For performing the real scenario ground seismic simulation, we require certain input parameters like Shear wave variation with depth or Vs (30), density of the soil layers etc. Following instrument are commonly used in our institutions to obtain these values like Vs.
Ground Penetrating Radar (GPR)
MASW (Multichannel Analysis of Surface wave)
Tromino
I just wanted to know that the data obtained from which instrument is more reliable. I have also seen some papers in which scientist used Tromino for obtaining Building response. I just want expert advice regarding its reliability to obtain building response.
Hi Neeraj..Nice question. Use of the instrument is totally dependent on your objective. Guralp CMG 40T is another instrument for recording microtremor and conducting a site response analysis. This instrument is simple to use, just plug in go. It helps in estimating the fundamental frequency of the site and in the presence of borehole data, makes it possible to estimate the thickness of the sediment cover residing on the bedrock. A sharp peak of fundamental frequency implies significant impedance contrast which can cause site amplification due to entrapment and amplification of seismic waves. Details can be found in literature available online.
Hi, Neeraj. Frequently, the best instrument depends on your objective. For example, if you want to study the properties of the shallow subsurface, specifically about water or vadose zone, it is recommended to use GPR. This idea is valid for the other suggestions that you gave. The case is: what instrument "responds" better to your question?
For precise determination of shear wave velocity (Vs) with the depth, use crosshole or downhole tests. Regards.
Please keep in mind that you will not be able to derive seismic velocities from GPR measurements. If you are however interested in imaging the structure of the soil and topmost layers, then GPR will offer you highest imaging resolution.
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