Abstract
An earthquake with epicentre located at 26.61°N, 97.03°E is studied for its moment tensor components, using vertical component Rayleigh wave records from a number of stations. As the moment components are sensitive to source geometry and earth model, determination of focal parameters on the basis of first motion P-wave data forms the first step in the analysis. Further, as an idealization, values of the phase and group velocities are assumed for a standard Gutenberg layered earth model. Rayleigh wave spectra corrected for instrument response and attenuation effects of the medium are used for the calculation of moment tensor components. The basis of this analysis is the theoretical relationship between spectra of the vertical component of displacement of Rayleigh waves with the space derivatives of the Green's function and seismic moment tensor components. This is discussed briefly in the text. Least square linear inversion is adopted to optimize the solution for moment tensor components and then to calculate the most likely focal depth. Total seismic moment, stress drop and average dislocation on the fault are calculated using spectra of body waves after applying the necessary corrections. It is concluded that the total moment and its components have characteristic lower values. Interpretation of the result is included.
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