On October 30th of 2020, 14:51 (GMT+3:00), Izmir city was hit by an earthquake of M_w = 7.0 magnitude (according to USGS). A rupture of 30–40 km of a west-east normal fault, which is 10 km north to Samos Island caused significant damage, particularly in Izmir (Bornova plain). This study aims to present the preliminary field investigations, evaluation of structural damage as well as the possible geotechnical phenomenon affecting the damage that occurred. In this context, an extensive analysis of spectral characteristics of the earthquake and local site effects is presented. Field investigations reveal that there is a significant amplification of the rock acceleration along with a basin effect in the region, which results in a wider constant acceleration region. In addition, analysis of earthquake records shows a remarkable level of soil nonlinearity. Considering all these aspects, a detailed assessment of structural damage observed in Izmir Bayrakli District is presented. It is evident that, structures of poor construction details behaved as if they were affected by a near field earthquake. The structures to be constructed in alluvial zones such as Manavkuyu neighborhood should be designed considering the effects of soil amplification including basin effects and soil nonlinearity. To fulfill this aim, comparative results of 1D/2D/3D ground response analyses should be presented, for revising current earthquake codes.

2020 年 10 月 30 日 14:51 (GMT+3:00)，伊兹密尔市发生 M _w地震 = 7.0 震级（根据 USGS）。位于萨摩斯岛以北 10 公里的东西向正断层的 30-40 公里破裂造成了重大破坏，尤其是在伊兹密尔（博尔诺瓦平原）。本研究旨在介绍初步现场调查、结构损坏评估以及可能影响已发生损坏的岩土工程现象。在此背景下，对地震的频谱特征和局部场地效应进行了广泛的分析。现场调查表明，该区域岩石加速度显着放大，伴随盆地效应，导致恒加速度区域更宽。此外，对地震记录的分析表明土壤非线性程度显着。考虑到所有这些方面，介绍了对在伊兹密尔 Bayrakli 区观察到的结构损坏的详细评估。很明显，建筑细节较差的结构表现得好像受到了近场地震的影响。在 Manavkuyu​​ 社区等冲积带中建造的结构应在设计时考虑土壤放大的影响，包括盆地效应和土壤非线性。为了实现这一目标，应提供 1D/2D/3D 地面响应分析的比较结果，以修订当前的地震规范。在 Manavkuyu​​ 社区等冲积带中建造的结构应在设计时考虑土壤放大的影响，包括盆地效应和土壤非线性。为实现这一目标，应提供 1D/2D/3D 地面响应分析的比较结果，以修订当前的地震规范。在 Manavkuyu​​ 社区等冲积带中建造的结构应在设计时考虑土壤放大的影响，包括盆地效应和土壤非线性。为实现这一目标，应提供 1D/2D/3D 地面响应分析的比较结果，以修订当前的地震规范。