Geoelectrical Monitoring - landslide Laakirchen (Upper Austria)

The geoelectrical monitoring dataset was acquired on a landslide in Laakirchen, located in the judicial district of Gmunden (Upper Austria). During March 2010, a shallow rotational landslide was triggered by snow melting and intense rainfall, in the vicinity of a renovated house. The particular area is known for its high potential for landslides. From a geological point of view the location is dominated by the so called "Buntmergel" and younger age fluvial sediments. The Laakirchen landslide was monitored by geophysical/geotechnical systems from September 2011 to June 2013. In less than two years, a cumulative displacement of about 70 mm has been recorded at a depth of 3.5 m below ground level by an automatic inclinometer. The orientation of the geoelectrical monitoring profile was parallel to the gradient of the slope, including 61 electrodes, placed at intervals of 1 m. The power supply for the measuring instruments was provided by the connection to the local power grid. Therefore, the number of daily measurements was not limited to electrical power saving reasons. The main purpose of the collection of continuous geoelectrical data was to investigate the correlation between the temporal change of electrical resistivity and the acceleration of the landslide body, which was directly influenced by increased water saturation of the subsurface. Therefore, the recorded temporal changes of electrical resistivity are mainly based on the changes of water saturation and soil temperature. The monitoring period lasts for almost two years (09/2011 to 06/2013) and a complete geoelectrical dataset was collected every 4 hours, consisting of 1765 data points. The data collection was achieved with the Geomon4D system, which was developed by the Department of Geophysics of the Geological Survey of Austria. The provided series of geoelectrical datasets represents raw data, where a very simple preliminary filtering is performed, to eliminate data points that are erroneous due to technical limitations of the monitoring system. This is applied to all data points exceeding the voltage range of -9.95 to +9.95 V or with injection current below 0.5 mA (forward or reverse). Therefore, a comprehensive data analysis, processing and inversion are possible with the published datasets.