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Fig. 5 | Swiss Journal of Geosciences

Fig. 5

From: SAPHYR: Swiss Atlas of Physical Properties of Rocks: the continental crust in a database

Fig. 5

Example of velocity curves from laboratory experiments (error bars within the symbols). a, b Effect of increasing pressure and temperature respectively on P and S waves; In a it is shown how intrinsic Vp0 and Vs0 are calculated from the intercept of the linear regression of the high pressure part of the curve (here above 150 MPa), and how they differ from room pressure. While for some application a “bulk” velocity might be sufficient, for many other applications the dependency of velocity over the direction of measurement and the anisotropy are important. c Shows a complete dataset of velocities measured along the main structural direction X = parallel to lineation, Y = perpendicular to lineation in the foliation or bedding plane, and Z perpendicular to foliation or bedding, as shown in the inset. Vs measured along the three structural direction are distinguished on the basis of the polarization plane, as shown in the inset. As Example Vszy is the S waves propagating perpendicular to foliation and with polarization in the zy plane, i.e. the plane normal to lineation. In this example, the velocities measured along the structural directions are quite different. The anisotropy calculated as (Vmax − Vmin)/V average is also show in think dash line for Vp, and in grey dash line for Vs

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