Seismic properties of crystalline rocks and geological
and geophysical implications
Ji Shaocheng1,2, Wang Qian1, Sun Shengsi1
1.Département des Génies Civil|Géologique et des Mines|cole Polytechnique de Montréal|Montréal|Québec|H3C 3A7|Canada； 2.Laboratory of Continental Geodynamics|Institute of Geology|Chinese Academy of Geological Sciences|Beijing |100037
Our knowledge of the chemical composition，physical state and structure of the Earths interior mainly comes from seismic data. Interpretation of seismic data，in turn，is largely constrained by the extrapolation of laboratorymeasured seismic properties of relevant rocks thought to exist in a given geological and physical(iepressure and temperature)environment. Thus，laboratory studies of rock seismic properties as functions of pressure and temperature are particularly important for correct interpretation of insitu seismic data. Breakthroughs in the understanding of rock seismic properties and in the development of innovative technologies for multiscale observations and quantitative measurements of seismic velocities and anisotropy in the Earths interior have taken seismology as one of the most active new frontiers of solid Earth sciences during the last decades. The aim of this article is to provide a critical overview on several important aspects of rock seismic properties：seismic velocity hysteresis，velocitypressure relationship，correlations between P and Swave velocities，and Poissons ratio and its implications for the composition and tectonic evolution of the continental crust. This paper is dedicated to Professor Wenyou Zhang，a former member of the Chinese Academy of Sciences，on the occasion of his 100th birthday.