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Volumn 282, Issue 5389, 1998, Pages 718-720

Three-dimensional structure at the base of the mantle beneath the central Pacific

Author keywords

[No Author keywords available]

Indexed keywords

MANTLE STRUCTURE; SEISMIC VELOCITY; VELOCITY STRUCTURE;

EID: 0032561247     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.282.5389.718     Document Type: Article
Times cited : (76)

References (37)
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    • A finite difference (FD) modeling approach is desirable to forward model not only travel times but also wave-forms in 3D. Such modeling is computationally heavy and not well suited for a trial and error approach unless the model space is restricted by using independent constraints. On the other hand, travel times can be modeled by using much more expedient ray approaches, which can provide well-constrained starting models for the more refined FD waveform modeling. We have computed synthetic travel time residuals for available tomographic models by using ray theory. The ray tracing was done in the spherically symmetric PREM model (13). We verified that, within the accuracy of the measurements (1 to 2 s), the results obtained for S and SKS were consistent with computations made with an acoustic 2D FD SH algorithm [J. E. Vidale, thesis, California Institute of Technology (1987)].
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    • note
    • We thank Ed Garnero for making his data available to us and for helpful discussions and two anonymous referees for constructive reviews. This work was funded by IGPP/LLNL grant 98-GS014. This is Seismological Laboratory contribution 98-04.


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