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Geomechanics and Engineering Volume 30, Number 3, August10 2022 , pages 233-246 DOI: https://doi.org/10.12989/gae.2022.30.3.233 |
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PGA estimates for deep soils atop deep geological sediments -An example of Osijek, Croatia |
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Borko Đ. Bulajić, Marijana Hadzima-Nyarko and Gordana Pavić
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| Abstract | ||
| In this study, the city of Osijek is used as a case study area for low to medium seismicity regions with deep soil over deep geological deposits to determine horizontal PGA values. For this reason, we propose new regional attenuation equations for PGA that can simultaneously capture the effects of deep geology and local soil conditions. A micro-zoning map for the city of Osijek is constructed using the derived empirical scaling equations and compared to all prior seismic hazard estimates for the same area. The findings suggest that the deep soil atop deep geological sediments results in PGA values that are only 6 percent larger than those reported at rock soil sites atop geological rocks. Given the rarity of ground motion records for deep soils atop deep geological layers around the world, we believe this case study is a start toward defining more reliable PGA estimates for similar areas. | ||
| Key Words | ||
| deep geological sediments; deep soil; horizontal; microzoning; PGA | ||
| Address | ||
| Borko Đ. Bulajić: Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000 Novi Sad, Serbia Marijana Hadzima-Nyarko and Gordana Pavić: Faculty of Civil Engineering and Architecture Osijek, Josip Juraj Strossmayer University of Osijek, Vladimira Preloga 3, 31000 Osijek, Croatia | ||