The authors have performed literature surveys on July 28, 1889 Kumamoto earthquake taking an opportunity of the occurrence of 2016 event in Kumamoto Prefecture. In the previous papers, reconnaissance reports, newspapers and archived Kumamoto prefectural documents at that time were surveyed. In this paper, detailed damages in Kumamoto city are picked up from these documents. Damage distribution and each building details are disclosed and plotted on a map newly reproduced from the topological map and street map at that time. Damage concentrations in northern and southern districts and ground failures along the old river traces are extracted.

Experiments on influences of volcano ashfall on building air conditioning equipment are performed. In the experiments, cumulative ashfall depths that can affect the operations of an exterior unit and a cooling tower are mainly concerned because they are placed outdoor and are exposed to ashfall directly at the time of volcano eruption. Through the experiments, cumulative ashfall depths are found to be 10-20mm and 20-30mm for the external unit and the cooling tower respectively, when their operations begin to be recognized deviated from their normal performances.