Seismic electric signals from displacement of charged dislocations

Slifkin, Lawrence

doi:10.1016/0040-1951(93)90066-s

Cited by 82 publications

(28 citation statements)

References 5 publications

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“…Other researchers [3,4] attributed such phenomena to the piezoelectric effect because their material samples contained piezoelectric components. Electric signals are also observed simultaneously with crack propagation in non-piezoelectric materials indicating the existence of additional electrification phenomena like lattice separation and bond breaking, acceleration of free electrons and other charges [5][6][7].…”

Section: Introductionmentioning

confidence: 98%

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Kyriazopoulos

Anastasiadis

Triantis

et al. 2011

Construction and Building Materials

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This paper introduces the possibility of in-situ assessment of loading and remaining strength in concrete structures by means of measuring discharge of electric current from loaded specimens.The paper demonstrates that the techniques have been applied to other rock-like materials, but that for the first time they are applied to cement based materials and a theoretical model is proposed in relation to the appearance of electrical signals during sample loading and up to fracture.A series of laboratory experiments on cement mortar specimens in simple uniaxial compression, and subsequently in bending -hence displaying both tension and compression -are described and show clear correlations between resulting strains and currents measured. Under uniaxial loading there is a well-defined relationship between the pressure-stimulated current (PSC) as a result of a monotonic mechanical loading regime.Similar results are observed in the three-point bending tests where a range of loading regimes is studied, including stepped changes in loading.While currents can be measured at low strains, best results seem to be obtained when strains approach and exceed yield stress values.This technique clearly has immense potential for structural health monitoring of cementbased structures. Both intermittent and continuous monitoring becomes possible, and given an ongoing campaign of monitoring, remaining strength can be estimated.

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Section: Introductionmentioning

confidence: 98%

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Kyriazopoulos

Anastasiadis

Triantis

et al. 2011

Construction and Building Materials

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“…see Scholz, 1990 There are several arguments pointing towards this field being dipole in nature (e.g. Slifkin, 1993;Molchanov andHayakawa, 1994, 1995;Vallianatos andTzanis, 1998, 1999). Thus, the possibility that some EEP signals are generated during crack propagation may also justify our assumption, that the direction of the electrical polarization vectors is consistent over the set of emitting sub-volumes.…”

Section: Discussionmentioning

confidence: 99%

On possible scaling laws between electric earthquake precursors (EEP) and earthquake magnitude

Vallianatos

Tzanis

1999

Geophysical Research Letters

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Abstract. We assume, without reference to any particular electrification mechanism, that a pre-seismic, time dependent polarization appears in a number of spherical volumes distributed in some earthquake preparation zone embedded in a half space of constant resistivity. We estimate the resulting transient electric and magnetic fields in the quasi-static approximation. On assuming that the number of polarized spheres N is scaling with their radii l as Noc 1/l v, we show that at some dis-

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“…For basic facts on EMR and its application in structural geology and neotectonics, it is recommended to read the valuable works [1,2]. The most promising theories to explain the generation of EMR induced by brittle fracturing are (1) charge separation processes between or along the crack walls associated with micro-cracking [3,4], (2) crack-induced movement and reorientation of dislocations [5,6], and (3) the surface vibrational-wave model (SVW) [7,8]. The model (3) is able to explain the generation of EMR independent of the material, as well as the directional properties of the emitted electromagnetic waves, which are the main requirements of a source mechanism.…”

Section: Introductionmentioning

confidence: 99%

Active Structures in Central Upper Rhine Graben, SW Germany: New Data from Landau Area using Electromagnetic Radiation (EMR) Technique and Cerescope

Hagag¹,

Obermeyer²

2017

J Geol Geophys

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Two conjugate sets of active faults oriented NNE-SSW and NNW-SSE have been detected at Landau area in SW Germany. These faults follow the old trends of the rift-related structures predominating in the Upper Rhine Graben (URG), which originated during Late Eocene-Miocene time. Linear and horizontal measurements were performed by using the Cerescope device and interpreted, applying the Electromagnetic Radiation (EMR) Technique. Linear EMRprofiles were helpful for mapping active faults, while the main horizontal stress (σ H , N to NNE) was easily identified with EMR-horizontal measurements. Reactivation of rift-related structures of the Upper Rhine Graben at Landau area produces a new system of active shallow fractures following old trends, and has been detected through the present study by Cerescope applying the EMR-Technique. The present results imply that the Enhanced Geothermal System (EGS) to the south of Landau has a great impact on reactivation of the pre-existing rift-related faults by mechanical hydro-fracturing occurring within the reservoir rocks underneath the area.

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Seismic electric signals from displacement of charged dislocations

Cited by 82 publications

References 5 publications

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

On possible scaling laws between electric earthquake precursors (EEP) and earthquake magnitude

Active Structures in Central Upper Rhine Graben, SW Germany: New Data from Landau Area using Electromagnetic Radiation (EMR) Technique and Cerescope

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