Consideration of influences stemming from differences in local features and disaster characteristics are necessary to grasp economic damage (both from direct damage and indirect damage) quickly and correctly. An econometric approach to estimate economic damage attains correct estimation of economic damage, when it is difficult to find the time and financial support for conducting largescale investigations and analysis of the vast quantity of data. Moreover, the amount of economic damage by natural disaster types cannot be divided, so the economic damage for every disaster cannot be acquired. Using the data of the Chilean Earthquake Tsunami that influenced Japan by a tsunami but not an earthquake in 1960, this study proposed a continuity compensation formula with the influential factors of tsunami height and relationship between the direct economic damage by the tsunami and the financial resources of the people. Moreover, we propose an analysis method for a reconstruction plan making use of the formula to estimate the amount of direct economic damage, and conducted a basic study toward evaluating the effects of reconstruction plans after the Tohoku Earthquake.