[1] In this study, we have determined the crustal structure using three different receiver function methods using data collected from the northern transect of the Continental Dynamics of the Rocky Mountains (CD-ROM) experiment. The resulting migrated image and crustal thickness determinations confirm and refine prior crustal thickness measurements based on the CD-ROM and Deep Probe experiment data sets. The new results show a very distinct and thick lower crustal layer beneath the Archean Wyoming province. In addition, we are able to show its termination at 42°N latitude, which provides a seismic tie between the CD-ROM and Deep Probe seismic experiments and thus completes a continuous north-south transect extending from New Mexico into Alberta, Canada. This new tie is particularly important because it occurs close to a major tectonic boundary, the Cheyenne belt, between an Archean craton and a Proterozoic terrane. We used two different stacking techniques, based on a similar concept but using two different ways to estimate uncertainties. Furthermore, we used receiver function migration and common conversion point (CCP) stacking techniques. The combined interpretation of all our results shows (1) crustal thinning in southern Wyoming, (2) strong northward crustal thickening beginning in central Wyoming, (3) the presence of an unusually thick and high-velocity lower crust beneath the Wyoming province, and (4) the abrupt termination of this lower crustal layer north of the Cheyenne belt at 42°N latitude.

We present the results from receiver function analysis applied to a comprehensive data set in the Eastern Alps. Teleseismic events were recorded at 70 stations with an average deployment of 1 year. The investigated area includes the eastern part of the Eastern Alps and their transition to the Bohemian Massif, the Pannonian domain, and the Southern Alps. The crustal structure at each station is examined with the Zhu-Kanamori (ZK) method, which yields well-resolved interface depths in laterally homogeneous media with limited layering. The application of the ZK technique is challenged because of the complex tectonic setting; therefore, we include additional constraints from recent active-source seismic studies. In particular, the well-known crustal P-wave velocity and, where available, the V p /V s ratio are kept fixed, thus reducing the ambiguity in determining Moho depths. Individual depth values vary strongly between adjacent stations, showing that the employment of the ZK technique in tectonically complex settings is limited. We therefore avoid interpreting the results in detail, but rather compare them to existing crustal models of the Eastern Alps. We regard this receiver function study in the easternmost part of the Alps as a documentation of a data set that has potential to be exploited in the future.

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