How to introduce Ambient vibration techniques to newcomers?

Discuss here all technical and scientific questions about the processing of ambient vibrations for site characterization (H/V, Array methods,...)
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UPCzpc
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Joined: Tue Aug 25, 2020 12:01 pm

How to introduce Ambient vibration techniques to newcomers?

Post by UPCzpc »

I am interviewing for a job, mainly to provide technical services for seismic instruments, and I need to make a related introduction to HVSR and arrays.
What materials should I read?
What knowledge points and precautions should I provide to customers?
admin
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Re: How to introduce Ambient vibration techniques to newcomers?

Post by admin »

Hi,

I would start with a relatively recent paper written in the course of InterPACIFIC project.
https://link.springer.com/article/10.10 ... 017-0206-7
luigiV
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Joined: Fri Jul 17, 2020 9:28 am

Re: How to introduce Ambient vibration techniques to newcomers?

Post by luigiV »

Hi Marc,
I would like to know your opinion regarding this sentence contained in the paper you cited (https://link.springer.com/article/10.10 ... 017-0206-7, pag.44 of the paper) and related to the theme of joint inversion DC- HV: "Resonance frequency and / or H / V curve When available and when the experimental dispersion curve gives information down to the H / V frequency peak, this frequency may be jointly inverted with the dispersion curves (see Appendix 7). As well, part of or the whole H / V curve can be inverted, which requires the use of a dedicated solver."
In your 2013 paper (Ground structure imaging by inversions of Rayleigh wave ellipticity: sensitivity analysis and application to European strong-motion sites) you concluded that: ".... We showed that a frequency gap between both information may be allowed .. .... For practical uses and without any prior information on the complexity of the ground structure, we thus recommend that a factor of 2 should in any case not be exceeded to stay on the safe side ... "
Do you confirm this position or do you agree with Foti et al. on the need for there to be no frequency gap between the information that can be usefully used in the DC-HV joint inversion?

Regards
Luigi
Last edited by luigiV on Mon May 03, 2021 1:33 pm, edited 1 time in total.
admin
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Re: How to introduce Ambient vibration techniques to newcomers?

Post by admin »

Foti et al. on this aspect stays on the safest side. Hobiger et al. concluded that a safe option is a factor 2. For simple structures (homogeneous 1D sediments on a hard rock), even a gap of factor 10 can work. But the more data you have, the better you approach the real complex structures.
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