Attempt for improvement of liquefaction hazard map making more of land condition

Abstract

Abiko City fully revised 'Abiko disaster prevention map' based on the new analysis of seismic hazard with the support by the 'GSI disaster prevention information support team' and distributed it to its citizens in May 2013. Upon analysis, micro-topography classification map was newly created using aerial photographs, old topographic maps and land condition maps. To avoid the ignorance of detailed information of the classification through averaging by meshing, liquefaction risk was estimated directly from the polygon data of the classification. In the newly printed map, a column describing how these maps were created was included.