Progress in the geoscientific exploration of the Asse salt structure as a base for the construction of a new mine for the retrieval of radioactive waste from the Asse II mine

An innovative approach: Combining OTV logging and manual core logging for geotechnical site investigation - A case study from Lesser Himalaya of eastern Nepal

“…The sinusoidal projections of the structures were chosen from the images. The projections of foliations and fractures were represented by several sinusoidal legends, whose spatial orientations were calculated using the approach introduced by Pollok et al (2018). The resulting dips could be further displayed as a rose diagram, histogram, or stereo plot using various software like Dips (RocScience) and Excel.…”

“…Although considered less important, the use of ATV concerning the quantitative characterization in a field scale is more common than OTV for geotechnical site investigation. Many researchers (Kao et al, 2020;Schepers et al, 2001;Pollok et al, 2018) have explained the significance of ATV in the geotechnical investigation; while very few (Wedge et al, 64 2017) have compared the performance of ATV and OTV only in terms of structural interpretation. The study incorporating a comparison of the OTV logs with continuous drilled core logs on the geotechnical investigation on a field scale is lacking; while not a single one exists within the Nepal Himalaya.…”

Passive Seismic Interferometry as a Tool for Seismic Imaging from Mine Galleries

“…The mine is currently operated by the federal company for radioactive waste disposal, and is located approximately 70 km south-east of Hanover at the western end of the 25-km-long, NW-SE trending Asse-Jerxheim salt structure. The Asse-Jerxheim salt structure is part of the western Subhercynian Basin built up by anticlinal-uplifted Late Permian Zechstein evaporites and Triassic sediments (Pollok et al 2018). Within the complex internal structure and composition of the Asse-Jerxheim salt structure, initially, flat-bedded Zechstein evaporites developed to a salt pillow in the Jurassic and were compressionally deformed in the Late Cretaceous.…”

“…Shortening, accompanying the inversion, led to intrusion of the Zechstein salt dome into the southwestern part of the Triassic overburden forming a "salt wedge". Hence, at its southwestern flank, the salt wedge is joined to the geological units of the Triassic Upper Buntsandstein (Pollok et al 2018).…”

Active and Passive-Source Underground Seismic Data Acquisition

“…Subsequently, we combine the horizontal and the vertical seismic sections to enhance the signal-to-noise ratio and to increase the reflection amplitudes (Figure 3). is joined to the evaporites of the Triassic Upper Buntsandstein (Pollok, 2018).…”