Hazards of active faults and propriety of land-use control on fault traces

概要

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In Japan, many people have believed that the areas along active faults are the most dangerous places when fault movement recurs. They have been anxious about the collapse caused by fault displacement of buildings standing on fault traces. Although movement of an active fault beneath the Kobe and Awajishima region indirectly caused the destructive seismic disaster of the 1995 Hyogo-ken Nanbu Earthquake, no clear relationship was found between the concentration of damages and the traces of surface fault break. This fact indicates that the real hazards of fault movement are not restricted to within the narrow zone along the fault trace. There are two reasons why active faults are dangerous to people in Japan. One is that an active fault will cause severe seismic disaster through the occurrence of a large earthquake with shallow focus. The other is that fault movement will cause the functional breakdown of the national lifelines. When these lifelines are broken and suspended for a long period. social and economic confusion will occur not only in Japan but also on an international scale. Therefore, the government should reconsider and reinforce useful measures against active faults in Japan. The author proposes here how the hazards and land-use control along the active faults should be managed reasonably and realistically based on information concerning the severe damage caused by the Hyogo-ken Nanbu Earthquake.
首都大学東京の論文
1996-04-00