A STUDY ON THE SOURCE PARAMETERS OF MICROEARTHQUAKES IN LUANXIAN REGION

The high-precision digital seismic data for the Tangshan earthquake region were processed by the spectrum method. We have obtained the source parameters (including equivalent circular dislocation radii, seismic moments, stress drops and so on)for those earthquakes with magnitudes from 1.5 to 3.9 in this area. The values of source radii range from 0.07 to 0 21Km. The seismic stress drops vary with magnitude strongly, which are from several hundred thousand Pa to more than ten million Pa.