Changes in Electrokinetic Coupling Coefficients of Granite under Triaxial Deformation
Electrokinetic phenomena are believed to be the most likely origin of electromagnetic signals preceding or accompanying earthquakes. The intensity of the source current due to the electrokinetic phenomena is determined by the fluid flux and the electrokinetic coupling coefficient called streaming cu...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2012/290915 |
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| _version_ | 1832550182519046144 |
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| author | Osamu Kuwano Shingo Yoshida |
| author_facet | Osamu Kuwano Shingo Yoshida |
| author_sort | Osamu Kuwano |
| collection | DOAJ |
| description | Electrokinetic phenomena are believed to be the most likely origin of electromagnetic signals preceding or accompanying earthquakes. The intensity of the source current due to the electrokinetic phenomena is determined by the fluid flux and the electrokinetic coupling coefficient called streaming current coefficient; therefore, how the coefficient changes before rupture is essential. Here, we show how the electrokinetic coefficients change during the rock deformation experiment up to failure. The streaming current coefficient did not increase before failure, but continued to decrease up to failure, which is explained in terms of the elastic closure of capillary. On the other hand, the streaming potential coefficient, which is the product of the streaming current coefficient and bulk resistivity of the rock, increased at the onset of dilatancy. It may be due to change in bulk resistivity. Our result indicates that the zeta potential of the newly created surface does not change so much from that of the preexisting fluid rock interface. |
| format | Article |
| id | doaj-art-0236a737049e464a81ef68e329518feb |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-0236a737049e464a81ef68e329518feb2025-02-03T06:07:22ZengWileyInternational Journal of Geophysics1687-885X1687-88682012-01-01201210.1155/2012/290915290915Changes in Electrokinetic Coupling Coefficients of Granite under Triaxial DeformationOsamu Kuwano0Shingo Yoshida1Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, JapanEarthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, JapanElectrokinetic phenomena are believed to be the most likely origin of electromagnetic signals preceding or accompanying earthquakes. The intensity of the source current due to the electrokinetic phenomena is determined by the fluid flux and the electrokinetic coupling coefficient called streaming current coefficient; therefore, how the coefficient changes before rupture is essential. Here, we show how the electrokinetic coefficients change during the rock deformation experiment up to failure. The streaming current coefficient did not increase before failure, but continued to decrease up to failure, which is explained in terms of the elastic closure of capillary. On the other hand, the streaming potential coefficient, which is the product of the streaming current coefficient and bulk resistivity of the rock, increased at the onset of dilatancy. It may be due to change in bulk resistivity. Our result indicates that the zeta potential of the newly created surface does not change so much from that of the preexisting fluid rock interface.http://dx.doi.org/10.1155/2012/290915 |
| spellingShingle | Osamu Kuwano Shingo Yoshida Changes in Electrokinetic Coupling Coefficients of Granite under Triaxial Deformation International Journal of Geophysics |
| title | Changes in Electrokinetic Coupling Coefficients of Granite under Triaxial Deformation |
| title_full | Changes in Electrokinetic Coupling Coefficients of Granite under Triaxial Deformation |
| title_fullStr | Changes in Electrokinetic Coupling Coefficients of Granite under Triaxial Deformation |
| title_full_unstemmed | Changes in Electrokinetic Coupling Coefficients of Granite under Triaxial Deformation |
| title_short | Changes in Electrokinetic Coupling Coefficients of Granite under Triaxial Deformation |
| title_sort | changes in electrokinetic coupling coefficients of granite under triaxial deformation |
| url | http://dx.doi.org/10.1155/2012/290915 |
| work_keys_str_mv | AT osamukuwano changesinelectrokineticcouplingcoefficientsofgraniteundertriaxialdeformation AT shingoyoshida changesinelectrokineticcouplingcoefficientsofgraniteundertriaxialdeformation |