Applications of Higher Mode Surface Waves
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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Amplitudes of first higher mode Love waves from seismic events in North America were measured on the North American continent and corrected for attenuation, structure, and distance. The corrected amplitudes were fitted to a source model to estimate the source depth. The high value of the attenuation coefficient and lack of a good seismic model prevented good agreement between known and calculated depths. In order to estimate the effect of the seismic source structure, the ratio of the first higher mode to fundamental Love wave amplitudes was found experimentally and compared to the theoretical prediction. Agreement was better than for the spectral fitting method but was still short of being satisfactory.