Geophysical Data (GPR, ERT, Seismic) Duvensee 2019

Data Structure

A GSSI GPR Antenna with 200 MHz frequency was used to perform common offset data acquisition in the Duvensee area. The presented profile (50 m long) is part of a survey made in November 2016.

Geoelectric measurements were conducted using a PC-controlled DC resistivity meter system RESECS (Geoserve) with 96 electrodes. The electrode spacing was 0.5 m (total length of the profile 47.5 m) and we measured Dipole-Dipole and Wenner-Alpha arrays. Electrode locations were determined by a Differential GPS (Leica Geosystems AG, Heerbrugg, Switzerland).

Direct-Push (DP-EC) logging was conducted using a Geoprobe SC520 soil conductivity probe, which is composed of four electrodes in linear arrangements and was operated in a Wenner array enabling a vertical resolution of 0.02m (www.geoprobe.com). The electric current and voltage are constantly measured with depth and used for the calculation of electric conductivity in mS/m. This equipment was used to measure at the location of core I.4 and the values have been compared also with the measurements carried out in the laboratory.

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In the laboratory, the electric resistivity of drill core segments was measured using an earth resistivity meter connected with four electrodes in Wenner-Alpha configuration (5 mm long and 5 mm distant with a diameter of 1 mm). The quadrupole was inserted into the sediment, ensuring the contact between the electrodes and the ground. The surface contact area of the electrodes is about 1mm2. Corings were conducted using an Usinger piston corer, proceeding with 1mdepth increments along a 50 m long transect, which has been taken as a reference profile. The stratigraphy was described in the laboratory.

We conducted a seismic profile, which was oriented in the dip direction of the local underground. We excited S-waves by horizontal hammer blows against a steel bar, which was coupled to the ground by steel spikes. The blow direction was perpendicular to the profile, i.e., in the strike direction of the local underground. Therefore, the excited S-waves were SH-waves. The data were recorded with three Geometrix Geode seismographs, equipped with horizontal geophones.

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