PHYSICAL AND DYNAMIC PROPERTIES OF THE SHALLOW SEDIMENTARY ROCKS IN THE BUCHAREST METROPOLITAN AREA

New seismic measurements are performed in the Bucharest area with the purpose of defining better the physical and dynamic properties of the shallow sedimentary rocks. Down-hole seismic measurements were performed in a number of 10 cased boreholes drilled in the Bucharest metropolitan area. Processing and interpretation of the data lead to the conclusion that shallow sedimentary rocks can be considered weak in the area, down to 150-200 m depth. Seismic wave velocity values and bulk density values presented in the paper associated with local geology are useful primary data in the seismic microzonation of Bucharest City. They are used as 1D models to derive transfer functions and response spectra for the stack of sedimentary rocks in several parts of the Bucharest area, leading to a better knowledge of the local site amplification and associated frequency spectra.