Evaluate Reliability of f-k and SPAC Methods

Abstract eng:
In recent years, microtremors observation was widely in use for estimation of the sub-surface S-wave velocity (Vs) structure. To evaluate reliability of ambient vibration array methods in Microtremor data analysis and to compare ones results for a same known field, a set of Microtremor array records was performed in selected site in Tehran (Iran capital). Furthermore, the results of in-situ tests like SPT, PS-Logging and DownHole (to 200m depth) and Refraction-Reflection of wave tests exist in the site and Vs profile is available. Therefore, it is possible to compare the results of Microtremor data processing (by two Array methods: f-k and SPAC method) and existing Vs profile (by In-situ tests). This paper focuses on reliability evaluation and precision of array methods with small aperture arrays. By defining 3 errors types (Boundary detect error, Velocity detect error and Total error) relationships between array geometry (station number and distance …), data recording times, input vibration types (human or natural) and quantity or quality of results agreement in depth ranges that show more reliability are studied. As a striking result, the SPAC method is probably more convenient compared to the f–k method, because it gives results as well as the f–k method by using less recording stations and with shorter dimensions arrays. However, the topic would deserve thorough further investigations.

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