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      https://www.ias.ac.in/article/fulltext/jess/123/01/0073-0089

    • Keywords

       

      Earthquakes; structural damage; $V_{S}$30; soil liquefaction; soil effect.

    • Abstract

       

      Yalova City (Turkey) is in a tectonically active location that is particularly affected by the northern branch of the North Anatolian Fault Zone. Magnitudes 7.4 and 7.2 earthquakes in 1999 caused great destruction in Yalova. The heavy damage to buildings and other civil engineering structures was mainly due to liquefaction-induced settlement and site effects such as resonance and amplification. In the first phase of this study, the soil liquefaction potential index (PL) and the induced soil settlement were estimated. In the second phase, the effects on sites in Yalova soil were investigated using microtremor and earthquake data. The fundamental periods and amplification in soft soil were compared with microtremor data and strong ground motion records obtained by a local array of eight accelerograph stations deployed in Yalova. Thirty-seven ‘single site’ ambient noise measurements were taken in a dense grid of points covering the centre of the city. A comparison between fundamental periods obtained from strong ground motion records and from microtremor measurements showed similarities, in the 0.1–5 Hz range. Finally, soil liquefaction and amplification (or resonance) were divided into regions according to the extent of damage and the geotechnical/geophysical results.

    • Author Affiliations

       

      Ferhat Ozcep1 Savas Karabulut1 Oguz Özel1 Tazegul Ozcep2 Nazire İmre3 Halil Zarif1

      1. Department of Geophysical Engineering, Istanbul University, Istanbul, 34320, Turkey.
      2. Sirinevler Primary School, Sirinevler Ministry of National Education, Istanbul, Turkey.
      3. Emek Geophysical and Geotechnical Company, Büyük¸cekmece, Istanbul, Turkey.
    • Dates

       
  • Journal of Earth System Science | News

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