Papers collected in this volume are focusing on anomalous pressures present in the crust. Some theoretical considerations and calculations of pressures at certain depths are proposed.
The pressure-depth relation can generally be obtained from a certain density-depth distributaion in the region. It is known from stress measurements that the horizontal stress is almost always great than the vertical stress. This indicates that tectonic stress may play some important role in the stress state.
Furthermore,some other additional stresses may also be generated by facies changes,metamorphism,crystallization in the crust. How the UHPM rocks now exposed at the surface were formed is open to discussion. Lu et at (1988) proposed a method for determination of pressure at some depth.