Situation of Damage in and around Kathmandu Valley due to the 2015 Gorkha Nepal Earthquake

抄録

 An earthquake with a moment magnitude of 7.8 occurred at 11:56 NST (local time) on 25 April 2015, in the central part of Nepal (Gorkha). First damage surveys were conducted at the affected area during 26 May to 21 July three times by the team of NIED. This paper outlines the findings of the surveys on the various spects of the earthquake disaster in the Kathmandu Valley. Some of the observations are that the main damage was to masonry buildings especially with mud mortar, but limited to RC buildings, and the historical buildings with renovation showed smaller damage. Thus, low cost retrofitting method will be necessary for mainly in suburb housings rich in masonry buildings with mud mortar. According to the comparison with the past risk assessment project results (JICA, 2002), these were found that the effects by the 2015 Gorkha earthquake were less than those due to the 1934 Bihar-Nepal Earthquake, and the similar features were found in both the 1833 Earthquake and the 2015 Gorkha Earthquake. Primarily, the first survey was to collect timely raw information on the damage to buildings and to confirm the availability of data and their sources for subsequent surveys. The motivation for the thread survey was to obtain ground truth data to calibrate. These may help the future earthquake disaster mitigation efforts.