What is it about?
The study presents a cross-section of results of, basically, a geomechanical (geohydrological) experimental investigation involving use of ultrasonic frequencies to probe laboratory scale fractured sediment analogues under variable stress conditions to acquire data for further evaluation to advantage/purpose. Aim was to improve understanding of field scale geotechnical investigative applications, especially involving seismic and aseismic stimulation against a regional stress variation condition. A geotechnical analyses method for earthquake type ground motions is developed using standard, but modified, method or procedures by explaining pertinent theory and citing and consulting suitable references/reference materials, alongside a critique of inadequacies of previous (statistical methods) , in favor of model based site specific experiments.
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Why is it important?
The importance of the article lies with the fact that , given above said discussion, (i) not only it draws attention towards the inadequacy of the empirical principles and procedures behind the existing methods of earthquake and ground motion analyses (statistical distributions and its weighted regularizations) on factual and logical grounds, (ii) it also argues to use simple site specific bench-marks , based on sound theory and some previous analyses examples; further a S-waves (over time) survey based analysis to create portable statistical bench-marks and understand situations of ground motions mode conversions and amplifications with the help of spectral examination and curves matching, is demonstrated adequately.
Perspectives
The analyses itself is based upon robust physical principles of elastic wave propagation in fractured and/or defected anisotropic porous media. Given the scale of analysis undertaken , the sensitivity of the S-wave propagation/transmission was noticeable in providing or delineating the architectural, structural and rheological detail of the analogue of interest or subject unambiguously. So, in addition to field scale but micro- to nano-scale material evaluations using S-waves also appeared insightful and/or foreseeably practical.
Bilal Hassan
Memorial University of Newfoundland
Read the Original
This page is a summary of: Geotechnical Site Investigation Using S-waves with Implications for Ground Motion Analysis, Materials and Geoenvironment, January 2017, De Gruyter,
DOI: 10.1515/rmzmag-2017-0018.
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