Evaluation of deep sediment velocity structure in the New Madrid seismic zone

Jordi Julià, Robert B. Herrmann, Charles James Ammon, Aybige Akinci

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Detailed knowledge of the physical properties of the sediments filling the Mississippi Embayment has proven critical to both unravel the tectonic framework operating in the region and assess the seismic hazards posed by the New Madrid Seismic Zone. In this article we show that independent geotechnical estimates for P-and S-wave velocities are compatible with a sedimentary model of K-feldspar clasts embeded in water, and we test its validity by modeling receiver functions at a number of broadband stations. By constraining the bulk sediment thicknesses beneath each station from independent reflection profiling estimates, we have been able to recover the depth to the top of the Cretaceous from the receiver function data at individual stations. Our receiver function modeling thus provides confidence in the velocity and density structures extrapolated from in situ geotechnical measurements in the Upper Mississippi Embayment.

Original languageEnglish (US)
Pages (from-to)334-340
Number of pages7
JournalBulletin of the Seismological Society of America
Volume94
Issue number1
DOIs
StatePublished - Jan 1 2004

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All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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