Determination of seismic velocities on the Åknes unstable rockslope
In 2017, an eight-geophone string was placed in a borehole on the Åknes unstable rock slope. It turned out that the seismic data is affected by the vibrations produced by the generators on the slope, making difficult the usual processing steps such as the detection of seismic events. However, one can take advantage of the noise itself by using it as a source to estimate some properties of the medium like wave propagation velocities. This may be done by cross-correlating the waveforms recorded at the different sensors.
Working with longer time series will also allow tracking potential velocity changes over time, which in turn could be compared with water level variations.
The student will process seismological and hydrogeological data collected on the active landslide of Åknes. Then, he/she will analyse times series of microearthquakes activity inside the landslide and build a model of active deformation.
Some field campaign is also possible to perform in-situ measurements.