support by the Natural Basic Research Program of China (the ‘‘973 Project’’,Grant No. 2013CB733303);the National Natural Science Foundation of China (Grant Nos. 41304077, 40974079);Postdoctoral Science Foundation of China (Grant No. 2013M531744);Key Laboratory of Geospace Environment and Geodesy (Grant Nos. 12-02-03)
Wave-induced flow is observed as the domi- nated factor for P wave propagation at seismic frequencies. This mechanism has a mesoscopic scale nature. The inhomogeneous unsaturated patches are regarded larger than the p...