Complex anisotropy in D′′ beneath the eastern Pacific from SKS–SKKS splitting discrepancies
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چکیده
منابع مشابه
Lowermost mantle anisotropy beneath the northwestern Pacific: Evidence from PcS, ScS, SKS, and SKKS phases
[1] In this study, we utilize data from broadband seismic stations of the Japanese F-net network to investigate anisotropic structure in the lowermost mantle beneath the northwestern Pacific. The comparison of shear wave splitting from phases that have similar paths in the upper mantle but different paths in the lowermost mantle, such as PcS/ScS or SKS/SKKS, can yield constraints on anisotropy ...
متن کاملComplex seismic anisotropy at the border of a very low velocity province at the base of the Earth’s mantle
[1] We constrain the anisotropy associated with a very low velocity province (VLVP) at the base of the Earth’s mantle using the SKS and SKKS waves sampling the region. Our selected high-quality data sets consist of 415 SKS and 111 SKKS waveforms for 127 deep earthquakes recorded at distances between 90 and 150 by the seismic stations in three temporary broadband PASSCAL seismic arrays: the Kaap...
متن کاملDistinctive upper mantle anisotropy beneath the High Lava Plains and Eastern Snake River Plain, Pacific Northwest, USA
[1] The Pacific Northwest (PNW) has experienced voluminous intraplate volcanism over the past 17 Ma, beginning with the Steens/Columbia River flood basalts and continuing with the stillongoing volcanism in the High Lava Plains (HLP) and eastern Snake River Plain (SRP). Here we present two complementary datasets (SKS splitting and Rayleigh wave phase velocity anisotropy) that place constraints o...
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Seismic anisotropy in the upper mantle beneath continental interiors is generally complicated, with contributions from both the lithosphere and the asthenosphere. Previous studies of SKS splitting beneath the eastern United States have yielded evidence for complex and laterally variable anisotropy, but until the recent arrival of the USArray Transportable Array (TA) the station coverage has bee...
متن کاملAuxiliary Material for Paper 2004JB003574 A strong lateral shear velocity gradient and anisotropy heterogeneity in the lowermost mantle beneath the southern Pacific
Figure S2 shows the geographic distribution of dT(SKKS-SKS) at CMB entry and exit points, and a general agreement with the trend in the tomography model SAW24B16, though the amplitude of the anomaly is not well matched. It is difficult to quantify the relative contribution to dT(SKKS-SKS) from either the eastern of western borders due to the ambiguity imparted by our limited azimuthal sampling....
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تاریخ انتشار 2009