DOI: 10.24341/tethys.178
title: Geoelectrical Monitoring - landslide Laakirchen (Upper Austria)
title: Geoelektrisches Monitoring - Hangrutschung Laakirchen (OÖ)

description: 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.
description: The published dataset consists of more than 2900 individual geoelectric depth sections that were acquired over a period of almost two years. Each individual depth section can be inverted into a 2D model of the electrical resistivity of the subsurface. The temporal change of these models represents the essential information content of this dataset. The geoelectrical monitoring was carried out with the measuring system (Geomon4D) developed by the Department of Geophysics of the Geological Survey of Austria, which is specially designed for monitoring application. The measuring point distribution (in total 1765 measuring points per depth section) corresponds to the so-called multiple-gradient array. The geoelectric monitoring profile consists of 61 stainless steel electrodes with a constant electrode spacing of 1 m.
description: Der publizierte Datensatz besteht aus über 2900 einzelnen geoelektrischen Tiefensektionen, die über einen Zeitraum von knapp zwei Jahren aufgenommen wurden. Jede einzelne Tiefensektion kann mittels Inversionsrechnung in ein 2D-Modell des spezifischen elektrischen Widerstandes des Untergrundes umgesetzt werden. Die zeitliche Änderung dieser Modelle stellt den wesentlichen Informationsgehalt dieses Datensatzes dar. Das geoelektrische Monitoring erfolgte mit einem an der Geologischen Bundesanstalt entwickelten Messsystem (Geomon4D), das speziell für den Monitoring Einsatz konzipiert ist. Die Messpunktverteilung (in Summe 1765 Messpunkte pro Tiefensektion) entspricht der sogenannten Multiplen-Gradienten-Anordnung. Das geoelektrische Monitoring Profil umfasst in Summe 61 Edelstahlelektroden mit einem konstanten Elektrodenabstand von 1 m.