On the geoelectric structure of major strike-slip faults and shear zones

Martyn Unsworth; Paul A. Bedrosian

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On the geoelectric structure of major strike-slip faults and shear zones

机译：重大走滑断层和剪切带的地电结构

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Magnetotelluric imaging of the San Andreas Fault has shown that seismically-active segments are characterized by a zone of low resistivity in the upper crust. Similar resistivity features are observed on other major strike-slip faults, and may have a common origin in a region of fractured rock, partially or fully saturated with groundwater. Other strike-slip faults show possible zones of reduced resistivity in the mid and lower crust that may be related to zones of ductile shear. Additional MT surveys are required to elucidate the role of fluids in controlling the seismic behaviour of major faults, both in and below the seismogenic zone. A set of synthetic inversions show that MT data is sensitive to the geoelectric structure of a shear zone at mid-crustal depths.

机译：圣安德烈亚斯断层的大地电磁成像表明，地震活动段的特征是上地壳的低电阻率带。在其他主要的走滑断层上也观察到了类似的电阻率特征，并且可能是在裂隙岩的一个共同点，部分或全部被地下水饱和。其他走滑断层表明中，下地壳电阻率可能降低，这可能与韧性剪切带有关。需要进行额外的MT勘测，以阐明流体在控制地震发生带内外的主要断层的地震行为中的作用。一组综合反演表明，MT数据对中地壳深度剪切带的地电结构敏感。

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《Earth, planets and space: EPS》 |2004年第12期|共8页
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Martyn Unsworth; Paul A. Bedrosian;
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7. On the geoelectric structure of major strike-slip faults and shear zones [O] . Martyn Unsworth, Paul A. Bedrosian 2014

机译：重大走滑断层和剪切带的地电结构
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On the geoelectric structure of major strike-slip faults and shear zones

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