A water-rich transition zone beneath the eastern United States and gulf of Mexico from multiple ScS reverberations

Anna M. Courtier, Justin Revenaugh

Research output: Chapter in Book/Report/Conference proceedingChapter

11 Scopus citations

Abstract

We examine mantle discontinuities beneath the United States and Gulf of Mexico using multiple ScS reverberations from earthquakes in Central and South America captured by 65 broadband and long-period seismometers across the United States. The depths of discontinuities and the impedance contrasts across them were estimated using a hierarchical waveform inversion and stacking method. The path-averaged depth of the 410-km discontinuity varies moderately across the study area and is particularly shallow (~395 km) beneath the eastern United States. Topography on the 660-km discontinuity is more subdued and is close to the global mean depth. The 520-km discontinuity is seen consistently across the study area, though both the depth and the impedance contrast of the discontinuity vary significantly. Corridors in the eastern United States and Gulf of Mexico have extremely strong 520-km discontinuities relative to the corresponding 410-km and 660-km discontinuities. We attribute the shallow 410-km and strong 520-km discontinuities beneath the eastern United States and Gulf of Mexico to a locally water-rich transition zone.

Original languageEnglish (US)
Title of host publicationEarth?s Deep Water Cycle, 2006
PublisherBlackwell Publishing Ltd
Pages181-193
Number of pages13
Volume168
ISBN (Electronic)9781118666487
ISBN (Print)9780875904337
DOIs
StatePublished - Jan 1 2006

Publication series

NameGeophysical Monograph Series
Volume168
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

Keywords

  • Earth-Mantle
  • Geodynamics
  • Geology, Structural
  • Groundwater
  • Hydrologic cycle

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    Courtier, A. M., & Revenaugh, J. (2006). A water-rich transition zone beneath the eastern United States and gulf of Mexico from multiple ScS reverberations. In Earth?s Deep Water Cycle, 2006 (Vol. 168, pp. 181-193). (Geophysical Monograph Series; Vol. 168). Blackwell Publishing Ltd. https://doi.org/10.1029/168GM14