ABSTRACT
The vibrations of the soil surface were measured for the documentation of the surface wave propagation.
3 MEASUREMENTS ON THE TOWER
The ambient vibrations of the Leitturm-structure were measured with three very sensitive geophones (Lennartz LE-3D-5s) on different levels. The Fast
Fourier Transformation (FFT) analysis of the measured data of vibrations on the 11th floor shows the eigenfrequency of 1.6 Hz for the tilting motion in the “weak”, y-direction and 2.0 Hz in the “stiffer”, x-direction.
