warmer Januaries with that in usual ones. Six Januaries-those of 1963, 1977, 1981, 1984, 1985 and 1986-are selected as the colder Januaries, while six-1964, 1972, 1973, 1979, 1988 and 1989-are selected as the warmer ones. In both cases, the distribution of precipitation and snowfall is discussed and compared with that of usual Januaries (Figs. 3 and 4). Also the “snowfall ratio”, which is defined as the value of the monthly total depth of snowfall per total monthly precipitation, is calculated (Fig. 5). Besides, in order to assume the relationship between the synoptic conditions, the atmospheric pressure pattern in both colder and warmer Januaries is discussed (Fig. 6).
In five of the six colder Januaries, lighter precipitation was usually obtained in almost whole of Japan except for the Hokuriku District (the Japan Sea side of Central Japan) and the western part of Hokkaido, both of which correspond to the landing locations of JPCZ (Japan Seapolar Airmass Convergence Zone) or the generated locations of local anticyclones (or local low-pressure areas). The value of the snowfall ratio is larger, so it can be considered that in a colder January when a heavier snowfall occures, the precipitation usually obtained as rainfall is obtained as snowfall. The value of atmospheric pressure is not always smaller, but a steeper pressure gradient is found. However, in 1963 January, much heavier precipitation was obtained on the Japan Sea side and only lighter precipitation on the Pacific Ocean side. The value of the monthly mean atmospheric pressure was much smaller. Therefore, January 1963 must be considered as an abnormal case.
In five of the six warmer Januaries, heavier precipitation was obtained on the Pacific Ocean side and lighter precipitation on the Japan Sea side, especially the Hokuriku District and the western part of Hokkaido; in 1988 lighter precipitation was obtained in the whole area of Japan. The value of the snowfall ratio was usually smaller, so it can be considered that the lighter snowfall in the warmer Januaries is the result of both lighter precipitation in itself and the rainfall usually obtained as snowfall. The value of monthly mean atmospheric pressure is usually larger, and gentler pressure gradient is found.
This paper emphasizes the general features both in the colder Januaries and in the warmer ones. However some difference is found among both the colder and the warmer Januaries. And these general features do not always fit with Hokkaido or the Pacific Ocean side of Northeast Japan. These problems must be given further consideration.View full abstractDownload PDF (2050K) -
Toshihiko SUGAI1992 Volume 101 Issue 5 Pages 372-382
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
JOURNAL FREE ACCESSIn the Toros Mountains, low-relief surfaces occupy wide area over the high ridges of about 2, 000 m a.s.l. of the Miocene limestone. Tectonic deformation of the area was inferred by characteristic distribution of the large-scale low-relief surfaces. The surfaces are divided into two types ; D (doline) type and S (smooth) type. Most parts of the low-relief surfaces of D type were formed as abrasional surfaces at the nearsea level during the Middle Miocene, though in the northern region of the mountains, part of them are recognised as depositional surfaces of platform limestone composed of calcareous algae. On the other hand, S type surface was formed 100-300 m below the level where D type was originally formed, after the Middle Miocene as a corrosion plain.
The present altitude of the D type surfaces indicates amount of uplift accumulated since the Late Miocene. In the Toros Mountains, two tectonic regions are recognized ; the upwarping area in the eastern part and the northward tilting area in the western part. An uplift rate of the main riges since the Late Miocene is estimated as 0.2 to 0.8 mm/y from the altitude of these low-relief surfaces and their estimated ages.View full abstractDownload PDF (2082K) -
Hiroo OHMORI, Virgilio G. ROIG1992 Volume 101 Issue 5 Pages 383-387
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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Takeshi ISHIBASHI, Koichi NAGAI, Nikorn NAKORNSRI, Chongpan CHONGLAKMA ...1992 Volume 101 Issue 5 Pages 388-390
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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1992 Volume 101 Issue 5 Pages 391
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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1992 Volume 101 Issue 5 Pages 391a-392
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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[in Japanese]1992 Volume 101 Issue 5 Pages 392
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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[in Japanese]1992 Volume 101 Issue 5 Pages 392a-393
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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[in Japanese]1992 Volume 101 Issue 5 Pages 393-394
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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[in Japanese]1992 Volume 101 Issue 5 Pages 394
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1992 Volume 101 Issue 5 Pages 396-407
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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[in Japanese]1992 Volume 101 Issue 5 Pages Plate1-Plate2
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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Tetsuya WARAGAI1992 Volume 101 Issue 5 Pages Plate3-Plate4
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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Toshihiko SUGAI1992 Volume 101 Issue 5 Pages Plate5-Plate6
Published: October 25, 1992
Released on J-STAGE: November 12, 2009
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