Site effect is the effect on ground motion when seismic waves interact with the complex geological environment. Although this region is under a high potential of seismic risk, a hazard mitigation study is missing in terms of site effect studies at the community/geotechnical earthquake engineering level. Moreover, the recent activity of the Lesvos fault resulted in a magnitude of Mw: 6.2, which caused minor damage along the buildings constructed on alluvial ground around the town of İzmir (AFAD-ERD, 2017). As a result, significant surface ruptures were generated in Dikili-Bergama area.
The earthquakes in these areas are at moderate size (5.0 ≤ M 1000 buildings (Türkelli et al., 1990). There are earthquakes characterized by normal faulting components in many grabens such as Gediz, Büyük and Küçük Menderes, within the Western Aegean extensional system (Fig. Although the seismic risk of an earthquake is quite high depending on the active deformation along the NAFZ and EAFZ, the WAHGS also produces high potential risk of earthquakes at distinct periods.
Turkey is located on a zone of several active faults defined to the north by the North Anatolian Fault Zone (NAFZ), to the east by the East Anatolian Fault Zone (EAFZ) and to its west by the Western Anatolian Horst-Graben System (WAHGS) (Fig. The results show that soil liquefaction induced settlement and soil amplification are the most important problems in the south and the northernmost part of the study area, which is densely populated and encompasses the urbanized part of the study region. In the southernmost part of the study area where volcanic rocks are widely distributed, Vs30 values range between 360 and 908 m/s, corresponding to a C type and B type soil. Vs30 values in the north and central part are between 180 ≤ Vs ≤ 360 m/s suggesting a D type soil. The estimated Vs30 values are ≤180 m/s in the central and the northernmost part of the study area are showing an E type soil after the classification of NEHRP, where alluvial deposits are dominant. This puts the region under an important earthquake risk. It has been proposed that the probability of an earthquake with a magnitude of M w: 6 occurring within 10 years is 64%, when considering the Gutenberg-Richter model.
To solve the soil static and dynamic problems, shear-wave velocities have been used in a joint interpretation process Multichannel Analysis of Surface Waves (MASW) and Refraction Microtremor (ReMi) analyses were conducted on 121 sites with 300 × 300 m grid size in an area of 60 km 2. The site effect and soil engineering problems for estimating hazard parameters at the soil surface need to be carefully analyzed for seismic site classification and geo-engineering problems like soil liquefaction, soil settlement, soil bearing capacity and soil amplification. A proper estimate of the earthquake-related hazard for the area is the main objective of this study. soft sediments to relative to rock area). In September 1939 the Dikili (Kabakum) earthquake with a magnitude of Mw: 6.6 occurred and after this phenomenon, residents moved from the west of Dikili to the east (i.d.
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The study area is located in the northern part of Izmir, Western Turkey, prone to an active tectonic extensional regime and includes typical features of sedimentary basins, horst-grabens surrounded by a series of normal and strike-slip faults.
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