RWTH Fachgruppe Geowissenschaften und Geographie
Logo Lehr- und Forschungsgebiet Neotektonik und Georisiken Fachgruppe Geologie RWTH Aachen
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Equipment













Lab


- sieve analysis (Retsch equipment dry/wet)
- sieves 40cm: 20-8000µm; sieves 20 cm: 500-5000µm
- standard sedimentological analyses
- high-precision analytical balances
- preparations
- microscopy
- core saw

Drilling / Probing


- probing rods with PVC-liner
- window sampling tubes
- Cobra-hammer
- hydraulic rod extracting set
- extension set up to 15 m


It is not always possible to find suitable outcrops for geological investigations, in this case, drilling/probing is necessary. Our drilling system can be operated by two persons and is easily transportable. Investigation depths up to 15 m can be reached in soil and unconsolidated sediments, depending on cohesion and solidity of the underground. Due to the combined methods of window sampling and liner probing, first results can be achieved in the field while analysis of the undistorted samples is possible in a laboratory.


Video hydraulic rod extraction (QuickTime)







Tsunami sediment probing at Cabo de Gata, Spain.


GPR


Hardware
- 100 MHz, 270 MHz and 400 MHz antennas
- survey wheel
- Data acquisition system
- GPS-navigation
Software
- ReflexW processing and 3D-interpretation (Sandmeier Software)
- Petrel 3D-interpretation (Schlumberger)

The GPR (Ground Penetrating Radar, Ground Probing Radar, Georadar) is an active and non-destructive geophysical method for surface near investigations. It is based on the propagation of electromagnetic waves (frequency range 10 MHz to 2 GHz) which are reflected from the underground. At this, spatial resolution increases with high frequencies (up to some centimetres) while the penetration depth is in inverse proportion to the frequency (up to some 10 m). The propagation of electromagnetic waves in solid media is mostly influenced by dielectricity and conductivity, hence GPR is most suitable when those parameters change, for example because of water content, salinity, porosity, cavity, grain size or saturation. Ground Penetrating Radar is used in geology, hydrogeology, neotectonics, sedimentology, archaeology, soil investigation and in the prospection of cavities (pipe and karst detection) and metallic objects like ammunition and cables. We participate in the Georadar Forum.

3D-GPR data on YouTube 1, YouTube 2.

GPR at the Carboneras Fault, Cabo de Gata, Spain. Here, we use the minimal equipment with the SIR 3000 and the 270 MHz antenna










GPR - investigation of Tyrrhenian terraces at Cabo de Gata, Spain.



LIDAR / Laserscanning


- Optech ILRIS 3D Laser scanner
- up to 600 m shot distance
- up to 1 mm point spacing
- up to 9 mm distance accuracy

In cooperation with the chair of Engineering Geology and Hydrogeology, we bought an ILRIS 3D Laserscanning system from Optech Inc., Ontario, CA. This systems allows recording 3D data with a sub-millimeter resolution up to 1 km distance. LIDAR recently has been established as a highly effective method for mine planning, urban planning, industrial survey, historical preservation, infrastructure scanning, accident reconstruction, engineering geology and geotechnical applications. In our work group we concentrate on mass movement monitoring, detailed analysis of active faults, achieving DTMs, and rockfall hazard assessment.

The LIDAR in southern Spain, scanning a roman aqueduct that shows earthquake damages.






- 3D-model of a Roman aqueduct in Baelo Claudia, Southern Spain
- DEM of an open limestone pit in Hesse
- LiDAR data from Madeira island


Magnetic susceptibility


- MS2 Bartington MagSus meter
- MS2K sensor

The magnetic susceptibility of a material gives hints on its composition and origin. We purchased a Bartington MS-2 MagSus meter and a MS-2K sensor for field and trench investigations in cooperation with the Institute of Applied Geophysics.









Geoelectrics


- Geometrics OhmMapper with 5 electrodes

- Lippmann 4-Punkt-Light
- 120 electrodes
- max 5 m electrode spacing

























The traditional way of taking out geoelectrical measurements was to stick electrodes in the ground to supply a current and to pick off a voltage. The distribution of the specific electric resistivity is then interpreted in terms of mineral content, petrology, water content and anomalies.
With the new OhmMapper, ground coupling works capacitively. The benefits are a higher data collection rate and the possibility to gauge sealed or frozen surfaces.
The OhmMapper is used together with the Institute of Applied Geophysics.

Differential GPS (DGPS)


- 216 Universal Tracking Channels
- G3 Tracking Technology (GPS/GLONASS/GALILEO)
- Advanced Fence Antenna Technology - Unsurpassed tracking and performance
- Sophisticated, High Accuracy RTK technology with position updates up to 100Hz
- Bluetooth
- 32GB SDHC storage support
- Robust and modern design
- Accuracy: H: 10 mm + 1 ppm V: 15 mm + 1 ppm


Standard GPS measurements can not be more precise than several meters due to atmospheric influences on the satellite signal. The vertical position is especially uncertain. Differential GPS (DGPS) is a method to overcome this limitation by using two receiver units. One of them is left as a base station while the second one acts as a rover. Both units communicate via radio. By sending a correction signal, a relative (not absolute!) precision of few milimeters only can be achieved.