This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1111/1365-2478.12744. This article is protected by copyright. All rights reserved. Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: Part 1 – Experimental results Sirikarn Narongsirikul 1,3 , Nazmul Haque Mondol 1,2 , and Jens Jahren 1 1 University of Oslo 2 Norwegian Geotechnical Institute (NGI) 3 ConocoPhillips Norway Contact Author: Sirikarn Narongsirikul Affiliations: University of Oslo and ConocoPhillips Norway E-mail: sirikarn_nar@hotmail.com KEYWORDS Acoustic, porosity, rock physics, overconsolidated sands, experimental compaction, uplift ABSTRACT This paper part one is set out to lay primary observations of experimental compaction measurements to form the basis for rock physics modelling in paper part two. P- and S-wave velocities and corresponding petrophysical (porosity and density) properties of seven unconsolidated natural sands with different mineralogical compositions and textures are reported. The samples were compacted in a uniaxial strain configuration from 0.5 up to 30 MPa effective stresses. Each sand sample was subjected to three loading cycles to study the