caa a22 4500 475813936 CHVBK 20180406123805.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1007/PL00001118 doi (NATIONALLICENCE)springer-10.1007/PL00001118 Characterization of Electrical Daily Variations Induced by Capillary Flow in the Non-saturated Zone [Elektronische Daten] [F. Perrier, P. Morat] —Electrical daily variations without an associated magnetic field were observed for a period of six weeks on independent parallel dipoles during the one-year electrode inter comparison experiment that took place in Garchy, France, from April 1995 to April 1996. These daily variations appeared suddenly during summer when the soil was dry on the surface. Their amplitude ranged from 0.1 to 1.5 mV for 50-m long dipoles, and characteristic relative phases. The amplitude of the variations was found to be related to soil temperature. These daily variations are accounted for in a model where streaming potentials are produced by coherent capillary flow in the non-saturated zone. Such daily variations are important to control in long-period magnetotelluric sounding and may be of practical use for agricultural applications. As their amplitude strongly depends on time-varying soil conditions, they may also lead to erroneous interpretations as earthquake precursors. Birkhäuser Verlag Basel,, 2000 Key Words: Spontaneous potential, capillary flow, soil physics, magnetotelluric sounding, streaming potentials, earthquake precursors nationallicence Perrier F. Laboratoire de Détection et de Géophsique, Commissariat à l'Energie Atomique, B.P. 12, F-91680, Bruyères-le-Châtel, France. E-mail: perrier@ldg.bruyeres.cea.fr, FR aut Morat P. Laboratoire de Géomagnétisme, Institut de Physique du Globe de Paris, 4, Place Jussieu, F-75252, Paris Cedex 05, France., FR aut https://doi.org/10.1007/PL00001118 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/PL00001118 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Perrier F. Laboratoire de Détection et de Géophsique, Commissariat à l'Energie Atomique, B.P. 12, F-91680, Bruyères-le-Châtel, France. E-mail: perrier@ldg.bruyeres.cea.fr, FR aut NATIONALLICENCE 700 1- Morat P. Laboratoire de Géomagnétisme, Institut de Physique du Globe de Paris, 4, Place Jussieu, F-75252, Paris Cedex 05, France., FR aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer