Investigation of the relationships between direct and semi-direct P-wave velocity measurement techniques in igneous rocks

Abstract

The non-destructive test of P-wave velocity has been commonly used to estimate the physical and strength values of materials (rocks, metals, concrete, etc.) in recent times in several disciplines (mining, geology, civil and materials engineering, archaeology, restoration, etc.). In general, direct measurement methods are commonly used for P-wave velocity, in recent times semi-direct and indirect measurement methods have begun to be chosen. In this study, cube samples with 10 cm edges were prepared from 41 different igneous rocks (plutonic, volcanic and pyroclastic). The correlations between P-wave velocities obtained with the direct measurement technique and the semi-direct measurement method were researched with the aid of simple regression (SR) and multiple linear regression (MLR). For the SR correlation of direct and semi-direct P-wave velocity, the lowest correlation coefficient was found to be 0.924. Values obtained with the semi-direct method for P-wave velocity measurement were larger than values obtained with direct measurement. Additionally, very high correlations were identified between the two measurement methods (>0.941) with MLR analysis.