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The distribution of the damage caused by the earthquake in Valdivia in relation to the form of the terrane

INSTITUTO DE GEOGRAPHIA UNIVERSIDAD AUSTRAL DE CHILE
US NAVAL ORDNANCE TEST STATION, CHINA LAKE, CALIF.

Abstract

The western part of the city of Valdivia is more severely damaged than the eastern part. This is because the eastern part is underlain by a firm continuous bed, actually a terrace, of cancagua, a fine-grained soil composed of volcanic ash. The western part consists of a discontinuous surface marked by isolated mesa-like remnants of this terrace, surrounded by soft, incompetent fill. Vibration of the mesa-like columns was severe because of the lack of contiguous support at the contact with the incompetent fill material. Construction on artificial fill was very seriously damaged.

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