Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Energy histograms for the characterization of deep reflection seismic profiles (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 105 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We modified Dohr's method and were able to establish trends of crustal reflectivity distribution. Four main types of crustal reflectivity-depth histograms could be distinguished. Dohr's method was based on line drawings from which the total length of reflections was calculated for time-distance frames along the profile. In this paper we present a new method to derive such histograms automatically from the final stack tapes. This allows an objective comparison of deep reflection seismograms from different crustal units and from different research groups. It is shown that our energy histograms are consistent with earlier manually produced histograms and that the previous results can be reproduced. First applications to DEKORP and KTB data in Germany are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb03442.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    CRUSTAL REFLECTIVITY PATTERN AND ITS RELATION TO GEOLOGICAL PROVINCES (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 36 (1988), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The statistical treatment of deep seismic reflections from several different geological units has resulted in different reflectivity histograms. Reflectivity in old and cold shields differs significantly from that in younger, warmer areas. In the shields reflectivity is generally poor and concentrated in the upper crust whilst Caledonian and Variscan areas show strong reflecting lamellae in their lower crust. Also the length of the reflecting elements varies with age and heat flow. The lower crust in young areas is a zone of a strong viscosity minimum as derived from model studies with a temperature dependent rheology. The subhorizontal reflecting lamellae in the lower crust are considered to have been created in a large-scale high-temperature, low-viscosity ordering process whose remnants are still preserved today. Local-scale differences of reflectivity histograms define certain subprovinces which can be distinguished by their specific patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1988.tb02163.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Continental collisions and seismic signature (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 105 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Reflection seismics; in compressional belts has revealed the structure of crustal shortening and thickening processes, showing complex patterns of indentation and interfingering of colliding crusts and subcrustal lithospheres. Generally in the upper crust large zones of detachments develop, often showing duplexes and ‘crocodile’ structures. The lower crust from zones of active collision (e.g. Alps, Pyrenees) is characterized by strongly dipping reflections. The base of the crust with the Moho must be continuously equilibrating after orogenic collapse as areas of former continental collision exhibit flat Mohos and subhorizontal reflections. The depth to the Moho increases during collision and decreases after the onset of post-orogenic extension, until finally the crustal root disappears completely together with the erosion of the mountains.Processes, active during continental collisions and orogenic collapse, create distinct structures which are imaged by reflection seismic profiling. Examples are shown and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb03440.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Seismic evidence of increased tectonothermal activity near the Oberpfalz deep continental drilling location (SE Germany) (1990)
    Springer
    International journal of earth sciences 79 (1990), S. 649-658 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract The success of ultradeep drilling projects, as e.g. within the German Continental Deep Drilling Programme (Kontinentales Tiefbohrprogramm, KTB) in the Oberpfalz strongly depends on the thermal and geological-tectonic environment of the well. In the present paper we apply the correlation of elevated temperatures and seismic reflectivity of the lower continental crust to the deep seismic network of the Oberpfalz. The results together with the correlation to other geoscientific data indicate increased temperatures in the area of the KTB location. These temperatures are most probably related to influences of the Eger graben and possibly are not yet measured at the surface using heat flow determinations.
    Abstract: Résumé Le succès de sondages très profonds, comme celui qui est envisagé dans le Haut Palatinat dans le cadre du programme allemand de sondages profonds continentaux (Kontinental Tiefbohrprogramm: KTB) est étroitement lié à l'environnement thermique et tectono-géologique des forages. Dans cette note, la corrélation entre les hautes températures et la réflectivité sismique est appliquée au réseau sismique fourni par les profils DEKORP 4 et KTB dans le Haut Palatinat. Les résultats obtenus, joints à d'autres données géologiques, laissent prévoir dans la région du KTB des températures plus élevées que celles qui étaient envisagées jusqu'ici. Ces températures élevées sont probablement en relation avec l'extrémité ouest du graben d'Eger et n'ont pas encore été repérées en surface par les mesures du flux de chaleur.
    Notes: Zusammenfassung Der Erfolg ultratiefer Bohrungen, wie etwa in der Oberpfalz im Rahmen des deutschen Kontinentalen Tiefbohrprogramms (KTB), hängt sehr stark vom thermischen und geologisch-tektonischen Umfeld der Bohrung ab. In der vorliegenden Arbeit wird die Korrelation von erhöhten Temperaturen und guter Reflektivität der kontinentalen Unterkruste angewandt auf das seismische Netz der DEKORP 4 und KTB Linien in der Oberpfalz. Aufgrund der Ergebnisse und anderer geowissenschaftlicher Resultate sind höhere Temperaturen als vorher berechnet im Bereich der Tiefbohrung zu erwarten. Diese dürften im Zusammenhang mit dem westlichen Ende des Eger Grabens stehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01879207
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...