Physics – Geophysics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3222304l&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 22, CiteID L22304
Physics
Geophysics
2
Exploration Geophysics: Seismic Methods (3025, 7294), Marine Geology And Geophysics: Marine Seismics (0935, 7294), Structural Geology: Dynamics And Mechanics Of Faulting (8118), Structural Geology: Role Of Fluids, Tectonophysics: Continental Margins: Divergent (1212, 8124)
Scientific paper
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.
Leythaeuser T.
Minshull Tim A.
Reston Timothy J.
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