SOURCE CHARACTERISTICS OF EARTHQUAKES IN AND AROUND DELHI

Abstract

The scope of this work involved the analysis and estimation of source parameters for a dataset from seismic networks named Delhi Telemetry Network which included a total of 28 recorded in the years 2009-20 13. The dataset consisted of earthquakes that occurred primarily in the Delhi region, India. The source parameters estimated are Stress drop, Corner Frequency, Source Radius, Local Magnitude and Moment Magnitude. S-phase spectra from the events was modelled as per the Brune model to arrive at the results. The results obtained after locating events and calculating source parameters and generating relationships between them, showed that the results followed the standard observations in case of variation of Local Magnitude with Moment Magnitude. Corner frequency variations with the magnitudes also conform to the established results but vary in the degree of conformity. Of the relationships that deviated from the norm of source parameter interrelationships include the variation stress drop with both magnitudes and the fact that moment magnitudes have lower value than local magnitudes. Some results however deviated from the normalcy and failed to form a decent relationship because of the meagre number of events.