A SURVEY METHOD OF TSUNAMI INUNDATION AREA USING CHEMICAL COMPONENTS IN TSUNAMI INUNDATED SOIL

Abstract

 A severe earthquake of Mw 8.8 occurred on 27 Feb. 2010 at Chil and the subsequent tsunami attacked the coast. The field survey was conducted in Chile to develop a new survey method based on a chemical analysis of soil. The soil samples were obtained from both the inundated and the not-inundated area and the content of water-soluble ions, electric conductivity (EC), and pH were measured. The tsunami inundated soil contains much water-soluble ions and the discriminant analysis of the tsunami inundation using the amount of ions in the soil showed high discriminant accuracy (over 90%) with Na⁺, Mg²⁺, Cl^-,Br^-, SO₄^2-, and EC.