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A spatial analysis and it association with liquefaction and ground characteristics

Abstract

This study objective is to assess the damages that caused by the 2011 off the Pacific coast of Tohoku Earthquake, whitch were involving the destruction of building, damage of a marine area due to seismic sea wave liquefaction. Damage due to liquefaction wreaks extensive harm in broad area. So, the presented study focuses on sand boiling phenomenon due to liquefaction in the 2011 off the Pacific coast of Tohoku Earthquake. Sand boiling happens coincide with crack, prominence, subsidence of underground foundation. The simulate liquefaction phenomenon is identified by means of prior studies. Therefore, it is suggested to adopt map mesh approach for liquefaction site in Kuji River and Naka River to mapping a sand boiling. Moreover, this study provides further insights into size of mesh. In the result, 50m mesh suitable for sand boiling map. Objective of preparing sand boiling map is to understand a dimension of liquefaction site. It shows feature of liquefaction site from making the map. In addition, the investigation revealed the liquefaction is linked to the soil history. There is correlation between liquefaction site and ground characteristics including soil history as geotechnical information. As a result, the area with high risk of liquefaction is divided into the category by calculating method of history, the value of liquefaction Potential (PL-value) and liquefaction strength (FL-value) to quantify the history of the earth which is used to evaluate a liquefaction. In this study, analyzing the relevance of space and ground characteristics, which are included the ground history as well as the past occurrence of liquefaction. The study outcome was proposed the technique of mapping the occurrence of liquefaction and characterized by occurrence of liquefaction. In addition, the boiling point has been confirmed and most found many points related to earth history. Next, ground point is divided into the old river channel which has been confirmed liquefaction occurring, and made clear that it is vulnerable to liquefaction due to earthquake.

Key words

Sand boiling, The 2011 off the Pacific coast of Tohoku Earthquake, Liquefaction, Soil history

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