THE FOCAL MECHANISM OF LOW MAGNITUDE SUBCRUSTAL EARTHQUAKES OF VRANCEA RETRIEVED BY HIGH FREQUENCY WAVEFORM INVERSION

摘要

The goal of this work is to test the capability of high frequency local waveform inversion to retrieve the source of low magnitude intermediate depth earthquakes of Vrancea region. Following a similar procedure to that previously developed to analyze the weak shallow events from the Eastern Carpathians bending zone, we obtain a fairly robust estimate of the orientation of the double couple component of the seismic moment tensor. The resolution of the resolved fault plane solution allows correlations with the stress field in the area; this opens perspectives to using the small subcrustal earthquakes, frequently recorded, to obtain detailed information on the process taking place in the Vrancea focal region.