Subsurface structure around Wakayama plain using borhole database
Abstract
Kansai Geo-informatics Network (KG-NET) is organized as a new system of management of GI-base in 2005. This organization collects the geotechnical and geological information of borehole data more than 60,000 data. GI-base is the database system of the KG-NET and platform to use these borehole data. Kansai Geo-informatics Research Committee (KG-R) is tried to explain the geotechnical properties and geological environment using borehole database in Kansai area. In 2012, KG-R established the 'Shin-Kansai Jiban Wakayama plain', and explain the subsurface geology and characteristics of geotechnical properties. In this study we introduce this result and consider the sedimental environment and characteristics in this area.
Wakayama Plain is located in the south part of Kinki district. Median Tectonic Line is distributed in the Northern edge of the plain and Kinokawa running through the central part of the plain. Basement rock is consisted in the sediment rock that originated accretionary prism and plain is tilted toward to the north. In the bay area marine clay layered distributed due to the sea level change, however, in land area is almost sand layers. Between the bay area and in land area, sand bar is growth toward north to south. According to the GI-base, marine clay distributed near to the sand bar and sand and marine clay are contemporaneous heterotopic facies. In order to understanding of the environmental geology, we carried out to borehole drilling survey and reveal the sedimental environment using microfossil analysis. The result of this study, the north area is consisting in the delta sediment and south area has superiority mud and clay sediment according to the back marsh. These sedimental environments are closely related to the activity of the Median Tectonic Line.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMEP41B2673K
- Keywords:
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- 1810 Debris flow and landslides;
- HYDROLOGYDE: 1824 Geomorphology: general;
- HYDROLOGYDE: 1862 Sediment transport;
- HYDROLOGYDE: 3265 Stochastic processes;
- MATHEMATICAL GEOPHYSICS