| dc.description.abstract | The P-Receiver functions(RFs) at 8 temporary seismic stations named KONO1 to KONO8, located in a 100x100 km region around Kongsberg (Norway) are analysed in this thesis. RFs use S converted waves arriving at the seismological station after the main P-wave, to detect impedance contrasts beneath the seismic station, and is utilized in particular to find Moho depth beneath a station. The stations used in this thesis, are placed within and outside of the Oslo Graben. The data are provided by the interactive database IRIS for the permanent station KONO, and NORSAR for the eight temporary stations(KONO1-8). 219 seismic events were selected within the time frame April 2018 to September 2019, of which 150 could be used to produce receiver functions of acceptable quality. The results from the single receiver functions were analysed. We also stacked receiver functions from events in 3 regions(Japan, Philippines and Indonesia, Alaska and Canada) in order to enhance the signal-to-noise ratio and get a better view of the converted and reflected waves in the crust. This enables is to analyse how the RFs vary with the back azimuth of the source region. From this it is found that KONO4, KONO5, KONO6 and KONO8, which lies farthest away from KONO, gives similar RFs in different back azimuths. This means that all three stacking areas that are mainly used in this thesis can be further stacked together for each of these stations, to try and enhance the crustal arrivals and subsequently perform a formal inversion. While KONO1, KONO2 and KONO3, which lies closest to KONO, gives different RFs depending on their back azimuth and might indicate a dipping lower crustal layer, a dipping Moho, scattering of waves, anisotropy or structural heterogeneity. KONO1, KONO2, KONO3 and KONO4 show a negative arrival at 10s that was also found in previous studies. Based on the arrival time this might indicate the arrival of a PPmP, or may be a mantle reflection. KONO4 is however located further away from KONO, and the negative arrival is probably not caused by the same structure as at KONO, KONO1, KONO2 and KONO3. The Ps- wave has a high visibility at KONO, KONO1, KONO2 and KONO3, in the west, while the events arriving from the east display the PPmP-wave. This can be explained with a more complex Moho. However, KONO4 show strong arrivals of the Ps-wave in all directions, also the direction that displays PPmP-arrivals, and thereby indicates a more complicated structure. | eng |