Abstract
[1] We demonstrate a case of using teleseisms recorded on single-channel high-frequency geophones to image upper crustal structure around the Bighorn Mountains of north-central Wyoming, USA. Our approach produces images that are analogous to those from a low frequency version of conventional active source seismic reflection profiles except that wave fields from distant earthquakes are used as sources. After the source wavelet is removed from the seismograms, a distinct phase,PpPdp, is evident in the resultant record. After depth conversion, we show that this phase correlates well with the top of the Madison Formation under the Powder River and Bighorn Basins that flank the Bighorn Mountains. In addition, we combine the phases PpPdpfrom single-channel geophone recordings andPsfrom three-component recordings to constrain the averageVp/Vs ratio for the sedimentary strata.
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