Feasibility Study on Determining Focal Mechanism Solutions of Small Earthquakes Using the Velocity Amplitude Ratio of -and -Waves

摘要

The focal mechanism parameters of small earthquakes are determined by the maximum velocity and displacement amplitude ratio of the direct -and -waves recorded by digital stations. The displacement is obtained from the velocity by emulation, and the two results are compared and analyzed. Results of theoretical analysis and practical measurement indicate that the two results of velocity and displacement are consistent, and it is feasible that the maximum displacement amplitude ratio be replaced by the maximum velocity amplitude ratio of the direct -and -waves recorded by regional seismic networks when determining focal mechanism solutions of small earthquakes.