3D electrical resistivity imaging of the near-surface structure of mud-volcano vents

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• 作者：Hermann Zeyen^a ; ^{hermann.zeyen@u-psud.fr"" rel=""nofollow} ; Marc Pessel^a ; Bé ; atrice Ledé ; sert^b ; Ronan Hé ; bert^b ; Daniè ; le Bartier^c ; Mika&#xeb ; l Sabin^b ; Siegfried Lallemant^b
• 关键词：Resistivity ; Tomography ; Mud volcano ; New Zealand ; Hikurangi accretionary prism
• 刊名：Tectonophysics
• 出版年：2011
• 出版时间：15 August 2011
• 年：2011
• 卷：509
• 期：3-4
• 页码：181-190
• 全文大小：3798 K

文摘

A near-surface study of the 3D electrical resistivity distribution of a cold mud volcano field in New Zealand is presented. Inversion of 16 densely spaced profiles allowed to image the uppermost 25–30 m. The mud distribution is characterized by areas of very low resistivity (less than 7 Ωm) embedded in river terrace sediments with resistivities of above 30 Ωm. Within the first 4–6 m below the surface, a good correlation between mud vents and low electrical resistivities is observed. Between ca. 5 and 15 m depth, in contrast, the mud distribution does not reflect anymore the distribution of surface vents but is restrained to a few pipe-like structures that link a deeper mud reservoir to the vents at the surface. The obtained resistivity distribution allows also locating the Masterton strike-slip fault just north of the mud volcano field, confirming the role of this fault as conduit of the mud from deeper layers to the surface.