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  • Other Sources  (2)
  • 2005-2009  (2)
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  • 1
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    Submarine fault scarps in the Sea of Marmara pull-apart (North Anatolian Fault): Implications for seismic hazard in Istanbul (2005)
    In:  Geochem. Geophys. Geosyst., Amsterdam, Elsevier Scientific Publishing Company, vol. 6, no. 6, pp. 1-29, pp. Q06009
    Details
    Publication Date: 2005
    Description: Earthquake scarps associated with recent historical events have been found on the floor of the Sea of Marmara, along the North Anatolian Fault (NAF). The MAuto-Regressive Moving Average-processRASCARPS cruise using an unmanned submersible (ROV) provides direct observations to study the fine-scale morphology and geology of those scarps, their distribution, and geometry. The observations are consistent with the diversity of fault mechanisms and the fault segmentation within the north Marmara extensional step-over, between the strike-slip Ganos and Izmit faults. Smaller strike-slip segments and pull-apart basins alternate within the main step-over, commonly combining strike-slip and extension. Rapid sedimentation rates of 1-3 mm/yr appear to compete with normal faulting components of up to 6 mm/yr at the pull-apart margins. In spite of the fast sedimentation rates the submarine scarps are preserved and accumulate relief. Sets of youthful earthquake scarps extend offshore from the Ganos and Izmit faults on land into the Sea of Marmara. Our observations suggest that they correspond to the submarine ruptures of the 1999 Izmit (Mw 7.4) and the 1912 Ganos (Ms 7.4) earthquakes. While the 1999 rupture ends at the immediate eastern entrance of the extensional Cinarcik Basin, the 1912 rupture appears to have crossed the Ganos restraining bend into the Sea of Marmara floor for 60 km with a right-lateral slip of 5 m, ending in the Central Basin step-over. From the Gulf of Saros to Marmara the total 1912 rupture length is probably about 140 km, not 50 km as previously thought. The direct observations of submarine scarps in Marmara are critical to defining barriers that have arrested past earthquakes as well as defining a possible segmentation of the contemporary state of loading. Incorporating the submarine scarp evidence modifies substantially our understanding of the current state of loading along the NAF next to Istanbul. Coulomb stress modeling shows a zone of maximum loading with at least 4-5 m of slip deficit encompassing the strike-slip segment 70 km long between the Cinarcik and Central Basins. That segment alone would be capable of generating a large-magnitude earthquake (Mw 7.2). Other segments in Marmara appear less loaded. FROTH
    Keywords: Earthquake hazard ; Turkey ; Fault zone ; NAF ; G3 ; G-cubed ; AGU ; Ucarkus ; Lepinay ; Cagatay ; Cakir ; Structural geology ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; Oezalaybey ; Ozalaybey ; Lefevre ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; morphology ; submersible ; 8110 ; Tectonophysics: ; Continental ; tectonics: ; general ; 1766 ; 1894 ; 1912 ; 1999 ; Earthquake
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Online Tools for Astronomy and Cosmochemistry (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Over the past year, the Webnucleo Group at Clemson University has been developing a web site with a number of interactive online tools for astronomy and cosmochemistry applications. The site uses SHP (Simplified Hypertext Preprocessor), which, because of its flexibility, allows us to embed almost any computer language into our web pages. For a description of SHP, please see http://www.joeldenny.com/ At our web site, an internet user may mine large and complex data sets, such as our stellar evolution models, and make graphs or tables of the results. The user may also run some of our detailed nuclear physics and astrophysics codes, such as our nuclear statistical equilibrium code, which is written in fortran and C. Again, the user may make graphs and tables and download the results.
    Keywords: Documentation and Information Science
    Type: Lunar and Planetary Science XXXVI, Part 13; LPI-Contrib-1234-Pt-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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