Aktuelles

Neuigkeiten

Die neue analoge Multistations-Geophonkette zur Durchführung von S-Wellentomographie ist auf dem Markt

Alternativ zum digitalen MBAS System bieten wir nun auch eine analoge Version (MBAS-A) an.

 

MBAS-A | Analog Multistation Borehole Aqcuisition System

Die neusten Entwicklungen der Bohrlochseismik für 2017
(P-Wellentomographie bis 1000 m Tiefe)

Dieses Jahr schon werden wir unsere neue P-Wellen Bohrloch Quelle und die neue Hydrophonkette mit digitaler Technologie auf den Markt bringen. Weitere Informationen entnehmen Sie bitte folgenden Produktblättern. 

 

SBS1000 Magnum | P-Wave Sparker Borehole Source

BHC1000 | Digital Hydrophone String

79th EAGE Conference & Exhibition 12-15 Juni in Paris

Die 78th EAGE Conference & Exhibition 2017 ist die größte Veranstaltung in den Geowissenschaften weltweit. Diese Konferenz bietet mehr als 1.000 technische Präsentationen und Postern, sowie eine Fachausstellung mit den neuesten Entwicklungen in Geophysik, Geologie und Reservoir / Petroleum Engineering.

Wir laden Sie herzlich ein, unseren Stand #781 zu besuchen, wo wir Ihnen die neusten Technolgien in der Bohrlochseismik vorstellen werden.

 

EAGE2017

DGG - 77. Jahrestagung 27-30 März in Potsdam

Die Deutsche Geophysikalische Gesellschaft (DGG) veranstaltet jährlich eine wissenschaftliche Tagung. Diese Tagung ist ein Forum für die Darstellung von Arbeiten aus allen Bereichen der Geophysik. Schwerpunkte aktueller Forschung werden herausgestellt. Plenarvorträge führen in aktuelle Forschungsbereiche ein.

Geotomographie stellt am Stand die neusten Geräte in der Bohrlochseismik vor. Wir freuen uns auf Ihren Besuch.

 

DGG logo

SAGEEP Konferenz 19-23 März in Denver

Die SAGEEP ist eine der führenden internationalen Konferenzen, wenn es um die Anwendung oberflächennaher Geophysik geht.

Sie finden uns als Aussteller am Stand #1 

Thomas Fechner wird folgenden Vortrag halten:

Structure delineation using S-wave reflection seismic and borehole tomography to support ground water modelling


sageep logo

Weihnachtsspende für "Ärzte ohne Grenzen"

November 2016

Ärzte ohne Grenzen trägt dazu bei, medizinische Hilfe für Menschen in Not zu leisten und ihr Leid zu lindern, wenn durch Naturkatastrophen oder durch Menschen verursachte Krisen die lokalen Gesundheitsstrukturen nicht mehr greifen. Ärzte ohne Grenzen ist eine private internationale Organisation. Die meisten Mitarbeiterinnen und Mitarbeiter sind Ärzte und Pflegekräfte, in ihren Projekten sind aber auch Vertreter zahlreicher anderer Berufe tätig. Sie helfen Menschen ungeachtet ihrer ethnischen Herkunft und religiösen oder politischen Überzeugung.


300x250 2016 Spender de


Geotomographie erhält Forschungssiegel "Innovativ Durch Forschung" 2016/2017

September 2016

Geotomographie GmbH erhält Forschungssiegel "Innovativ durch Forschung", ausgezeichnet durch den deutschen Stifterverband. Der Stifterverband ehrt Forschungsorganisationen für ihre besondere Verantwortung, die sie für Staat und Gesellschaft übernehmen. Der Stifterverband konzentriert sich vor allem auf die Bereiche Bildung, Wissenschaft und Innovation.


Forschung und Entwicklung 2016 print

 


Konferenzen und Seminare

2017

12. - 15. Juni

79th EAGE Conference & Exhibition 2017
Paris Expo Porte de Versailles, Paris (France)
https://events.eage.org/en/2017/79th-eage-conference-and-exhibition-2017

19. - 23. März

SAGEEP (Symposium on the Application of Geophysics to Engineering and Environmental Problems)
Denver Marriott Denver City Center, Denver (USA)
http://www.eegs.org/sageep-2017

27. - 30. März

DGG Jahrestagung
University Potsdam, Potsdam (Deutschland)
http://dgg2017.dgg-tagung.de/start/

3. - 7. September

Near Surface Geoscience (23rd European Meeting of Environmental and Engineering Geophysics)
Clarion Hotel & Congress Malmö Live, Malmö (Schweden)
https://www.eage.org/event/?eventid=1516

9. - 12. Oktober

International Conference of Engineering Geophysics (ICEG)
Conference Auditorium of the Crescent Building, Al Ain (UAE)
http://seg.org/Events/ICEG2017

2016

19. - 20. Januar

10. Kolloquium „Bauen in Boden und Fels“
Technische Akademie Esslingen, Ostfildern (Deutschland)
http://www.tae.de/kolloquien-symposien/bauwesen-energieeffizienz-und-umwelt/10-kolloquium-bauen-in-boden-und-fels/

14. - 17. März

DGG Jahrestagung
Universität Münster, Münster (Deutschland)
http://www.dgg-2016.de/

30. Mai - 2. Juni

78th EAGE Conference & Exhibition 2016
Reed Messe, Wien (Österreich)
http://www.eage.org/event/index.php?eventid=1391

24. - 27. Juni

7th International Conference on Environmental and Engineering Geophysics
Institute of Geology and Geophysics - Chines Academy of Science, Beijing (China)
http://www.temcas.com/?p=1285

5. - 9. September

ISC’15 (5th International conference on geotechnical and geophysical site characterization)
Jupiters Hotel, Gold Coast, Queensland (Australien)
http://www.isc5.com.au/

5. - 8. Oktober

Geofluid
Piacenzaexpo, Piacenza (Italien)
http://www.geofluid.it/

16. - 21. October

SEG (Society of Exploration Geophysicists) - Annual Meeting
Kay Bailey Hutchison Convention Center, Dallas (USA)
http://seg.org/Events/Annual-Meeting/

 


Veröffentlichungen

S-Wave Borehole Tomography – A Tool for Geotechnical Site Characterization

2016: T. Fechner, J. v. Ketelhodt and Z. Lin

Content:
Geophysical methods are able to fill the gap between boreholes and to provide a measure of the spatial continuity of structures. Borehole seismic tomography promises the highest resolution when applied at a local scale of a few tens of meters. Currently, almost exclusively P-wave tomography is employed in geotechnical oriented tomographic surveys. However, from the geotechnical perspective, the benefit of P-wave tomography is rather limited. It is the S-wave structure of the ground which is crucial to derive geotechnical relevant parameters, such as shear strength or other elastic moduli. Up to now, only little effort has been made to develop the borehole S-wave crosshole tomographic method. S-wave tomography has some clear advantages compared to conventional P-wave tomography, such as a better spatial resolution and a higher sensitivity to material changes. Furthermore, S-waves are only slightly influenced by the ground water table and S-waves passing this zone are not much affected by ray bending compared to P-waves. Within this paper we present first results of a newly developed S-wave tomography system and field results from different test sites.

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Concerted cavity exploration under a congested industrial plant

2016: T. Fechner, H. Kolb, A. Patzelt

Content:
Subsidence of pavement and infrastructure of a gas plant located on an island in the Middle East were observed. Several parts of the industrial plant were built on highly weathered sandstone and limestone or backfilled areas which are pretty inhomogeneous. The results are loosening zones and cavities in the subsurface. A combination of ground-penetrating radar (GPR), electrical resistivity tomography (ERT) as well as surface wave seismic (MASW) were used to benefit from their individual resolution, depth penetration and advantages to investigate the underground.

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Reliability Maps for Seismic Tomography

2015: T. Fechner, S. I. Ehosioke, S. Mackens, L. Karl and D. Tweeton

Content:
Seismic borehole tomography is a standard method and is routinely used for the detection of karstic phenomena and the delineation of geological structures. Seismic tomography is believed to be the seismic method promising highest accuracy and reliability. However, data quality has a significant influence on the accuracy of a travel time pick. Tomographic inversion results are presented where the signal-to-noise ratio of the first arrival times is considered as a data quality measure during tomographic inversion. This new data quality weighting scheme is supposed to provide more reliable inversion results. Information about the reliability of the tomogram provided along with the seismic tomogram may support the geophysicist interpretation.

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A New Approach to Determine the Diameter of a Jet Grouted Column Using Seismic Methods

2015: S. Mackens, T. Fechner, N. I. C. Rios, D. Tweeton, J. C. Galindo Guerreros and E. Niederleithinger

Content:
Jet grouting is a geotechnical method of ground improvement to increase shear strength and stiffness of soils. Typical geometries of grouted soil are panels or columns. The final diameter of grouted columns can be predicted only vaguely and an in situ control often impossible, especially under complex site conditions. Therefore, borehole seismic measurements (crosshole, downhole and tomography) were tested as a quality control to verify the extent of the column and to monitor the influence of the jet grout injection on the soil over time. The acquired seismic data show clear traveltime differences which allow the determination of the specific column depth and diameter.

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Interpretation of Seismic Tomography Results Using Data Quality and Residual Error Maps

2015: S. Mackens, L. Karl, T. Fechner and D. Tweeton

Content:
In seismic borehole tomography, the interpretation of the results is commonly limited to the comparison of the velocity map, the ray coverage, and the global root-mean-square RMS residual. However, the quality of the seismic data has a significant influence on the accuracy of the arrival time picking, but is generally not considered in the inversion. An inversion procedure is presented taking into account the data quality based on the signal-to-noise ratio which is used to weight the traveltime residuals in each iteration step. This implementation also calculates the spatial distribution of the data quality and the distribution of the residual remaining at the end of the inversion, which are used to support the evaluation of a velocity map.

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Geotechnical Characterization of a River Dyke by Surface Waves

2011: L. Karl, T. Fechner, M. Schevenels, S. Francois and G. Degrande

Content:
Effective and reliable methods to survey and monitor the structure of earth-fill dams recently became pressing in terms of the increasing number of flood events in central Europe. Among geophysical techniques, dam imaging using electrical resistivity methods is applied in most cases. Ground-penetrating radar is occasionally used to search for subsurface facilities. This paper focuses on seismic methods, in particular the multichannel analysis of the surface waves (MASW) method to determine dynamic soil properties and identify dyke and dam structures. In this paper the influences of the dyke’s topography on the test results are studied by means of a numerical analysis. Typical cross-sections are modelled using 2.5D finite and boundary elements. The results of models taking the topography into account are compared with models neglecting the topography. The differences are evaluated on the level of the dispersion curves and for one cross-section on the level of the S-wave velocity. They were found to be insignificant for dykes with a width-to-height ratio larger than four. Test results of a testing campaign obtained at two test sites on dykes are selected and compared to the results of borehole logs and cone penetration tests. A remarkable relation between the S-wave velocity and the consistency of the clay sealing was found at one site and valuable information on the composition of the dyke body and base could be obtained.

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