Biomarker thermal maturity experiments at earthquake slip rates

作者: Heather M. Savage , Hannah S. Rabinowitz , Elena Spagnuolo , Stefano Aretusini , Pratigya J. Polissar

DOI: 10.1016/J.EPSL.2018.08.038

关键词: Slip (materials science)SlippingOil shaleSeismic slipShear (geology)PetrologyFault mechanicsGeology

摘要: Abstract Evidence of temperature rise is useful for identifying where within a fault zone earthquake slip has occurred, as well some attributes the such energy output. Biomarker thermal maturity can elucidate structures that were hotter than surrounding rock, and therefore likely to have hosted earthquakes. We performed series friction experiments on thin gouge layers Woodford shale at rates 1 m/s. Our results show biomarker clearly delineate zones are 150 μm. establish kinetics methylphenanthrene reaction previously determined longer durations lower temperatures applicable seismic timescales. Temperature estimates once slipping reached ∼500 °C, was significant, predicted by kinetics. demonstrate in function both work density power during earthquake. reactions, along with other Arrhenius-style reactions those lead dynamic shear weakening, speed frictional work.

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