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Information - MPRG16 The role of fluids in faults and fracture zones - transport aspects
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Event Information |
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The generation and maintenance of high pore pressures are of major importance in the dynamics and rheology of fractured zones. A number of mechanisms and processes can lead to the generation of pore overpressures ranging from chemical to physical: for instance, porosity reduction by mechanical compaction, CO2 degassing and/or dehydrations by phase transformations, thermal pressurization / microcracking and fault lubrication by shear heating. The fact that fluid overpressures can cause faulting has been well-established for several decades. In such way, pore-pressure driven aftershocks, pore pressure induced aseismic creep events, earthquake triggering at long distance in geothermal areas and by magmatic pressure in volcanic areas have all emphasized the role fluids play in the redistributions of normal stresses.
Due to the difficulties in monitoring in-situ pore pressures and permeabilities in natural fault zones, little is known quantitatively on the exact role played by varying fluid
pressures in the field. Recent advances, however, have now started to shed light on these complex, coupled processes using complimentary laboratory, field and numerical methods; for example the use of Lattice-Bolzman simulations in pore scale permeability models, full waveform laboratory acoustic emission recording of fluid / melt migration at elevated temperatures and pressures simulating macro scale crustal processes, and fluid injection experiments in the field aiming to induce and investigate seismicity on fractured fault zones (e.g. SAFOD, California) and porous reservoirs (e.g. KTB, Hannover).
In the proposed session, we invite papers that investigate and analyse the process of solid-fluid coupling / interaction in fractured rock at all scales, and their consequences on transport properties and seismic signal generation. We particularly welcome contributions that utilize new and novel instrumentation and laboratory techniques, and papers that introduce present observations of natural seismicity both in tectonic and volcanic areas as well as field and laboratory experiments designed to trigger artificial faulting.
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