Survey on Quake Damage in the Ruins of Bagan, Myanmar

　On August 24th, 2016, a magnitude 6.8 earthquake with its epicenter in the central part of Myanmar struck; as a consequence, the ruins of Bagan, one of the representative cultural assets of the nation, suffered serious damage. The group of ruins in the region includes more than 3,000 brick Buddhist stupas and small temples built mainly in the 11th to 13th centuries. According to the Department of Archaeology, National Museum and Library, Myanmar Ministry of Religious Affairs and Culture, 389 of these sites were discovered to have been damaged (as of the end of October 2016).
　Following the dispatch of an advance inspection team in September,2016, the Tokyo National Research Institute for Cultural Properties (TNRICP) was commissioned by the Agency for Cultural Affairs to oversee a project to provide emergency aid and sent a party of eight specialists (on conserving cultural assets, repairing buildings, structure of buildings, and surveying) to the sites with the aim of identifying the actual state of quake damage to valuable cultural properties, from October 26th through November 10th, 2016. They conducted surveys from four standpoints, namely, the situation of damaged historical buildings, the structural analysis of damaged buildings, the situation of emergency protective measures, and the analysis of records of damage.
　The ruins of Bagan sustained quake damage in 1975 as well, and a large number of structures had been restored or rebuilt thereafter. As a result of the current inspections, however, it was discovered that much of the damage from this earthquake was concentrated on the newly reconstructed parts or the boundaries between the newly repaired parts and old parts, such as a tower of the upper part of a building. Moreover, deformation or cracks existing in vaults, walls or podiums owing to age are believed to have been aggravated by the earthquake. Meanwhile, thanks in part to prompt actions by local residents and volunteers under the leadership of local authorities, emergency protective measures appear to have been taken in an expeditious manner.
　With an eye toward subsequent restoration, we must identify the cause and mechanisms of damage by not only conducting further inspection but also discussing the technical and philosophical issues that are common to the conservation of brick architectural heritages in earthquake-prone regions, such as how to reinforce a structure, melding of traditional techniques and modern counterparts, and the validity of reconstructing damaged parts.