A new reconstructing method of Tsunami attack during the last several thousand years by Sr ratio measurements in a varve of a brackish lake

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This research is to pursue the possibility in reconstructing the history of tsunami attack during the last several thousand years based on Sr isotopic data extracted from an annually laminated sediment core taken in center part of Lake Ogawara in Aomori Prefecture. The Sr isotope could be served as proxy of paleosalinity of environmental waters. As for the Lake Ogawara, the method is problematic because the variations of Sr isotope in the sediment little reflect the past paleosalinity fluctuation inthe bottom water. This is due to the low Sr concentration in the river flowing to the lake.