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  • 1
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    Am. Geophys. Union
    In:  Washington, D. C., Am. Geophys. Union, vol. 7, pp. 225, (ISBN 3-7643-7011-4)
    Publication Date: 1982
    Keywords: Plate tectonics ; Tectonics ; Turkey ; Dynamic ; Hsue ; Hsu
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  • 2
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    Publ. Off. "Nauka"
    In:  Earthquakes and Geological Hazard Prediction colloquium 06, reports vol. 6, 27th Internatl. Geological Congress, 4-14 August 1984, Moscow, Publ. Off. "Nauka", vol. 10, no. 13, pp. 1-217
    Publication Date: 1984
    Keywords: Seismicity ; Earthquake precursor: statistical anal. of seismicity ; Statistical investigations ; Grecce ; Turkey ; Italy ; Spain ; Algeria
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  • 3
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    In:  Tectonophys., New York, Scientific American, vol. 85, no. 20, pp. 1-30, pp. B11404, (ISSN: 1340-4202)
    Publication Date: 1982
    Keywords: Seismicity ; Turkey ; Statistical investigations ; Earthquake
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  • 4
    ISSN: 0016-7835
    Keywords: Key words Neotectonics ; Seismicity ; Fault-plane solution ; Stress ; Coda Q ; Earthquake ; Micro-earthquake ; Fault ; Pull-apart basin ; Overstep ; Strike slip ; North Anatolian Fault ; Turkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The course of the active North Anatolian Fault system from Lake Abant to Lake Sapanca was traced by its high micro-earthquake activity. If approaching from the east this section includes a broad south to north overstep (fault offset) of the main fault. Local seismicity has been recorded in this area by a semi-permanent network of 8 stations since 1985 within the frame of the Turkish–German Joint Project for Earthquake Research. The effect of the overstep and its complex fracture kinematics are reflected by the seismicity distribution, the variations of composite fault-plane solutions, and by the spatial coda-Q distribution. Areas of different stress orientation can be distinguished and assigned to different groups of faults. The stresses and the tectonic pattern only in part correspond to a simple model of an extensional overstep and its correlative pull-apart basin. Other types of deformation involved are characterized by normal faulting on faults parallel to the general course of the main strike-slip fault and by synthetic strike-slip faults oriented similar to Riedel shears. Shear deformation by this fault group widely distributed in an area north and east of the main fault line may play an important role in the evolution of the overstep. The development of a pull-apart basin is inhibited along the eastern half of the overstep and compatibility of both strands of the main fault (Bolu–Lake Abant and Lake Sapanca– Izmit–Marmara Sea) seems to be achieved with the aid of the fault systems mentioned. The extension of the missing part of the pull-apart basin seems to be displaced to positions remote from the Lake Abant–Lake Sapanca main fault line, i.e. to the Akyaz℩–Düzce basin tract. Highest Q-values (lowest attenuation of seismic waves) were found in the zone of highest seismicity north and west of the overstep which is the zone of strongest horizontal tension. If high coda-Q is an indicator for strong scattering of seismic waves it might be related to extensional opening of fractures.
    Type of Medium: Electronic Resource
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