Geophysical Investigation of Lithosphere Structure Beneath Sri Lanka Using Surface and Internal Load Variations

H. M.I. Prasanna, Wu Chen, D. Gómez‐Ortiz

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1 Citation (Scopus)

Abstract

This paper describes a method for interpreting the lateral changes in the geological structure of the lithosphere by iteratively calculating the spatial variation of a bottom-to-top loading ratio. We use Forsyth’s coherence method, based on multi-taper spectral analysis on overlapping window areas. We discuss the geological findings and their comparison with existing geological interpretations for the Sri Lankan region. The low thickness of the elastic plate in the Sri Lankan region suggests a high geothermal gradient. The lithospheric geological structure beneath the Sri Lankan region is consistent with the main crustal units of Sri Lanka, which belong to different ancient plates. Together with interpretations based on metamorphic rock units, our findings support the existence of thrust contact in the central highlands of Sri Lanka.
Original languageEnglish
Pages (from-to)1951-1962
Number of pages12
JournalPure and Applied Geophysics
Volume171
Issue number8
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Crustal structure
  • Earth structure
  • Gravity anomalies
  • Gravity inversion
  • Moho discontinuity

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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