Is it possible to have a VP/Vs ratio of less than 1 in near surface seismic studies (using seismic refraction and MASW methods)? If yes, What is the geological and geophysical explanation for this phenomenon?
Hi
It's not possible in reality (if VP and Vs is determined correctly). Vp/Vs should be at least 1,73 (in ideal elastic material) but not possible in real soils/rocks etc.)
Kind regards
Thanks,
in general context, considering the physical standpoint and the comprehensive framework of rock mechanical properties, as well as our profound understanding of wave dynamics, such a scenario is not possible.
The study area under scrutiny is subject to a myriad of influential factors, prominently featuring the effects of tectonic faults. Compounded by the presence of rugged rock formations characterized by irregular fractures, as well as a sedimentary reservoir containing a diverse spectrum of structural variabilities, the study locale emerges as an intricate geological terrain.
Within this intricate context, it becomes imperative to examine the repercussions of these multifaceted elements on the bulk modulus and shear modulus. These fundamental mechanical properties, intricately linked with the velocities of compressional (Vp) and shear (Vs) waves, play an instrumental role in deciphering the geological intricacies at play.
Certainly, in this case, we need to re-analyze the data again and correct them through a geotechnical study.
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