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| | Abstract | | The Landsonar and Differential electric sounding method were new technique used in recent years. Good results from shallow engineering surveys have been obtained. Tests on obtaining thicknesses an velocities of near-surface layers were conducted by combining the two approaches. With hammer sources, satisfactory results were obtained at depth of about 60m in surveying the Quaternary layers in the Shengli oilfield and at depth of about 150m in the mountainous areas of southern Guizhou. |
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