Seismoacoustic Investigations of Buried Karst in the Dam Foundations in the Daugava Basin

P132 SEISMOACOUSTIC INVESTIGATIONS OF BURIED KARST IN THE DAM FOUNDATIONS IN THE DAUGAVA BASIN V. LISVIN High resolution seismoacoustic and shallow seismic methods and the equipment are discussed for investigations of buried karst and increased water infiltration zones in the dam foundations in the Latvian part of the Daugava basin. Multiwave approach to the shallow CDP seismics and VSP data interpretation together with subbottom seismoacoustic profiling provide information for planning of the repair and maintenance work on the dams. 1 Interseis Energetiku Str. 1-9 2121 Salaspils Latvia Introduction After the filling of reservoirs of the hydroelectric power station cascade on