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Geophysical Research Letters
Article . 1994 . Peer-reviewed
License: Wiley Online Library User Agreement
Data sources: Crossref
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Seismic azimuthal anisotropy beneath the Pakistan Himalayas

Authors: Eric A. Sandvol; James F. Ni; Thomas M. Hearn; Steve Roecker;

Seismic azimuthal anisotropy beneath the Pakistan Himalayas

Abstract

Teleseismic S, SKS and SKKS data, collected from a temporary broadband array across the Himalayan front in Pakistan, are analyzed for shear‐wave splitting parameters. The SKS and SKKS phases have ray paths originating from both the South Pacific and Colombia which have azimuths approximately 40° apart with respect to the Pakistan array. If significant seismic azimuthal anisotropy is present we should observe splitting associated with one of these ray paths. No evidence was seen for any shear‐wave splitting beneath any of the stations in the array. Teleseismic S waves were also used in order to provide better azimuthal coverage for the shear‐wave splitting measurements. We were able to correct for any source‐side anisotropy when needed. No receiver‐side splitting was observed in any of the S wave data. The lack of shear‐wave splitting beneath the Pakistan array indicates that there is no appreciable large‐scale azimuthal anisotropy beneath this part of the Himalayas. Therefore, if there is any significant strain in the upper mantle beneath this area, it must either be vertically oriented, or, if horizontal, vertically vary in such a way that the integrated effect on S wave splitting is null.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
27
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Top 10%
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