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Why are GEOSoft predicted values often pessimistic compared to my eventually on-site measurements?

April 26, 2017eventually geosoft measurements on-site pessimistic predicted values

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Why are GEOSoft predicted values often pessimistic compared to my eventually on-site measurements?

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GEOSoft pressure values are given for one cluster, free-field. Considering hard floor reflections, these values can increase by 3dB. With left and right clusters overlapping, another 3dB can be gained. Therefore, GEOSoft values can easily be under-estimate performance by up to 6dB.