Modeling stratigraphic structure of Menemen Plain-Izmir/Turkey by microgravity, passive seismic methods and examining its behavior under earthquake effect


JOURNAL OF APPLIED GEOPHYSICS, vol.182, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 182
  • Publication Date: 2020
  • Doi Number: 10.1016/j.jappgeo.2020.104175
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Compendex, Geobase, INSPEC
  • Keywords: Microtremor, Miaogravity, Equivalent linear seismic site response analyses, Izmir, Bouguer gravity anomaly, VERTICAL SPECTRAL RATIO, CRUSTAL STRUCTURE, ACTIVE TECTONICS, WESTERN ANATOLIA, IZMIR, TURKEY, MICROTREMOR, TOMOGRAPHY, BASIN, MICROZONATION
  • Dokuz Eylül University Affiliated: Yes


Considering the processes that are effective in the formation of the geometry of the sedimentary basin, using stratigraphic information obtained from a small number of boreholes may be insufficient for the modeling and interpretation of a very large area for construction purposes. Moreover, if the behavior of this large area under the effect of earthquake needs to be modeled, the number of boreholes and the geometry of their distribution across the area are very important. Is it always possible to obtain data by a sufficient number of boreholes with sufficient depths in all kinds of regions? A stratigraphic sequence can be defined at the end of the analysis of microtremor data and joint evaluation of the findings and microgravity data set obtained together. Defining the related stratigraphic structure is the input parameter for modeling the soil behavior based on an existing earthquake record. This study aims to model the behavior of the stratigraphy of the Menemen Plain and its surroundings under a possible earthquake force. Due to the active tectonic regime of Western Anatolia, there are many records about the destructive earthquakes in Menemen Plain, Izmir and its surroundings in both historical and instrumental records. From this perspective, a basic data set was created for the study area using microgravity and microtremor methods. S-Wave Velocity depth sections were obtained from the forward and inverse solutions of Horizontal/Vertical Spectral Ratio (HVSR) curves obtained from microtremor method evaluations. Density values were calculated from these S-wave velocity data obtained with the help of empirical equations. For the 4 profiles determined in the study area, the profile sections were drawn using Bouguer map and gravity models of these profiles were prepared. The gravity models obtained were interpreted by considering the 1D S-Wave Velocity sections and the geology of the region in combination, and the stratigraphic features of the Menemen Plain were determined in 2D. In this study, the results obtained using microtremor and microgravity methods and the efficiency of the models obtained from these results were investigated across Menemen Plain in the Western Anatolia Region based on the limited borehole data available. Finally, possible soil responses during an earthquake scenario were calculated based on the earthquake in Akhisar/Manisa/Turkey on 18.02.2020 at 16:09:22 (GMT), Mw = 5.2, 39.1060(0) N-27.8747 degrees E, for the midpoints of the 4 profiles that were modeled. (C) 2020 Elsevier B.V. All rights reserved.