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  • 1
    Electronic Resource
    Electronic Resource
    A seismic refraction study of the western Tuz Gölü basin, central Turkey (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 106 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In 1970, the Turkish Petroleum Company carried out a seismic refraction experiment in the Tuz Gölü (Salt Lake) basin of central Turkey. We present our interpretation, using time-term analysis and ray tracing, of data from one of the two lines shot. This confirms the presence of a thick sequence of sedimentary layers varying from about 3 km below the southwestern end of the profile to about 10 km at two points along the line. A P-wave velocity of 4.0–4.2 km s−1 found beneath the low-velocity surface layer indicates that the principal sedimentary layer consists of evaporites. The lowermost layer of the model has a P-wave velocity of 6.15 km s−1 which is consistent with the sedimentary layers being underlain either by Cretaceous metamorphic basement or by lavas of andesitic type.The extensive coverage provided by this data set has enabled the construction of a detailed 2-D model which shows the complex topography of the subsurface layers. We identify two major faults and one minor fault affecting both the basement and overlying layers. The character of these features and the associated layer displacements leads us to speculate that these may be growth faults associated with the Aksaray-Şereflikoçhisar and Karapinar-Cihanbeyli-Haymana hinge structures which have controlled the development of the Tuz Gölü basin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb04614.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Gas and seismicity within the Istanbul seismic gap (2018)
    Nature Research
    In:  Scientific Reports, 8 (Article number 6819).
    Details
    Publication Date: 2021-02-08
    Description: Understanding micro-seismicity is a critical question for earthquake hazard assessment. Since the devastating earthquakes of Izmit and Duzce in 1999, the seismicity along the submerged section of North Anatolian Fault within the Sea of Marmara (comprising the “Istanbul seismic gap”) has been extensively studied in order to infer its mechanical behaviour (creeping vs locked). So far, the seismicity has been interpreted only in terms of being tectonic-driven, although the Main Marmara Fault (MMF) is known to strike across multiple hydrocarbon gas sources. Here, we show that a large number of the aftershocks that followed the M 5.1 earthquake of July, 25th 2011 in the western Sea of Marmara, occurred within a zone of gas overpressuring in the 1.5–5 km depth range, from where pressurized gas is expected to migrate along the MMF, up to the surface sediment layers. Hence, gas-related processes should also be considered for a complete interpretation of the micro-seismicity (~M 〈 3) within the Istanbul offshore domain.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/s41598-018-23536-7
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Gas and seismicity within the Istanbul seismic gap (2019)
    Details
    Publication Date: 2021-06-25
    Description: Understanding micro-seismicity is a critical question for earthquake hazard assessment. Since the devastating earthquakes of Izmit and Duzce in 1999, the seismicity along the submerged section of North Anatolian Fault within the Sea of Marmara (comprising the “Istanbul seismic gap”) has been extensively studied in order to infer its mechanical behaviour (creeping vs locked). So far, the seismicity has been interpreted only in terms of being tectonic-driven, although the Main Marmara Fault (MMF) is known to strike across multiple hydrocarbon gas sources. Here, we show that a large number of the aftershocks that followed the M 5.1 earthquake of July, 25th 2011 in the western Sea of Marmara, occurred within a zone of gas overpressuring in the 1.5–5 km depth range, from where pressurized gas is expected to migrate along the MMF, up to the surface sediment layers. Hence, gas-related processes should also be considered for a complete interpretation of the micro-seismicity (~M 〈 3) within the Istanbul offshore domain.
    Description: Published
    Description: id 6819
    Description: 3A. Geofisica marina e osservazioni multiparametriche a fondo mare
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 4
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    Tomographic Imaging of Lg and Sn Propagation in the Middle East (2001)
    In:  Pure and Applied Geophysics
    Details
    Publication Date: 2020-02-12
    Description:  — Observations based on relatively limited data recorded by sparsely distributed stations have indicated that regional seismic phase propagation (Lg and Sn) is very complex in the Middle East. Accurate characterization of regional seismic wave propagation in this region necessitates the use of a large number of seismic stations. We have compiled a large data set of regional and local seismograms recorded in the Middle East. This data set comprises approximately four years of data from national short-period networks in Turkey and Syria, data from temporary broadband arrays in Saudi Arabia and the Caspian Sea region, and data from GSN, MEDNET, and GEOFON stations in the Middle East. We have used this data set to decipher the character and pattern of regional seismic wave propagation. We have mapped zones of blockage as well as inefficient and efficient propagation for Lg, Pg, and Sn throughout the Middle East. Two tomographic techniques have been developed in order to objectively determine regions of lithospheric attenuation in the Middle East.¶We observe evidence of major increase in Lg attenuation, relative to Pg, across the Bitlis suture and the Zagros fold and thrust belt, corresponding to the boundary between the Arabian and Eurasian plates. We also observe a zone of inefficient Sn propagation along the Dead Sea fault system which coincides with low Pn velocities along most of the Dead Sea fault system and with previous observations of poor Sn propagation in western Jordan. Our observations indicate that in the northern portion of the Arabian plate (south of the Bitlis suture) there is also a zone of inefficient Sn propagation that would not have been predicted from prior measurements of relatively low Pn velocities. Mapped high attenuation of Sn correlates well with regions of Cenozoic and Holocene basaltic volcanism. These regions of uppermost mantle shear-wave attenuation most probably have anomously hot and possibly thin lithosphere.
    Language: English
    Type: info:eu-repo/semantics/article
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    GFZ OAI
  • 5
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    Gas and seismicity within the Istanbul seismic gap (2018)
    In:  Scientific Reports
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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