Seismic surface waves to characterize complex systems
Nickname
SSWCCS
Format
SEGY
Type
PASSCAL
Start year
2009
End Year
2010
Description
Shallow buried heterogeneities act as diffractors to an incoming surface wave. Experimental and numerical analyses are conducted to analyze the problem and to propose a methodology for mapping shallowly embedded objects. A layered system having a high impedance contrast at the base containing shallowly buried drums is tested experimentally. Stacked maps of frequency, velocity and lateral position show the presence of the drums. A hypothesis is posed that the most significant impact of the shallow obstacle on the incident wavefield is diffraction of Rayleigh wave energy. Synthetic seismograms generated through numerical modeling support the hypothesis. The interpretation of the data is complicated by factors such as acquisition footprint and frequency content. These factors remain to be investigated.
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