Geophysical Investigation to Map the Bedrock Depth for Planning Purposes, Kyushu Island, Japan

GBG Australia undertook a geophysical investigation to map the depth to bedrock for planning and construction purposes. For this investigation seismic refraction was utilised to gain information on the depth of bedrock in addition to velocity information for each layer observed.

The seismic refraction data was collected using the Gemetrics Geode seismic recorder. An array length of between 12 channels to 24 channels was used depending on avaliable space with the seismic source being created using a sledgehammer.

All geophone and shot locations were taken using a high accuracy DGPS and levels along the lines were taken using a laser level.


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