Investigation of near-surface structures using multi-channel analysis of surface waves

Subject : Seismic application
Method : MASW
Instruments : WZG24B Engineerring Seismograph
Equipments : 4,5Hz Vertical Geophone and  Take out cable 5m spaces
Location :  Çanakkale – TURKEY , Onsekiz Mart University of Campus
Date : 18.04.2012

In this study, dispersive characteristics of Rayleigh type surface waves were utilized for the investigation of shallow subsurface structures. The surface waves have the strongest energy among all other types of seismic waves ensuring the highest signal-to-noise ratios. Reliabilities of the results of the multi-channel analysis of surface waves(MASW) depend on seismic source, offsets, and geophone’s frequency and intervals during the data acquisition. The success of the structure and medium prediction of the surface wave analysis as well as selection of the appropriate parameters were documented in the field studies at the antique city of Magnesia. In this study, a 12-channel WZG24 seismograph, one types of vertical component P geophones with frequencies of 4.5 Hz and
8-kg sledgehammer as energy source were used. In order to test the effect of the variations of geophone frequencies, multi-channel data records were acquired with different offsets keeping the geophone intervals fixed. Onedimensional (1D) surface wave analysis and the inversion depending on non-linear least- square algorithm were used to evaluate the data.




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