[S03-P] Poster

[S03-P-01] Separation of intrinsic attenution and scattering loss for the contiguous US

Tom Eulenfeld^{1, 2}, ^○Ulrich Wegler² (1.BGR, Hannover, Germany, 2.Universitaet Jena)

We invert 10 years of earthquake envelopes registered by the USArray to construct maps of S-wave intrinsic and scattering attenuation of the crust beneath the contiguous US in the frequency range 1 Hz to 20 Hz. We also report site amplification factors and a comparison of estimated moment magnitudes with Richter magnitudes determined by the Array Network Facility (ANF). We observe a distinct west-east decline of intrinsic attenuation for high frequencies corresponding to the west-east transition from young, hot rocks to old and cold rocks. Scattering loss on the other hand depicts a raising west-east trend, but generally has a higher spatial variation than intrinsic attenuation. The crust in the western part of the United States appears to be more homogeneous on the relevant length scales than the crust in the eastern part.