Along-strike variations in underthrust sediment dewatering on the Nicoya margin, Costa Rica related to the updip limit of seismicity

Details Along-strike variations in underthrust sediment dewatering on the Nicoya margin, Costa Rica related to the updip limit of seismicity Along-strike variations in underthrust sediment dewatering on the Nicoya margin, Costa Rica related to the updip limit of seismicity

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3104613s&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 4, CiteID L04613

Physics

Geophysics

17

Marine Geology And Geophysics: Heat Flow (Benthic) And Hydrothermal Processes, Marine Geology And Geophysics: Marine Sediments-Processes And Transport, Marine Geology And Geophysics: Plate Tectonics (8150, 8155, 8157, 8158), Seismology: Earthquake Dynamics And Mechanics, Tectonophysics: Continental Margins And Sedimentary Basins

Scientific paper

Along the Costa Rican subduction zone offshore the Nicoya peninsula, an offset in the updip limit of seismicity coincides with a transition between subduction of warm crust generated at the Cocos-Nazca Spreading Center and cool crust formed at the East Pacific Rise. We evaluate whether the observed difference in thermal state of incoming crust would result in significant differences in sediment dehydration reaction progress along strike, thought to be a control on the updip limit of seismicity. We combine thermal models with models of dehydration reaction kinetics for opal and smectite to estimate the distribution of diagenetic fluid sources. The modeled distribution of diagenetic fluid sources mimics the pattern of the updip limit of seismicity; seismicity begins ~15-20 km landward of most of the smectite-to-illite transition. This suggests that the location of the updip limit of seismicity may be influenced by the dissipation of fluid overpressures landward of smectite-to-illite dehydration.

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