Improving seismic resolution of outermost core structure by multichannel analysis and deconvolution of broadband SmKS phases

DW Eaton, J-M Kendall

Research output: Contribution to journalArticle (Academic Journal)peer-review

31 Citations (Scopus)

Abstract

The presence of a thin (≤12 km) layer atop the outermost core has important implications for the geodynamic and geomagnetic nature of the Earth, but detecting such a layer is difficult. SmKS seismic phases, which traverse the mantle as an S-wave and reflect m − 1 times from the underside of the core–mantle boundary (CMB), offer a means to test proposed models since they are extremely sensitive to the velocity structure of the outermost core. To improve seismic resolution in this region, we have developed and validated a modified vespagram (slant stack) technique that makes use of phase-independent amplitude-envelope traces. Confidence limits on arrival-time and slowness estimates are obtained by bootstrap resampling. In order to mitigate the effects of waveform complexity and facilitate comparison between observed and modeled waveforms, we have used a simple deconvolution method similar to techniques used in exploration seismology. We have applied these methods to high-quality broadband recordings of three deep-focus earthquakes recorded by seismic arrays in Canada. Some of our measurements have turning depths
Translated title of the contributionImproving seismic resolution of outermost core structure by multichannel analysis and deconvolution of broadband SmKS phases
Original languageEnglish
Pages (from-to)104 - 119
Number of pages16
JournalPhysics of the Earth and Planetary Interiors
Volume155 (1-2)
DOIs
Publication statusPublished - Apr 2006

Bibliographical note

Publisher: Elsevier

Fingerprint

Dive into the research topics of 'Improving seismic resolution of outermost core structure by multichannel analysis and deconvolution of broadband SmKS phases'. Together they form a unique fingerprint.

Cite this