TY - RPRT TI - Integration of the Biot–Gassmann Fluid Substitution Method and Machine Learning-Based Velocity–Stress Relationship for Estimating In Situ Stresses AU - Mustafa, Ayyaz [Univ. of Pittsburgh, PA (United States)] (ORCID:0000000150607474) AU - Lu, Guanyi [Univ. of Pittsburgh, PA (United States)] AU - Bunger, Andrew P. [Univ. of Pittsburgh, PA (United States)] PY - 2026 DO - 10.1021/acsomega.5c09669 UR - https://www.osti.gov/biblio/3017931 ID - 3017931 ER -