Laboratory measurements anomalous 0.1-0.5 Hz streaming Potential under geochemical changes: Implications for electrotelluric precursors to earthquakes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research : Solid Earth Année : 1997

Laboratory measurements anomalous 0.1-0.5 Hz streaming Potential under geochemical changes: Implications for electrotelluric precursors to earthquakes

Résumé

Streaming potentials resulting from flow of various salt solutions in rock were measured on saturated sediments (Fontainebleau sandstones). The streaming potential ∃V was found to be proportional to the driving pore pressure ∃P. Pulses of amplitude 15-40 mV in the frequency range of 0.1 to 0.5 Hz were observed when the conductivity of the injected water was decreased and the fluid flow rate was relatively low, corresponding to a Darcian velocity of 17 to 30 cm/h. The amplitudes of these pulses are 47% to 133% of the corresponding steady components of the ∃V values. Such geochemically induced effects may possibly be responsible for the frequency signals from 0.1 to 0.5 Hz that were sometimes observed before an earthquake.
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Dates et versions

hal-00108296 , version 1 (08-02-2021)

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Laurence Jouniaux, Jean-Pierre Pozzi. Laboratory measurements anomalous 0.1-0.5 Hz streaming Potential under geochemical changes: Implications for electrotelluric precursors to earthquakes. Journal of Geophysical Research : Solid Earth, 1997, 102,B7 (B7), pp.15335-15343. ⟨10.1029/97JB00955⟩. ⟨hal-00108296⟩
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