The theory and method of variable frequency directional seismic wave under the complex geologic conditions

Tao Jiang, Jilin University, Key Laboratory of Geophysical Exploration Equipment,Ministry of Education, Changchun, China; Jilin University, College of Instrumentation & Electrical Engineer, Changchun, China and Yonggao Yue, Jilin University, Key Laboratory of Geophysical Exploration Equipment,Ministry of Education, Jilin, China; Jilin University, College of Instrumentation & Electrical Engineer, Jilin, China