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Q_Lg Distribution in the Basin and Range Province of the Western United States

¹ Department of Earth and Planetary Sciences
Washington University
St. Louis, Missouri 63130-4899

Q values for the direct L_g phase () were estimated for event-station paths that lie entirely within the western United States, particularly in the southern Great Basin and surrounding areas. The Q_o ( at 1 Hz) values were estimated by fitting synthetic spectra to observed L_g spectra using a genetic algorithm technique. We have created a tomographic image of the variations of Q_o for a part of the southwestern United States. The image shows that Q_o varies between about 234 and 312 at 1 Hz, with an average of 267. The lowest Q_o occurs in the northwest part of the Basin and Range Province, where extensional deformation has occurred since the Mesozoic. Q_o values start to increase toward the Colorado Plateau to the east and continue to gradually increase northward and decrease southward. We also find relatively high frequency dependence to the values, with a 1D mean of = 0.57.

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