DOI: 10.24341/tethys.5
title: Geoelectrical Monitoring - landslide Ampflwang (Upper Austria)
title: Geoelektrisches Monitoring - Hangrutschung Ampflwang (OÖ)

description: The geoelectrical monitoring dataset was acquired on a landslide formed after a house construction within the area of an old deep-seated landslide near to the town of Ampflwang (Upper Austria). The deep-seated landslide developed mostly in quaternary slope/landslide deposits and anthropogenic deposits, situated above the underlying Neogene rocks, i.e.: fluvial gravels of Hausruck Formation at the top, limnic to fluvial coal-rich clay with brown coal beds of Ampflwang Formation in the middle, and marine silty-sandy marl to silty sand of Ottnang Formation at the base. The small part of the old deep-seated landslide reactivated in March 2010, was observed by topographic changes and inclinometric data. It is about 110 m long, 40 m wide, 4 m thick and represents a shallow rotational-translational landslide of an elliptic shape and quite smooth topography. The surrounding infrastructure (e.g. terrace, sewage pipes) of the newly constructed family house was partly damaged by the landslide. 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 the electrical resistivity are mainly based on the changes of water saturation and soil temperature. The monitoring period lasts for almost one year (12/2010 to 09/2011) and a complete geoelectrical dataset was collected every four 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 1600 individual geoelectric depth sections that were acquired over a period of almost one year. 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 1600 einzelnen geoelektrischen Tiefensektionen, die über einen Zeitraum von knapp einem Jahr 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.