Seismic monitoring is essential for safe development of the geothermal resources. In the absence of large number of pre-existing seismicity, the monitoring performance of a network must be determined by network design modeling. Such modeling is dependent on both P-wave and S-wave velocity and P-wave and S-wave attenuation models. While P-waves are usually known (reflection surveys or sonic logs), S-wave models need additional constrains, especially in the shallow part of the model where there are no constrains from sonic logs.