Abstract
This study aims to make a quantitatively evaluation for total amount of direct earthquake damage loss accompanying liquefaction potential change at the Osaka City area in case of inland and plate-boundary earthquakes. The major findings are as follows; 1) The estimated total amount of direct damage loss at current ground water level reached on 9.6 trillion yen for inland earthquake and on 2.5 trillion yen for plate-boundary earthquake, respectively. 2) In case of existing water level dropped down to 3m, the decrease amount of direct damage loss will be 2.9 trillion yen and 100 billion yen, respectively. 3) In future earthquakes, management of ground water level is one of effective measures for mitigating the economical damage loss in mega-cities.
