High‐resolution electromagnetic imaging of the San Andreas Fault in central California

Unsworth, Martyn; Egbert, G. D.; Booker, J. R.

doi:10.1029/98jb01755

Cited by 114 publications

(69 citation statements)

References 38 publications

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“…A connection between this zone and a mid-crustal conductor is proposed by Becken et al (2008). A small fault-zone conductor was observed on the locked Carrizo segment (Mackie et al 1997;Unsworth et al 1999). The conductor extends to mid-crustal depths at Hollister where creeping movement on the faults are observed (Bedrosian 2002).…”

Section: Introductionmentioning

confidence: 99%

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

Schill

Pavez

Díaz

et al. 2016

Geophysical Journal International

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Section: Introductionmentioning

confidence: 99%

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

Schill

Pavez

Díaz

et al. 2016

Geophysical Journal International

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“…Electrical and electromagnetic geophysical techniques have been used in studies of fault zones in various parts of the world (e.g., Schnegg et al 1983Schnegg et al , 1986Jones et al 1992;Ingham & Brown 1998;Unsworth et al 1999). Such studies have generally been concerned with major transform or strike-slip faults and have been sensitive to the occurrence of low electrical resistivity (often resulting from the presence of fluids) within the fault zone.…”

Section: Introductionmentioning

confidence: 99%

Imaging the Wairarapa Fault at Tauwharenikau using magnetotelluric sounding

Borstel¹,

Ingham²

2004

New Zealand Journal of Geology and Geophysics

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To test the ability of closely spaced magnetotelluric data to provide high resolution images of fault structures, measurements have been made across the Wairarapa Fault at Tauwharenikau, southern North Island, New Zealand. 2D inversion and modelling of the TM-mode data from 11 sites on a 1.5 km long transect show the transition from conductive Tertiary sediments southeast of the fault zone to resistive greywacke to the northwest, and also illustrate some of the difficulties in interpretation that can arise. The existence of dual fault traces separated by some 100 m allows for two possible interpretations of the electrical structure: (1) that the southeastern fault trace represents the main trace of the Wairarapa Fault and that low resistivity to the northwest is the result of fluid percolation into fractured rock between the fault traces; or (2) that the northwestern fault trace marks the actual contact between Tertiary sediments and greywacke. In this case, the near-surface dip of the fault is constrained to be c. 80° to the northwest.

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“…The other is a deep resistor centered at $4 km depth. Note that this resistive structure was also imaged by previous inversions performed for MT data collected across the San Andreas Fault within the Carrizo Plain [Mackie et al, 1997;Unsworth et al, 1999]. At the same time it is commonly accepted that the Great Valley sedimentary units and the Fransiscan formation extend westward to the SAF [Page, 1981].…”

Section: Focusing Inversion Of Mt Data Collected In Carrizo Plain Camentioning

confidence: 65%

“…[27] High-resolution magnetotelluric data were collected across the San Andreas Fault (SAF) at Carrizo Plain, California for crustal imaging [Unsworth et al, 1999]. The TE and TM mode regularized weighted inversions with focusing were applied to these data.…”

Section: Focusing Inversion Of Mt Data Collected In Carrizo Plain Camentioning

confidence: 99%

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Two‐dimensional magnetotelluric inversion of blocky geoelectrical structures

Mehanee

Zhdanov

2002

J. Geophys. Res.

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[1] This paper demonstrates that there are alternative approaches to the magnetotelluric (MT) inverse problem solution based on different types of geoelectrical models. The traditional approach uses smooth models to describe the conductivity distribution in underground formations. In this paper, we present a new approach, based on approximating the geology by models with blocky conductivity structures. We can select one or another class of inverse models by choosing between different stabilizing functionals in the regularization method. The final decision, whose approach may be used for the specific MT data set, is made on the basis of available geological information. This paper describes a new way of stabilizing two-dimensional MT inversion using a minimum support functional and shows the improvement that it provides over traditional methods for geoelectrical models with blocky structures. The new method is applied to MT data collected for crustal imaging in the Carrizo Plain in California and to MT data collected for mining exploration by INCO Exploration.

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High‐resolution electromagnetic imaging of the San Andreas Fault in central California

Cited by 114 publications

References 38 publications

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

Imaging the Wairarapa Fault at Tauwharenikau using magnetotelluric sounding

Two‐dimensional magnetotelluric inversion of blocky geoelectrical structures

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