jgg     2015 35 (5):  871-875    ISSN: 0412-1961  CN: 21-1139/TG The Temporal and Spatial Distribution Characteristics of Seismic  Wave Velocity Ratio in Shanxi Reservoir Earthquake Administration of Zhejiang Province，7 Tangmiao Road, Hangzhou 310007，China Received: 2014-09-02  Revised: null  Online: 2015-10-10 Supporting info