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Published December 2017 | Supplemental Material + Published
Journal Article Open

Amplification and Attenuation across USArray using Ambient Noise Wavefront Tracking


As seismic traveltime tomography continues to be refined using data from the vast USArray data set, it is advantageous to also exploit the amplitude information carried by seismic waves. We use ambient noise cross correlation to make observations of surface wave amplification and attenuation at shorter periods (8–32 s) than can be observed with only traditional teleseismic earthquake sources. We show that the wavefront tracking approach can be successfully applied to ambient noise correlations, yielding results quite similar to those from earthquake observations at periods of overlap. This consistency indicates that the wavefront tracking approach is viable for use with ambient noise correlations, despite concerns of the inhomogeneous and unknown distribution of noise sources. The resulting amplification and attenuation maps correlate well with known tectonic and crustal structure; at the shortest periods, our amplification and attenuation maps correlate well with surface geology and known sedimentary basins, while our longest period amplitudes are controlled by crustal thickness and begin to probe upper mantle materials. These amplification and attenuation observations are sensitive to crustal materials in different ways than traveltime observations and may be used to better constrain temperature or density variations. We also value them as an independent means of describing the lateral variability of observed Rayleigh wave amplitudes without the need for 3-D tomographic inversions.

Additional Information

© 2017 American Geophysical Union. Received 30 JUL 2017; Accepted 9 NOV 2017; Accepted article online 15 NOV 2017. Data from USArray were downloaded from the IRIS Data Management Center at http://www.iris.edu/hq/. The velocity model of Schmandt et al. (2015) was downloaded from IRIS at http://ds.iris.edu/ds/products/emc-us-crustvs-2015/. Amplification and attenuation maps are included as supporting information, and other results are available upon request to dbowden@caltech.edu. This work was supported by EAR-1453263 and EAR-1252191. F.-C. L. was supported by NSF grant CyberSEES-1442665 and the King Abdullah University of Science and Technology (KAUST) under award OCRF-2014-CRG3-2300.

Attached Files

Published - Bowden_et_al-2017-Journal_of_Geophysical_Research__Solid_Earth.pdf

Supplemental Material - jgrb52427-sup-0001-2017JB014804_S01.txt

Supplemental Material - jgrb52427-sup-0002-2017JB014804_S02.txt

Supplemental Material - jgrb52427-sup-0003-2017JB014804_S03.txt

Supplemental Material - jgrb52427-sup-0004-2017JB014804_S04.txt

Supplemental Material - jgrb52427-sup-0005-2017JB014804_S05.txt

Supplemental Material - jgrb52427-sup-0006-2017JB014804_S06.txt

Supplemental Material - jgrb52427-sup-0007-2017JB014804_S07.docx


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August 21, 2023
October 17, 2023