The Relationship between Fill-Depths Based on GIS Estimation，Earthquake Damage and the Micro-Tremor Property of a Developed Hill Residential Area
geographic information systems
the 2001 Geiyo earthquake
The 2001 Geiyo earthquake which measured 6.7 on the Richter Scale caused a lot of damage to the roof-tiles of wooden houses. This damage was more prevalent among houses in the fill part of the hillside than those of the cut part. The developed area is classified as either a fill part，or cut part，based on GIS Geographic information systems. The ratio of the horizontal spectrum to the vertical spectrum，known as H/V and based on the micro-tremor measurement of the ground，reaches a peak of approximately 2-4 Hz in the fill part. However，it has no predominant frequency on the cut part. It is probable that the damage done to houses with tiled roofs caused by the 2001 Geiyo earthquake is strongly linked to the predominant H/V frequencies found in the housing site.