Seismic detectability of anomalous structure at the top of the Earth's outer core with broadband array analysis of SmKS phases

Details Seismic detectability of anomalous structure at the top of the Earth's outer core with broadband array analysis of SmKS phases Seismic detectability of anomalous structure at the top of the Earth's outer core with broadband array analysis of SmKS phases

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..141..141t&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 141, Issue 3, p. 141-152.

Physics

2

Scientific paper

I have examined precisely the differential travel times and waveforms of SmKS seismic phases propagating under the southern Indian Ocean obtained from African broadband seismic arrays. The SmKS phases analyzed in this study travel in the mantle with weak heterogeneity confirmed by a global tomographic study for the distance range of 115-135°. The SmKS differential times were obtained from a vespagram (a stack intensity on a time-slowness diagram), and comparison with the vespagram created from synthetic waveforms with PREM gives the travel-time residual for each event-array pair. Although the residuals of S3KS-S2KS times exhibit apparently a systematic dependence on epicentral distance, this is likely due to small-scale heterogeneity beneath the Oceania where is covered by the SmKS ray entering points at the CMB. Waveform modeling was applied to a record section with a small travel-time residual that suggests a small effect from the mantle heterogeneity on the data set, I found that a low-velocity zone in the outermost 50km in the core rather than PREM can explain an additional arrival detected just after the S3KS phase. This result is still inconclusive because of the small number of data and non-uniqueness of the model and ambiguity due to mantle structure. However, accumulation of the precise measurement described in this study may help the reduction of uncertainty and trade-offs.

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