Waveform inversion of the S reflector west of Spain: Fine structure of a detachment fault

T. Leythaeuser, Timothy Reston*, T. A. Minshull

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The S reflection west of Iberia has been interpreted as a low-angle detachment fault separating crustal fault blocks from partially serpentinized mantle. We apply full waveform inversion to investigate the fine structure of S. Our results confirm that S is largely a step increase in velocity (and density), probably from crustal rocks to partially serpentinized mantle peridotites. A ∼50 m thick low velocity zone above S might represent a main fault zone of highly serpentinized peridotites or hydrofractured and altered crustal rocks above the main fault zone. Both interpretations imply focused fluid flow along S, raising the possibility that low-angle movement along S was aided by the development of local, transient high fluid pressures.

Original languageEnglish
Article numberL22304
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume32
Issue number22
DOIs
Publication statusPublished - 28 Nov 2005

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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