Abstract
In the 2016 Kumamoto Earthquake in Japan, two severe ground shakings occurred consecutively on April 14 and 16 in the Kumamoto Region of Kyushu Island, Japan. Extensive damage to structure and infrastructures occurred across a wide region of Kyushu Island. Since the mainshock attacked some structures that had already damaged by the foreshock, it is very difficult to estimate the failure mechanism based on survey after the mainshock. In this paper, the damage of bridges on the plains and in the mountains are summarized and the failure mechanism of Kiyamagawa Bridge in Kyushu Expressway is estimated based on field survey after not only the mainshock but also the foreshock.
