INVESTIGATION AND ANALYSIS OF SEISMIC WAVE PARAMETERS OF SEISMIC GAP, SEISMIC BELT AND FORESHOCK

摘要

Four earthquakes with magnitudes around M 6.0, which occurred in southeastern China since 1970, are studied based on six seismic wave parameters. These parameters include the rupture characteristic L_0/L, primary rupture directions, the ambient shear stress τ, the temporal periodicity of waveform, r, Q values for P-waves, and the width of Fourier spectrum, w. In this study, the six parameters for each earthquake are calculated, compared, and investigated in order to define single foreshocks. Errors caused by the digitization of analog records and application of simplified hypocenter and medium models, as well as the errors generated in measuring earthquake magnitude and hypocentral radius, are estimated and discussed. Primary characteristics of the earthquakes that occurred within the seismogenic zones and seismic belts are presented after processing 510 charts, 135 earthquakes, and 1030 records.