Abstract

Basaltic rocks are considered as a suitable candidates for carbon dioxide (CO₂) sequestration due to their high strength and mineral reactivity, however the geomechanical behavior of India’s Deccan Volcanic Province (DVP) remains poorly constrained. This study presents ultrasonic and triaxial testing of two Ambenali Formation lithofacies massive and flow-top brecciated basalts. P-wave arrivals were picked using crosscorrelation technique with a Kolmogorovfactorized minimum-phase reference. Velocities increased with increasing confining pressure (5– 30 MPa), suggesting elastic stiffening and progressive crack closure. Triaxial compression demonstrated strong lithofacies control; massive basalt showed cohesion (c) value of 26.8 MPa, internal friction angle