%0 Conference Paper %1 koch_etal:2004 %A Koch, O. %A Helwig, S. L. %A Meqbel, N. %A DESERT Group, %B Proceedings of the 17th Workshop on Electromagnetic Induction in the Earth %C Hyderabad, India %D 2004 %K geophysics %T Vertical near surface conductivity anomaly detected at the Dead Sea Transform %U http://www.emindia2004.org/abstracts.htm %X Within the Dead-Sea-Rift-Transect-(DESERT)-project seismic, seismological, electromagnetic, gravity, magnetic, geodynamic and geological studies were done at the Dead Sea Rift/Dead Sea Transform (DST) to give answers to the question: How do shear zones work and what controls them?. Most of the small scale experiments were located at the Araba fault, which is the main fault of the DST-system between the Dead- and Red-Sea. Seismic measurements in the Araba valley done by Maercklin 2003 provided a view of the p-wave velocity distribution of the subsurface in the fault region. Haberland et al. 2003 performed a seismic experiment at the Araba fault which showed the existence of guided waves within a narrow channel of 3-12 m width. They correlated this narrow vertical layer to the damage zone of the Araba fault. In March 2004 the Institute of Geophysics and Meteorology at the University of Cologne investigated the near-surface conductivity structure of the fault area with TEM measurements. These measurements were accomplished with a new 3-component-TEM antenna attached to a three channel Nanotem receiver. Using this setup, we were able to record horizontal and vertical signals simultaneously. The design and construction of this new 3-component TEM antenna was done at our institute in Cologne. The transmitter signal was generated by a single turn 50m x 50m conductor-loop. Preliminary results from these measurements are very interesting. First, it seems that conductivity structures, we see in 1D-Inversions-results of 1km Central-Loop profiles, correlate with velocity structures derived by Maercklin 2004. Furthermore, our In-Loop measurements seem to confirm the existence of a vertical near-surface conductivity-anomaly. At our southernmost profile, this anomaly is located exactly at the same position where the seismic-receivers of Haberland et al. 2003 recorded the biggest amplitude of the guided waves.

@inproceedings{koch_etal:2004, abstract = {Within the Dead-Sea-Rift-Transect-(DESERT)-project seismic, seismological, electromagnetic, gravity, magnetic, geodynamic and geological studies were done at the Dead Sea Rift/Dead Sea Transform (DST) to give answers to the question: How do shear zones work and what controls them?. Most of the small scale experiments were located at the Araba fault, which is the main fault of the DST-system between the Dead- and Red-Sea. Seismic measurements in the Araba valley done by Maercklin [2003] provided a view of the p-wave velocity distribution of the subsurface in the fault region. Haberland et al. [2003] performed a seismic experiment at the Araba fault which showed the existence of guided waves within a narrow channel of 3-12 m width. They correlated this narrow vertical layer to the damage zone of the Araba fault. In March 2004 the Institute of Geophysics and Meteorology at the University of Cologne investigated the near-surface conductivity structure of the fault area with TEM measurements. These measurements were accomplished with a new 3-component-TEM antenna attached to a three channel Nanotem receiver. Using this setup, we were able to record horizontal and vertical signals simultaneously. The design and construction of this new 3-component TEM antenna was done at our institute in Cologne. The transmitter signal was generated by a single turn 50m x 50m conductor-loop. Preliminary results from these measurements are very interesting. First, it seems that conductivity structures, we see in 1D-Inversions-results of 1km Central-Loop profiles, correlate with velocity structures derived by Maercklin [2004]. Furthermore, our In-Loop measurements seem to confirm the existence of a vertical near-surface conductivity-anomaly. At our southernmost profile, this anomaly is located exactly at the same position where the seismic-receivers of Haberland et al. [2003] recorded the biggest amplitude of the guided waves.}, added-at = {2012-09-01T13:08:21.000+0200}, address = {Hyderabad, India}, author = {Koch, O. and Helwig, S. L. and Meqbel, N. and {DESERT Group}}, biburl = {https://www.bibsonomy.org/bibtex/2ea2af19d1d7c61b99b40866bf741b34d/nilsma}, booktitle = {Proceedings of the 17th Workshop on Electromagnetic Induction in the Earth}, interhash = {c9b54fefa1e6976eb18d3a08a6bc78fd}, intrahash = {ea2af19d1d7c61b99b40866bf741b34d}, keywords = {geophysics}, organization = {IAGA}, timestamp = {2021-02-09T13:22:57.000+0100}, title = {Vertical near surface conductivity anomaly detected at the Dead Sea Transform}, url = {http://www.emindia2004.org/abstracts.htm}, year = 2004 }