Geo-pollution Science, Medical Geology and Urban Geology
Vol.3 No.3/4 2007

ContentsArticles
26

The development of landforms in Bac Coc village, Nam Dinh prefecture, Vietnam : Viewed in electric survey
Shigenobu HIRAIDE, Shigeko HARUYAMA, Hiroomi NAKAZATO, Kazuaki HORI, Susumu TANABE,and Le Quoc DOANH

42

The problem in policy for safety of Specified Investigation Organization System of Soil Contamination Countermeasures
Law
Masaru HOMMA

Report50

Geological damage by the Noto Hanto Earthquake in 2007
Osamu KAZAOKA, Takashi KUSUDA, Kunio FURUNO, Yutaka KASAHARA, and Takayuki KAWABENews62

The development of landforms in Bac Coc village, Nam Dinh prefecture,Vietnam : Viewed in electric survey
Shigenobu HIRAIDE1, Shigeko HARUYAMA2, Hiroomi NAKAZATO3, Kazuaki HORI4, Susumu TANABE5,and Le Quoc DOANH6
1: Environment Department, Yokosuka City 11, Ogawa-cho, Yokosuka, 238-8550 Japan
2: Graduate School of Frontier Sciences, The University of Tokyo 5-1-5, Kashiwanoha, Kashiwa, 277-8561 Japan
3: Research Institute of Agricultural Engineering 2-1-6, Kannondai, Tsukuba, 305-8609 Japan
4: Department of Environmental Science and Technology, Faculty of Science and Technology, Meijo University 1-501, Shiogamaguchi, Nagoya, 468-8502 Japan
5: Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology Central 7, 1-1-1, Higashi, Tsukuba, 305-8567 Japan
6: Vietnam Agricultural Science Institute Tahnh Tri, Hanoi, Vietnam

Abstract
As the topography in the vicinity of the region investigated in this research falls under the wave dominated system and it isalso adjoined with fluvial dominated system distributional areas, it is an important site in order to know changes in thegeomorphic environment of the Red River delta. Further, as this region is situated in a low-lying area, it is considered that, evenwith just several tens of centimeters of sea level change, there would be an influence on rice crops, etc. Consequently, as a resultof past changes in the hydrological cycle and the physical environment, clarifying the historical development of landform has
great significance in predicting the environmental changes of this region in the near future.
In this research, together with conducting resistivity method vertical electric sounding, surface sediment sample resisitivity
metering experiments were conducted and through these we gained an understanding of the underground structure andexamined the historical development of the landform. Through altitude of basement spatial distribution of flood plain sedimentand natural levee sediment estimated through resistivity method vertical electrical sounding, the geomorphic development of theregion can be generally classified into four stages. Stage 1 is regression period, Stage 2 is river A, B domination period, Stage 3 isnatural levee erosion period and Stage 4 is the present landform.

Keyword: Historical development of landform, Resistivity method vertical electric sounding, Red river delta

The problem in policy for safety of Specified Investigation Organization
System of Soil Contamination Countermeasures Law
Masaru HOMMA
Meiji University Law School 1-1 No.14, Kanda-surugadai, Chiyoda Ward, Tokyo,101-8301 Japan

Abstract
The falsified earthquake-resistance data affair occurred in 2005. In Japan, there is a high risk about the real estate quality ofconsuming public (B to C) dealings with the real estate agency or the real estate quality among dealers (B to B).
The structure of this affair is that there are deep-rooted problems in construction and the real estate policy including the law
system and thought. Moreover, the administration does the investigation work for the examination to a private specified
investigation organization in the Soil Contamination Countermeasures Law and the Building Construction Standards Law. The
ideal way of this examination system has the necessity of the reexamination.

Keyword: Nongovernmental consignment screening, Confirmation principle

Geological damage by the Noto Hanto Earthquake in 2007
Osamu KAZAOKA1, Takashi KUSUDA1, Kunio FURUNO1, Yutaka KASAHARA1, and Takayuki KAWABE2
1: Research Institute of Environmental Geology, Chiba 3-5-1, Inagekaigan, Mihama-ku, Chiba , 2261-0005 Japan
2: Faculty of Education, Art and Science, Yamagata University 1-4-12, Kojirakawa, Yamagata , 990-8560 JapanAbstract
The Noto Hanto Earthquake in 2007 hit Noto peninsula at March 2007. About one-third of the peninsula shook on JMA seismic intensity 6upper and about four-fifth of the peninsula shook on over 5 upper at the earthquake.
Some of banks of Noto toll road, which is about 10km southeast of epicenter, collapsed by strong S wave with radial direction. Many of failedbanks located on the uppermost part of gorges with rich in spring. The banks, composed of matrix supported gravelly mud, did’nt have been
included drainage system.
Large sand volcano with about 20m diameter distributed on reclaimed land in Fushiki port, about 60km southeast of epicenter. Trench sections
on through the sand volcano vent were observed. Geology was investigated arround the sand volcano by simple dynamic corn penetration tests.
From these data it may be inferred that the artificial formation liquefied in from about 1m to about 4m depth. Then the liquefied sand jetted out
through joint with east-west strike and low-angle south dip.
Most of the wooden buildings were damaged on Hashiride, Tachi and Touge in Momzen-machi, Wajima city near the epicenter.
These area were on alluvial fans. But little wooden building damaged on sand dune and the Miocene formation in Touge. Furtherdamage on east part and west part of the fan are more serious than it on center part there. It is considered that the cause of these different damage
are change of thickness and facie of alluvial deposits.

Keyword: The Noto Hanto Earthquake in 2007, Slope failure, Liquefaction-Fluidization, collapse of wooden buildings