Introduction to compaction/subsidence - introduction to tectonics and sedimentation (E.C. Donaldson, G.V. Chilingarian, T.F. Yen). Compaction of argillaceous sediments (G.V. Chilingarian, H.H. Rieke, E.C. Donaldson). Stresses in sediments (E.C. Donaldson, G.V. Chilingarian, H.H. Rieke). Possible impact of subsidence on gas leakage to the surface from subsurface oil and gas reservoirs (A.E. Gurevich, G.V. Chilingarian). Subsidence studies in Italy (G. Brighenti, G.C. Borgia, E. Mesini). Subsidence in the Wilmington Oil Field, Long Beach, California, USA (X.C. Colazas, R.W. Strehle). Subsidence in Venezuela (A. Finol, Z.A. Sancevic). Reservoir compaction and surface subsidence in the North Sea Ekofisk field (M.M. Zaman, A. Abdulraheem, J.-C. Roegiers). Appendix A: Simulation of compaction due to fluid withdrawal (E.C. Donaldson). Appendix B: Surveillance technology to detect and monitor compaction and subsidence effects (W. Fertl, G.V. Chilingarian, E.C. Donaldson). Appendix C: Use of the global positioning system (GPS) for ground subsidence monitoring (B. Endres, G.V. Chilingarian).